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prof. Ing. Ivo Doležel, CSc.

Všechny publikace

Inverse technique for determining temperature dependence of material properties

  • DOI: 10.1108/COMPEL-05-2016-0227
  • Odkaz: https://doi.org/10.1108/COMPEL-05-2016-0227
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Purpose - This paper aims to present a methodology of finding temperature dependencies of selected physical parameters of metals. The method is based on the combination of measurement of the surface temperature of material during the process of heating and subsequent solution of the inverse problem using multi-parametric optimization.

Numerical modeling of hybrid laser welding taking into account phase change of material

  • DOI: 10.1108/COMPEL-05-2016-0225
  • Odkaz: https://doi.org/10.1108/COMPEL-05-2016-0225
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Purpose - This paper aims to present a three-dimensional (3D) model of hybrid laser welding of a steel plate. Before welding, the plate is pre-and/or post-heated by induction to avoid mechanical stresses in material due to high gradients of temperature. Welding itself is realized by laser beam without welding rod. The model takes into account existence of both solid and liquid phases in the weld.

Combined heat treatment of metal materials

  • DOI: 10.1108/COMPEL-08-2015-0302
  • Odkaz: https://doi.org/10.1108/COMPEL-08-2015-0302
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Purpose - The purpose of this paper is to propose and analyze a combined heat treatment of metal materials, consisting in classic induction pre-heating and/or post-heating and full heating by laser beam. This technology is prospective for some kinds of surface hardening and welding because its application leads to lowering of temperature gradients at the heated spots, which substantially reduces local residual mechanical strains and stresses.

Advanced Model of Electromagnetic Launcher

  • Autoři: Leubner, K., Laga, R., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: Advances in Electrical and Electronic Engineering. 2015, 13(3), 223-229. ISSN 1336-1376.
  • Rok: 2015
  • DOI: 10.15598/aeee.v13i3.1419
  • Odkaz: https://doi.org/10.15598/aeee.v13i3.1419
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    An advanced 2D model of electromagnetic launcher is presented respecting the influence of eddy currents induced in the accelerated ferromagnetic body. The time evolution of electromagnetic field in the system, corresponding forces acting on the projectile and time evolutions of its velocity and current in the field circuit are solved numerically using own application Agros2d. The results are then processed and evaluated in Wolfram Mathematica. The methodology is illustrated with an example whose results are discussed.

Combined Heat Treatment of Metal Materials

  • Autoři: Kotlan, V., Hamar, R., Pánek, D., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: Proceedings of XVIII International Symposium on Theoretical Electrical Engineering. Szczecin: West Pomeranian University of Technology, 2015. ISBN 978-83-7663-196-7.
  • Rok: 2015
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    A combined heat treatment of metal materials is proposed and analyzed, consisting in classic induction pre-heating and/or post-heating and full heating by laser beam. This technology is prospective for some kinds of surface hardening and welding because its application leads to lowering of temperature gradients at the heated spots, which substantially reduces local residual mechanical strains and stresses. The paper presents fully 3D nonlinear and nonstationary mathematical model of the task, its numerical solution and a typical example whose results are verified by experiment.

Model of magnetic gun with respecting eddy currents

  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    A sophisticated mathematical model of the magnetic gun is presented and solved numerically. The model consists of three strongly non-linear and non-stationary differential equations describing the time-dependent distribution of magnetic field in the device, current in the field circuit and movement of the projectile. The numerical solution is carried out in the application Agros2D based on a fully adaptive higher-order finite element method. The results are processed in Wolfram Mathematica. The methodology is illustrated by an example and selected results are compared with experiment.

Model of thermal clamping of high-speed machine tools based on novel way of induction heating

  • Autoři: Kotlan, V., Koudela, L., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: Proceedings of the 41st Annual Conference of the IEEE Industrial Electronics Society (IECON2015). Tokyo: Institute of Electrical Engineers Japan, 2015. pp. 2556-2561. ISSN 1553-572X. ISBN 978-1-4799-1762-4.
  • Rok: 2015
  • DOI: 10.1109/IECON.2015.7392487
  • Odkaz: https://doi.org/10.1109/IECON.2015.7392487
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Thermal clamping of high-speed machine tools is modeled. The process is based on induction heating of rotating clamping head in static magnetic field produced by suitably arranged permanent magnets fixed in magnetic circuit. The mathematical model of the process consists of three mutually coupled partial differential equations that are solved numerically in the monolithic formulation. All important material nonlinearities are taken into account. Selected results are verified experimentally on a laboratory model of the device.

Numerical model of laser welding with induction pre- and/or postheating and its experimental verification

  • Autoři: Kotlan, V., Pánek, D., Hamar, R., prof. Ing. Ivo Doležel, CSc., Němeček, S.
  • Publikace: Proceedings of the XVII International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering (ISEF 2015). Valencia: Universidad Politécnica de Valencia, 2015. ISBN 978-84-606-9102-0.
  • Rok: 2015
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The laser welding with induction pre-heating and post-heating is modeled. This combined heat treatment is used in order to reduce high temperature gradients in the surface layers of the processed material characteristic for heating by the sole laser beam, and, consequently, the mechanical strains and stresses of thermal origin. The algorithm is used for the solution of a typical example ? welding of two massive plates. Selected results are verified experimentally.

Optimization of Inductor for Pre-Heating Material before its Laser Welding

  • Autoři: Pánek, D., Kotlan, V., Hamar, R., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: Proceedings of XVIII International Symposium on Theoretical Electrical Engineering. Szczecin: West Pomeranian University of Technology, 2015. ISBN 978-83-7663-196-7.
  • Rok: 2015
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The shape of an inductor for pre-heating metal parts is optimized with the aim to reach the prescribed distribution of temperature along the place to be consequently welded by laser beam. The task represents a nonlinear inverse multi-parametric problem that is solved for a given range of field current frequencies. While the direct part of the problem is solved by a fully adaptive higher-order finite element method, the inverse part is solved using selected genetic algorithms. Tested is also the influence of frequency of the field current. The methodology is illustrated by a typical example.

3D model of laser hardening of steel bodies with induction pre-heating

  • Autoři: Hamar, R., Kotlan, V., Pánek, D., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: 9th IET International Conference on Computation in Electromagnetics. Stevenage, Herts: The Institution of Engineering and Technology (IET), 2014. ISBN 978-1-84919-817-2.
  • Rok: 2014
  • DOI: 10.1049/cp.2014.0204
  • Odkaz: https://doi.org/10.1049/cp.2014.0204
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The paper suggests and solves a 3D model of laser hardening of steel bodies combined with their induction pre-heating. The model consists of two partial differential equations describing the distribution of a nonlinear and nonstationary magnetic field in the system and a nonstationary temperature field in the heated object. Both equations are solved numerically in the hard-coupled formulation, respecting the temperature dependences of the material parameters. The methodology is illustrated with a typical example.

3D Modeling of Induction Hardening of Gear Wheels

  • Autoři: Barglik, J., Smalcerz, A., Przylucki, R., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: Journal of Computational and Applied Mathematics. 2014, 270 231-240. ISSN 0377-0427.
  • Rok: 2014
  • DOI: 10.1016/j.cam.2014.01.019
  • Odkaz: https://doi.org/10.1016/j.cam.2014.01.019
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Induction hardening of gear wheels is modeled. The model consists of two nonlinear partial differential equations describing the distributions of magnetic and temperature fields in the system. All material parameters are supposed to be functions of temperature. The model is then solved numerically in the 3D hard-coupled formulation using the professional code FLUX3D supplemented with a number of own scripts and procedures. The methodology is illustrated with a typical example whose results are discussed.

3D Multiphysics Numerical Analysis and Design of Electromagnetic Devices with Soft Magnetic Materials

  • Autoři: Pantelyat, M.G., prof. Ing. Ivo Doležel, CSc., Smalcerz, A.
  • Publikace: Proc. XXIII Symposium Electromagnetics Phenomena in Nonlinear Circuits. Pilsen: University of West Bohemia, 2014. pp. 89-90. ISBN 978-80-261-0350-9.
  • Rok: 2014
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Multiphysics nonlinear analysis of selected devices from the area of low-frequency electrical engineering in 3D formulation is performed. Problem definitions, finite element numerical techniques and obtained numerical results are presented and discussed in detail. The methodology is illustrated with two examples.

Computation of Forces in Strongly Nonlinear Magnetic Fields Using Higher-Order Eggshell Algorithm

  • Autoři: Karban, P., Korous, L., Mach, F., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: 14th International Symposium Topical Problems in the Field of Electrical and Power Engineering. Ekaterinburg: Ural University Publisher, 2014. pp. 145-148.
  • Rok: 2014
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    A novel version of the eggshell-based procedure for numerical computation of magnetic forces and torques acting on ferromagnetic bodies in highly nonlinear magnetic fields is presented. The procedure works with a fully adaptive higher-order finite element method developed for years in our research group, that is implemented in own code Agros2D and library Hermes. The power of the methodology and both codes is demonstrated on the solution of two typical examples: computation of the static characteristic of a magnetic actuator and torque characteristic of a flux-switched permanent-magnet machine. The results obtained are compared with data calculated by several other available codes.

Design of Joint between Disk and Shaft Based on Induction Shrink Fit

  • Autoři: prof. Ing. Ivo Doležel, CSc., Kotlan, V., Ulrych, B.
  • Publikace: Journal of Computational and Applied Mathematics. 2014, 270 52-62. ISSN 0377-0427.
  • Rok: 2014
  • DOI: 10.1016/j.cam.2014.02.023
  • Odkaz: https://doi.org/10.1016/j.cam.2014.02.023
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The problem of fixing a disk on shaft by means of induction shrink fit is analyzed. The analysis consists of two principal parts. The first task is to propose an appropriate interference of the shaft and check the von Mises stress in the disk and shaft in acceptable operation regimes. The second task is to map the process of induction heating of the disk before its putting on the shaft (which represents a nonlinear and nonstationary coupled problem that is solved numerically, in the hard-coupled formulation). The methodology is illustrated with an example of the active wheel of a gas turbine whose results are discussed.

Electromagnetic Launcher of Ferromagnetic Bodies

  • Autoři: Leubner, K., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: Proceedings of ELEN 2014. Praha: ČVUT FEL, Katedra elektroenergetiky, 2014. ISBN 978-80-01-05654-7.
  • Rok: 2014
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    An advanced 2D model of electromagnetic launcher is presented respecting the influence of eddy currents induced in the accelerated ferromagnetic body. The time evolution of electromagnetic field in the system, corresponding forces acting on the projectile and time evolutions of its velocity and current in the field circuit are solved numerically using own application Agros2d. The results are then processed in Wolfram Mathematica 7. The methodology is illustrated by a typical example whose results are discussed.

Finite-Element 2-D Model of Induction Heating of Rotating Billets in System of Permanent Magnets and its Experimental Verification

  • Autoři: Mach, F., Štarman, V., Karban, P., prof. Ing. Ivo Doležel, CSc., Kůs, P.
  • Publikace: IEEE Transactions on Industrial Electronics. 2014, 61(5), 2584-2591. ISSN 0278-0046.
  • Rok: 2014
  • DOI: 10.1109/TIE.2013.2276025
  • Odkaz: https://doi.org/10.1109/TIE.2013.2276025
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    An alternative way of induction heating of nonmagnetic cylindrical billets is modeled. The billet rotates in static magnetic field generated by permanent magnets. The mathematical model of the process consisting of two second-order partial differential equations describing the distributions of magnetic and temperature fields is solved numerically in the quasi-coupled formulation. The computations are carried out by a fully adaptive higher order finite-element method that is implemented in own codes Agros2D and library Hermes. The most important results are verified experimentally on a prototype device built in our laboratory.

Induction Heating of Rotating Cylindrical Nonmagnetic Billets with Prescribed Temperature Profile

  • Autoři: Slobodník, K., Mach, F., Karban, P., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: Proc. of 40th Annual Conference of the IEEE Industrial Electronic Society. Piscataway: IEEE, 2014. p. 3233-3239. ISSN 1553-572X. ISBN 978-1-4799-4032-5.
  • Rok: 2014
  • DOI: 10.1109/IECON.2014.7048974
  • Odkaz: https://doi.org/10.1109/IECON.2014.7048974
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    A new way of induction heating of cylindrical non-magnetic billets is modelled and experimentally verified. This technology, among others, makes it possible to obtain a required temperature profile of the heated billet along its length. The billet is heated by rotation in a stationary magnetic field produced by high-parameter permanent magnets. The magnets are fixed on long arms made of ferromagnetic steel and the distance between the billet and arms can vary in the axial direction. The paper presents the continuous mathematical model of the problem, its numerical solution and verification of selected results by measurements.

Induction Heating of Rotating Nonmagnetic Billet in Magnetic Field Produced by High-Parameter Permanent Magnets

  • Autoři: prof. Ing. Ivo Doležel, CSc., Karban, P., Mach, F.
  • Publikace: Electrical Engineering & Electromechanics. 2014,(2), 32-36. ISSN 2074-272X.
  • Rok: 2014
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    An advanced way of induction heating of nonmagnetic billets is discussed and modeled. The billet rotates in a stationary magnetic field produced by unmoving high-parameter permanent magnets fixed on magnetic circuit of an appropriate shape. The mathematical model of the problem consisting of two coupled partial differential equations is solved numerically, in the monolithic formulation. Computations are carried out using our own code Agros2D based on a fully adaptive higher-order finite element method. The most important results are verified experimentally on our own laboratory device.

Monolithic Model of Induction Shrink Fit for High-Speed Tools

  • Autoři: Koudela, L., Kotlan, V., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: Proc. 5th Symposium on Applied Electromagnetics 2014. Skopje: Cyril and Methodius University, 2014. pp. 27-28. ISBN 978-9989-630-72-9.
  • Rok: 2014
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Axisymmetric induction clamping of high-speed machine tools is proposed and modeled. The model consists of three nonlinear partial differential equations (PDEs) describing the distribution of magnetic field, temperature field and field of thermoelastic displacements in the domain. Their coefficients containing the physical parameters of the materials used are functions of temperature. The system is solved numerically in the monolithic formulation using own code Agros2D based on a fully adaptive higher-order finite element method. The methodology is illustrated with an example of fixing the shank of a high-revolution drilling tool in the clamping head. The results are evaluated and discussed.

Shape Optimization of Cylindrical Inductor for Induction Pre-Heating

  • Autoři: Pánek, D., prof. Ing. Ivo Doležel, CSc., Kotlan, V.
  • Publikace: Proc. Applications of Electromagnetism in Novel Technologies and Medicine 2014. Warszawa: Polish Community of Applied Electromagnetism, 2014. pp. 157-159. ISBN 83-88131-99-0.
  • Rok: 2014
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The shape of a device for induction pre-heating of steel bodies is optimized in order to obtain its best performance. The goal is to maximize heat delivered to the place of the body that will be post-heated by laser beam, while heat produced elsewhere should be minimized. The direct problem (hard-coupled analysis of magnetic and temperature fields in the system) is solved by the finite element method. The inverse problem is solved using a special genetic algorithm with some elements of NSGA II. The methodology is illustrated by a typical example.

Shape optimization of inductors for preheating before laser welding and hardening

  • Autoři: Pánek, D., Kůs, P., Kotlan, V., Hamar, R., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: Engineering Optimization 2014. Leiden: CRC Press/Balkema, 2014. p. 693-698. ISBN 978-1-138-02725-1.
  • Rok: 2014
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    An auxiliary pre-heating inductor for laser edge welding is optimized with respect to two prescribed criteria. The first one is to reach the maximum possible temperature along the edge before the laser processing whose purpose is to prevent the surface layers of material from high temperature gradients during the heating by laser beam, which would lead to excessive residual mechanical stresses. The second one is to minimize the mass of the inductor in order to disburden the robotic hand that maintains the whole heating system. The task represents a strongly non-linear and non-stationary inverse problem. Its direct part (modeling of the continuous induction heating) is solved numerically in the monolithic formulation, while the inverse part (optimization) is processed using specific genetic algorithms. The computations are carried out by our own software. The methodology is illustrated by an example whose results are discussed.

3D modeling of induction heating of teeth wheels

  • Autoři: Barglik, J., Smalcerz, A., Przylucki, R., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: ISTET 2013. Plzeň: ZČU Plzeň, 2013. ISBN 978-80-261-0246-5.
  • Rok: 2013
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Induction hardening of teeth wheels is modeled. The model consists of two nonlinear partial differential equations describing the distributions of magnetic and temperature fields in the sys-tem. All material parameters are supposed to be functions of the temperature. The model is then solved numerically in the hard-coupled formulation using the professional code FLUX3D. The methodology is illustrated with a typical example whose results are discussed.

Advanced adaptive algorithms in 2D finite element method of higher order of accuracy

  • DOI: 10.1108/03321641311305782
  • Odkaz: https://doi.org/10.1108/03321641311305782
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The paper presents the principal elements of automatic adaptivity built in our 2D software for monolithic solution of multiphysics problems based on a fully adaptive finite element method of higher order of accuracy. The adaptive techniques are illustrated with appropriate examples.

Induction heating in magnetic fields produced by permanent magnets

  • Autoři: prof. Ing. Ivo Doležel, CSc., Musálek, L., Doubek, J.
  • Publikace: Elektroenergetika 2013. Košice: Technical University of Kosice, 2013. pp. 327-330. ISBN 978-80-553-1442-6.
  • Rok: 2013
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Induction heating of nonmagnetic cylindrical billets in magnetic field produced by permanent magnets is analyzed. The continuous mathematical model of the problem is given by two partial differential equations describing the distribution of magnetic and temperature fields. The model in the hard-coupled formulation is then solved numerically by a fully adaptive higher-order finite element method. The technique is illustrated by an example whose results are discussed.

Induction heating of cylindrical billets in magnetic field produced by permanent magnets: Simulation and experiments Indukcyjne nagrzewanie cylindrycznych ke{ogonek}sów w polu magnesów trwał

  • Autoři: prof. Ing. Ivo Doležel, CSc., Musálek, L., Mach, F., Karban, P.
  • Publikace: Przeglad Elektrotechniczny. 2013, 89(3 A), 250-252. ISSN 0033-2097.
  • Rok: 2013
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    A complete overview of results is presented concerning induction heating of nonmagnetic cylindrical billets in magnetic field produced by permanent magnets. The authors proposed and modelled two possible ways of the process. The billet either rotates inside a system of appropriately arranged static permanent magnets or a ring containing such magnets rotates around an unmoving billet. Both arrangements were modelled numerically using fully adaptive higher-order finite element method and some results were verified by experiments on a physical model built in our lab.

Load-bearing actuator with permanent magnet for transport of rails Siłownik nośny z magnesami trwałymi to transportu szyn

  • Autoři: prof. Ing. Ivo Doležel, CSc., Škopek, M., Ulrych, B.
  • Publikace: Przeglad Elektrotechniczny. 2013, 89(2 B), 32-34. ISSN 0033-2097.
  • Rok: 2013
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    A new solution for transporting long ferromagnetic bodies is presented, based on a system of permanent magnets whose attractive force at the moment of releasing the load is reduced by pulse magnetic field produced by appropriately arranged coils. The continuous mathematical model of the device is solved numerically. Its operation characteristics illustrated by an example are evaluated and discussed.

Mathematical model of laser hardening

  • Autoři: prof. Ing. Ivo Doležel, CSc., Kotlan, V., Pánek, D.
  • Publikace: XXIII Sympozjum Srodowiskowe PTZE. Ksiaz: Polish Society of Electromagnetism, 2013. pp. 78-80. ISBN 83-88131-99-0.
  • Rok: 2013
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The paper deals with the modeling of laser hardening of steel bodies. Its goal is to map the time evolution of the temperature field produced by a laser beam moving along the wall of the work-piece. The methodology is illustrated with a typical example.

Modeling of triboelectric separation of plastic particles in electric field

  • Autoři: Mach, F., Kůs, P., Karban, P., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: Computer Applications in Electrical Engineering. Poznaň: Poznan University of Technology, 2013. pp. 107-117. ISSN 1508-4248. ISBN 978-83-7775-232-6.
  • Rok: 2013
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    A device for electrostatic separation of triboelectrically charged plastic particles is modelled and optimized. Electric field in the system is solved numerically by a fully adaptive higher-order finite element method. The movement of particles in the device is determined by means of an adaptive Runge-Kutta-Fehlberg method. The shape optimization of the electrodes is carried out using a technique based on higher-order conjugate gradients. The methodology is illustrated by a typical example.

Modelling of Contactless Induction Melting Systems

  • Autoři: Barglik, J., prof. Ing. Ivo Doležel, CSc., Doubek, J., Labaj, J., Musálek, L., Szmagór, A., Smalcerz, A.
  • Publikace: Spanish-Portuguese Conference on Electrical Engineering 2013. Valencia: University of Valencia, 2013. ISBN 978-84-695-7778-3.
  • Rok: 2013
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Two basic contactless induction melting techniques are modelled. The first one is based on using a cold crucible while the second one consists in melting in levitation. Both of them are suitable for heat treatment of strongly reactive metals. From the physical viewpoint, both processes are characterized by a strong interaction of magnetic, temperature and flow fields. The paper presents their continuous mathematical models whose parts are solved by a fully adaptive higher-order finite element method. The methodology is illustrated by two examples whose results are discussed.

Numerical modelling of cylindrical induction shrink fits

  • DOI: 10.1007/s00607-012-0274-0
  • Odkaz: https://doi.org/10.1007/s00607-012-0274-0
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    A complete model of a cylindrical induction shrink fit between the disk and shaft is presented. The model consists of two independent parts. The first part is aimed at the purely mechanical aspects of the shrink fit (determination of the interference between both parts necessary for transferring the prescribed torque and reduced stress in both parts for the assumed range of revolutions of the system). The second part maps the process of induction heating of the disk before its setting on the shaft. The methodology is then used for an analysis of a typical example whose results are discussed.

Optimized control of field current in thermoelastic actuator for accurate setting of position

  • Autoři: prof. Ing. Ivo Doležel, CSc., Karban, P., Kropík, P., Kotlan, V., Pánek, D.
  • Publikace: Applied Mathematics and Computation. 2013, 219(13), 7187-7193. ISSN 0096-3003.
  • Rok: 2013
  • DOI: 10.1016/j.amc.2011.06.008
  • Odkaz: https://doi.org/10.1016/j.amc.2011.06.008
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    A novel device for control of position working with accuracies on the order of 10^5–10^3 m is proposed. The device has no movable parts. It works with an inductively heated metal cylindrical element of appropriate dimensions, whose longitudinal dilatation of thermoelastic origin is controlled by the harmonic field current in the inductor. The principal aim of the paper is to find such a time evolution of the field current that allows reaching the required dilatation in the shortest time possible.

Proposal of induction shrink fit between disk and shaft

  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    A complete proposal of induction shrink fit between a disk and shaft is presented. The proposal consists of two parts. First, a suitable interference between both parts has to be suggested that is be able to transfer the required mechanical torque at a permissible mechanical stress. Then, the process of induction heating of the disk before its putting on the shaft is mapped. The model of the process respecting all nonlinearities is solved numerically in the hard-coupled formulation. The methodology is illustrated by the example of induction shrink fit between the active wheel of gas turbine and shaft.

Separation of plastic particles in electrostatic field produced by electrodes of optimized shape

  • Autoři: Mach, F., Kůs, P., Karban, P., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: Communications. 2013, 15(2A), 40-45. ISSN 1335-4205.
  • Rok: 2013
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Shape optimization of electrodes for the device for electrostatic separation of triboelectrically charged plastic particles is carried out. The objective function maximizes the efficiency of sepa-ration consisting in the highest possible number of particles falling down to the prescribed bins. Electric field in the system is solved numerically, using the fully adaptive higher-order finite element method. The movement of particles in the device influenced by the Coulomb force is determined by means of an adaptive Runge-Kutta-Fehlberg method with a time varying time step. The shape optimization is carried out using a technique based on genetic algorithms. The meth-odology is illustrated with an example whose results are discussed.

Static characteristics of pulsed actuator with combined plunger

  • Autoři: prof. Ing. Ivo Doležel, CSc., Pánek, D., Ulrych, B.
  • Publikace: Computer Applications in Electrical Engineering. Poznaň: Poznan University of Technology, 2013. pp. 127-136. ISSN 1508-4248. ISBN 978-83-7775-232-6.
  • Rok: 2013
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    A novel type of pulsed electromagnetic actuator is presented and modelled. Its plunger consists of two cylindrical parts made of classical magnetic material and permanent magnet, respectively. Its motion is controlled by short current pulses of the prescribed amplitude. The paper starts with the definition of the technical problem and formulation of its mathematical model. This model is then solved numerically and the whole methodology is illustrated by a typical example, whose results are discussed.

Contact Problem of Disk on Shaft Fixed by Induction Shrink Fit

  • Autoři: Ulrych, B., Kotlan, V., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: Proceedings of PTZE 2012. Sandomierz: Polish Society of Applied Electromagnetics, 2012. pp. 219-221. ISBN 83-88131-99-0.
  • Rok: 2012
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The problem of shrink fit between the disk and shaft is solved. The shrink fit realized by induction heating must transfer the prescribed torque and power. Both disk and shaft are considered elastic. The first step of the task is to find appropriate dimensions of the disk and interference. The second step is to suggest the parameters of its induction heating. The methodology is illustrated by a typical example.

Fixing element with permanent magnet for transport of rails

  • Autoři: prof. Ing. Ivo Doležel, CSc., Škopek, M., Ulrych, B., Voráček, L.
  • Publikace: Proceedings of 9th International Conference Elektro 2012. Žilina: Žilinská universita, Elektrotechnická fakulta, 2012. p. 411-414. ISBN 978-1-4673-1178-6.
  • Rok: 2012
  • DOI: 10.1109/ELEKTRO.2012.6225693
  • Odkaz: https://doi.org/10.1109/ELEKTRO.2012.6225693
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    A load-bearing transport element with permanent magnet for transport of rails is proposed. The element does not need any external source of energy and may be controlled by short current pulses delivered from an appropriate source fixed to the device. The paper presents the device and its mathematical model that is solved numerically. The results of an illustrative example are discussed.

Hard-Coupled Model of Local Direct Resistance Heating of Thin Sheets

  • Autoři: Karban, P., Mach, F., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: Journal of Computational and Applied Mathematics. 2012, 236(18), 4725-4731. ISSN 0377-0427.
  • Rok: 2012
  • DOI: 10.1016/j.cam.2012.02.036
  • Odkaz: https://doi.org/10.1016/j.cam.2012.02.036
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    A monolithic model of local direct resistance heating of thin sheets is presented. The model respects all nonlinearities of the system such as the temperature dependencies of physical properties of individual parts of the system. Numerical computations are performed by a finite element method of higher order of accuracy and realized by our own codes Hermes2D and Agros2D. The methodology is illustrated by a typical example whose results are discussed.

Hard-coupled nonlinear model of induction heating of nonmagnetic cylindrical billets in rotation

  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The purpose of this paper is to present a model of induction heating of aluminum billets rotating in a static magnetic field generated by permanent magnets. The model is solved by the authors' own software and the results are verified experimentally.

Induction Heating of Cylindrical Nonmagnetic Ingots by Rotation in Static Magnetic Field Generated by Permanent Magnets

  • Autoři: Mach, P., Karban, P., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: Journal of Computational and Applied Mathematics. 2012, 236(18), 4732-4744. ISSN 0377-0427.
  • Rok: 2012
  • DOI: 10.1016/j.cam.2012.02.035
  • Odkaz: https://doi.org/10.1016/j.cam.2012.02.035
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Induction heating of cylindrical nonmagnetic billets by their rotation in static magnetic field is modeled. The magnetic field is produced by a system of appropriately arranged permanent magnets. The numerical model is solved by our own full adaptive higher-order finite element method in a monolithic formulation, i.e., both magnetic and temperature fields are solved simultaneously, respecting their mutual interaction. All principal nonlinearities are included in the model (permeability of ferromagnetic parts of the system as well as temperature dependences of physical parameters of the heated metal). The methodology is illustrated by two examples whose results are discussed.

Load-Bearing Actuator with Permanent Magnet for Transport of Steel Rails

  • Autoři: prof. Ing. Ivo Doležel, CSc., Škopek, M., Ulrych, B., Voráček, L.
  • Publikace: Proceedings of 9th International Conference Elektro 2012. Žilina: Žilinská universita, Elektrotechnická fakulta, 2012. p. 411-414. ISBN 978-1-4673-1178-6.
  • Rok: 2012
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    A new solution for transporting long ferromagnetic bodies is presented, based on a system of permanent magnets whose attractive force at the moment of releasing the load is reduced by pulse magnetic field produced by appropriately arranged coils. The continuous mathematical model of the device is solved numerically. Its operation characteristics illustrated by an example are evaluated and discussed.

Numerical Model of Induction Shrink Fits in Monolithic Formulation

  • Autoři: Karban, P., Kotlan, V., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: IEEE Transactions on Magnetics. 2012, 48(2), 315-318. ISSN 0018-9464.
  • Rok: 2012
  • DOI: 10.1109/TMAG.2011.2175712
  • Odkaz: https://doi.org/10.1109/TMAG.2011.2175712
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Induction heating-based assembly of axisymmetric shrink fits is modeled. The task represents a triply coupled evolutionary problem characterized by mutual interaction of electromagnetic field, temperature field, and field of thermoelastic displacements. Its numerical solution is performed by a fully adaptive higher-order finite element method in monolithic formulation, using a code developed by the authors. All nonlinearities of the system (magnetic permeability and temperature dependencies of all material parameters) are respected. The methodology is illustrated by a typical example whose results are discussed.

Processing of Solid Metals Based on Thermal Effects of Electromagnetic Field and its Numerical Modeling

  • Autoři: Karban, P., Mach, F., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: Proceedings of SPETO 2012. Gliwice: University of Gliwice, 2012. pp. 1-8. ISBN 978-83-85940-34-0.
  • Rok: 2012
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    An overview of processes in solid metals based on thermal effects of electromagnetic field is presented. Summarized are the most widespread technologies in the domain and methods used for their numerical modeling. Evaluated are the existing algorithms and the authors presents their own techniques based on using fully adaptive higher-order finite element methods implemented into own computer codes Agros2D and Hermes2D. The methodology is illustrated by four different examples whose results are discussed.

Static and Dynamic Characteristics of Pulsed Actuator with Plunger Consisting of Iron Core and Permanent Magnet

  • Autoři: prof. Ing. Ivo Doležel, CSc., Pánek, D., Ulrych, B.
  • Publikace: Proceedings of ICEMS 2012. Tokyo: Institute of Electrical Engineers of Japan, 2012. pp. 1-6. ISBN 978-4-88686-077-4.
  • Rok: 2012
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Static and dynamic characteristics of a special pulsed actuator are investigated. Its plunger consists of two mutually separated parts, the first of them being made of magnetic steel, the second of permanent magnet. The device is controlled by short pulsed currents and exhibits high holding forces, while its consumption of energy is very low. Its static and dynamic operation characteristics are modeled numerically.

Active thermal insulation for induction heating of specific metal parts

  • Autoři: Ulrych, B., Kotlan, V., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: Proceedings of Advanced Methods in the Theory of Electrical Engineering (AMTEE´11). Plzeň: Západočeská univerzita v Plzni, 2011. pp. II-3-II-4. ISBN 978-80-7043-993-7.
  • Rok: 2011
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The concept of active thermal insulation is explained and its application for induction heating of specific metal parts is analyzed. Its features ale illustrated by a typical example whose results are discussed.

Actuator with Ferromagnetic Plunger Working in Ferrofluidic Liquid

  • Autoři: prof. Ing. Ivo Doležel, CSc., Polcar, P., Kropík, P.
  • Publikace: Proceedings of Advanced Methods in the Theory of Electrical Engineering (AMTEE´11). Plzeň: Západočeská univerzita v Plzni, 2011. pp. IV-1-IV-2. ISBN 978-80-7043-993-7.
  • Rok: 2011
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    An electromagnetic actuator with a plunger moving in a ferrofluidic liquid is suggested and modeled. The paper analyses its principal operation characteristics.

Actuator with permanent magnet controlled by very short current pulses

  • Autoři: prof. Ing. Ivo Doležel, CSc., Pánek, D., Ulrych, B.
  • Publikace: The 8th International Conference on Computation in Electromagnetics CEM 2011. Stevenage: IET Publishing Group, 2011. pp. 124-125. ISBN 978-1-84919-468-6.
  • Rok: 2011
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    A new type of electromagnetic actuator with high holding force and extremely low consumption of electric energy is proposed and modeled. The movement of its plunger formed by a permanent magnet is controlled by short pulses of direct current together with a return spring. The paper presents the arrangement of the device and analyses its principal operation characteristics.

Adaptivity techniques in hp-finite element method

  • Autoři: Karban, P., prof. Ing. Ivo Doležel, CSc., Šolín, P.
  • Publikace: Proceedings of Advanced Methods in the Theory of Electrical Engineering (AMTEE´11). Plzeň: Západočeská univerzita v Plzni, 2011. pp. I-1-I-2. ISBN 978-80-7043-993-7.
  • Rok: 2011
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Sophisticated methods of automatic adaptivity in finite element methods of higher order of accuracy are presented. The main attention is devoted to hp-adaptivity techniques that exhibit the highest level of flexibility and exponential convergence of results.

Advanced Adaptive Algorithms in Finite Element Method of Higher Order of Accuracy

  • Autoři: prof. Ing. Ivo Doležel, CSc., Karban, P., Mach, F., Ulrych, B.
  • Publikace: Sixteenth International Symposium on Theoretical Electrical Engineering -- ISTET'11. Klagenfurt: University of Klagenfurt, 2011. pp. 128-131. ISBN 978-1-4577-0760-5.
  • Rok: 2011
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Sophisticated methods of automatic adaptivity in finite ele-ment methods of higher order of accuracy are presented. The main attention is devoted to hp-adaptivity techniques that exhibit the highest level of flexibility and exponential convergence of results. The technologies implemented in our own FEM code are illustrated by three typical examples.

Automatic Adaptivity in Higher-Order Finite Element Method

  • Autoři: Karban, P., Mach, F., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: Automatic Adaptivity in Higher-Order Finite Element Method. Silesian University of Technology, 2011. pp. 131-132. ISBN 978-83-85940-33-3.
  • Rok: 2011
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Problems of automatic adaptivity in finite element methods of higher orders of accuracy are discussed. Compared are its particular possibilities, advantages and disadvantages. Particular attention is paid to hp-adaptivity that exhibits the highest level of flexibility and extremely fast convergence. The theoretical aspects are illustrated by a benchmark example solved numerically by our own codes Hermes2D and Agros2D for solving physical fields.

Combined Actuator for Accurate Setting of Position Based on Thermoelasticity Produced by Induction Heating

  • Autoři: prof. Ing. Ivo Doležel, CSc., Ulrych, B., Kotlan, V.
  • Publikace: IEEE Transactions on Industry Applications. 2011, 47(5), 2250-2256. ISSN 0093-9994.
  • Rok: 2011
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    A novel possibility of accurate control of position is proposed, based on the thermoelastic effect. This paper presents the relevant device together with its complete mathematical model and methodology of its numerical solution. The theoretical analysis is supplemented with the description of the basic operation characteristics of the device.

Design and modeling of simple magnetohydrodynamic pumps for transport of molten metals and salts

  • Autoři: Ulrych, B., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: Proceedings of APEET 2011 (Topical Problems of Power Electrical Technologies). Yekaterinburg: University of Yekaterinburg, 2011. pp. 165-170.
  • Rok: 2011
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The paper is devoted to the investigation of possibilities of MHD pumps with permanent magnets for transport of mol-ten metals.

Electromagnetic friction clutch for fixing accurate position of sliding elements

  • Autoři: prof. Ing. Ivo Doležel, CSc., Kotlan, V., Ulrych, B.
  • Publikace: Proceedings of 17th Scientific Conference COMPUTER APPLICATIONS IN ELECTRICAL ENGINEERING ZKwE'2011. Poznan: Institute of Electrical Engineering and Electronics of the PUT, 2011. pp. 165-166. ISBN 978-83-89333-39-1.
  • Rok: 2011
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    A complete mathematical model of an electromagnetic fric-tion clutch is presented, whose numerical solution provides its basic operation characteristics. The clutch represents a part of various devices working with the movable plunger and its purpose is to fix it in a prescribed accurate position. Its analysis is illustrated on an example of a combined electromagnetic-thermoelastic actuator.

Electromagnetic-thermoelastic actuator for accurate wide-range setting of position

  • Autoři: prof. Ing. Ivo Doležel, CSc., Kotlan, V., Ulrych, B.
  • Publikace: Przeglad Elektrotechniczny. 2011, 87(5), 22-27. ISSN 0033-2097.
  • Rok: 2011
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    A novel actuator for accurate setting of position is presented, allowing a wide-range shift. While the rougher setting of position is realized electromagnetically, its fine tuning is performed on the principle of thermoelastic dilatation of the nonferromagnetic part of the plunger. The complete mathematical model of the problem (representing a triply coupled task) is solved numerically. The methodology is illustrated by an example whose results are discussed.

Hard-Coupled Model of Induction Heating of Cylindrical Nonmagnetic Billets Rotating in System of Permanent Magnets

  • Autoři: Karban, P., Mach, F., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: Przeglad Elektrotechniczny. 2011, 87(12b), 78-81. ISSN 0033-2097.
  • Rok: 2011
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    A new technology of induction heating of nonmagnetic cylindrical billets by their rotation in static magnetic field produced by a system of permanent magnets is presented and modeled. Analyzed is effectiveness of the process (particularly the time necessary for reaching a prescribed average temperature) in the dependence of the arrangement of the permanent magnets. The methodology is illustrated by a typical example.

Hard-coupled model of local direct resistance heating of thin sheets

  • Autoři: Karban, P., Mach, F., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: Proceedings of the 12th International Scientific Conference Electric Power Engineering 2011. Ostrava: Vysoká škola báňská - Technická univerzita Ostrava, 2011. pp. 1-4. ISBN 978-80-248-2393-5.
  • Rok: 2011
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    A monolithic model of local direct resistance heating of thin sheets is presented. The model respects all nonlinearities of the system such as the temperature dependencies of physical properties of individual parts of the system. Numerical computations are performed by a finite element method of higher order of accuracy and realized by our own codes Hermes2D and Agros2D. The methodology is illustrated by a typical example whose results are discussed.

Hard-Coupled Modeling of Induction Shrink Fit of Gas-Turbine Active Wheel

  • Autoři: Kotlan, V., Karban, P., Ulrych, B., prof. Ing. Ivo Doležel, CSc., Kůs, P.
  • Publikace: Sixteenth International Symposium on Theoretical Electrical Engineering -- ISTET'11. Klagenfurt: University of Klagenfurt, 2011. pp. 173-178. ISBN 978-1-4577-0760-5.
  • Rok: 2011
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Hard-coupled model of induction heating of a ferromag-netic disk is presented. The problem is described by three coupled partial differential equations (for the distribution of electromagnetic field, temperature field and field of thermoelastic displacements) whose coefficients are temperature-dependent functions. The system is solved numerically in the monolithic formulation by a fully adaptive finite element method of higher order of accuracy implemented into own codes Hermes and Agros. The methodology is illustrated by a typical example - heating of an active wheel of a high-speed gas turbine that is to be hot-pressed on a shaft with the aim of obtaining a shrink fit. The results are evaluated and discussed.

Hard-Coupled Nonlinear Model of Induction Heating of Nonmagnetic Cylindrical Billets In Rotation

  • Autoři: Karban, P., Mach, F., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: XV International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering, ISEF2011. Funchal: Associaçao Portuguesa para a Promoçao e Desenvolvimento da Engenharia El., 2011. pp. 1-8. ISBN 978-972-8822-24-8.
  • Rok: 2011
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    A hard-coupled model of induction heating of cylindrical billets rotating in invariable magnetic field produced by permanent magnets is presented. The mathematical model of the process consisting of two partial differential equations is solved numerically in a monolithic formulation. The computations are carried out by a fully adaptive higher-order finite element method using our own codes Hermes and Agros. All nonlinearities (the temperature dependencies of various material parameters) are respected. The methodology is illustrated by two examples whose results are discussed.

Hard-Coupled Numerical Model of Induction Heating of Thin Profile Plates in External Magnetic Field

  • Autoři: prof. Ing. Ivo Doležel, CSc., Ulrych, B., Barglik, J.
  • Publikace: Proceedings of COMPUMAG 2011. Florianopolis: International Compumag Society, 2011. pp. 1.
  • Rok: 2011
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    A new hard-coupled numerical model of induction heating of thin profile plates in external time-variable magnetic field is presented. While the currents induced in the plate are expressed in terms of electric vector T-potential, the distribution of temperature in it is described by the heat-transfer equation involving the effects of heat sources and sinks. All nonlinearities of the system are taken into account. The methodology is illustrated by an example of heating of an axisymmetric plate spring made of phosphor bronze.

Higher-order finite element modeling of rotational induction heating of nonferromagnetic cylindrical billets

  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The purpose of this paper is to present a methodology of high-precision finite element modeling of induction heating of rotating nonferromagnetic cylindrical billets in static magnetic field produced by appropriately arranged permanent magnets.

Higher-Order Finite Element Modeling with Curvilinear Elements

  • Autoři: Karban, P., Mach, F., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: Automatic Adaptivity in Higher-Order Finite Element Method. Silesian University of Technology, 2011. pp. 5-6. ISBN 978-83-85940-33-3.
  • Rok: 2011
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Application of curvilinear elements in finite element methods is presented and discussed. It is shown that intro-duction of such elements in domains with curvilinear boundaries leads to substantial reduction of the number of degrees of freedom of the task compared with classical triangular or quadrangular elements, while the accuracy of results is even better. Their usage is illustrated by a typical example solved by a higher-order finite element method implemented in own codes Hermes2D and Agros2D.

Induction Heating of a Ferromagnetic Disk in Transverse and Longitudinal Magnetic Fields

  • Autoři: prof. Ing. Ivo Doležel, CSc., Kotlan, V., Ulrych, B.
  • Publikace: Proceedings of the 6th International Scientific Symposium on Electrical Power Engineering. Košice: Technická univerzita v Košiciach, 2011. pp. 153-156. ISBN 978-80-553-0724-4.
  • Rok: 2011
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    A comparison of induction heating of a ferromagnetic disk in transverse and longitudinal magnetic fields is presented. The aim of the paper is to decide which way of heating is more convenient from the viewpoint of the heating time. The numerical model of the problem is solved in the quasi-coupled formulation (both magnetic and temperature fields are calculated using a single stiffness matrix, the field of displacements is solved additionally). The most significant material nonlinearities and temperature dependencies are taken into account. The results are compared and discussed.

Induction Heating of Very Thin Metal Plates Modelled by Electric Vector Potential

  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    A novel way of modeling of induction heating of very thin nonferromagnetic plates exposed by periodically varying magnetic flux is presented. The currents induced in the plate are described by means of the T-electric vector potential. The mathematical model is solved numerically, by a code developed and written by the authors. The methodology is illustrated with an example whose results are discussed.

Magnetohydrodynamic pumps for molten salts in cooling loops of high-temperature nuclear reactors

  • Autoři: prof. Ing. Ivo Doležel, CSc., Kotlan, V., Ulrych, B.
  • Publikace: Przeglad Elektrotechniczny. 2011, 87(5), 28-33. ISSN 0033-2097.
  • Rok: 2011
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Possibilities of using the magnetohydrodynamic (MHD) effect for pumping molten salts in cooling loops of high-temperature nuclear reactors are analyzed. Two basic ways of producing magnetic field in the pump (saddle coils and permanent magnets) are evaluated with respect to the total Lorentz force and resultant pumping head of the device. The corresponding mathematical models are solved numerically.

Modeling of Induction Shrink Fit of Action Wheel in Gas Turbine

  • Autoři: prof. Ing. Ivo Doležel, CSc., Kotlan, V., Ulrych, B.
  • Publikace: Proceedings of 12th Portuguese-Spanish Conference on Electrical Engineering, XIICLEEE. Funchal: Associaçao Portuguesa para a Promoçao e Desenvolvimento da Engenharia El., 2011. pp. 1-6. ISBN 978-972-8822-23-1.
  • Rok: 2011
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Induction shrink fit in a gas turbine is modeled. The fit is realized by pressing of the heated steel disk carrying the blades on shaft and its purpose is transferring a relatively high torque in specific operation conditions. The paper deals with its computer modeling, which represents nu-merical solution of a nonlinear and nonstationary coupled problem characterized by interaction of magnetic field, temperature field and field of thermoelastic dis-placements. Computations are carried out using a com-bination of commercial and own codes. The methodology is illustrated by a typical example.

Modeling of simultaneous induction hardening in monolithic formulation

  • Autoři: Karban, P., prof. Ing. Ivo Doležel, CSc., Ulrych, B.
  • Publikace: Computational Methods for Coupled Problems in Science and Engineering IV. Barcelona: International Center for Numerical Methods in Engineering (CIMNE), 2011. pp. 1169-1175. ISBN 978-84-89925-78-6.
  • Rok: 2011
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Induction hardening of an axisymmetric steel workpiece is modeled. This evolutionary and highly nonlinear process is solved by a fully adaptive higher-order finite element method. Numerical computations are realized in the monolithic formulation, using own code Hermes. All nonlinear dependencies of material properties on temperature are re-spected. The methodology is illustrated by a typical example whose results are discussed.

Monolithic Model of a Thermoelastic Friction Clutch with Permanent Magnets

  • Autoři: Kotlan, V., Karban, P., prof. Ing. Ivo Doležel, CSc., Ulrych, B.
  • Publikace: XV International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering, ISEF2011. Funchal: Associaçao Portuguesa para a Promoçao e Desenvolvimento da Engenharia El., 2011. pp. 1-8. ISBN 978-972-8822-24-8.
  • Rok: 2011
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    A novel thermoelastic friction clutch is proposed and mod-eled. The friction force between the driving and driven parts is produced by a mechanical stress brought about by thermoelastic dilatation of the internal element that rotates in magnetic field generated by two sets of segmental permanent magnets arranged in the internal and external rings. From the physical viewpoint the task represents a highly nonlinear triply coupled problem characterized by the interaction of magnetic field, temperature field and field of thermoelastic displacements. Its numerical computation in a monolithic formulation is carried out by own code base on a fully adaptive finite element method of higher order of accuracy. The methodology is illustrated by an example whose results are discussed.

Monolithic model of continuous induction hardening of a steel mandrel

  • Autoři: Karban, P., prof. Ing. Ivo Doležel, CSc., Barglik, J., Ulrych, B.
  • Publikace: The 8th International Conference on Computation in Electromagnetics CEM 2011. Stevenage: IET Publishing Group, 2011. pp. 122-123. ISBN 978-1-84919-468-6.
  • Rok: 2011
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Continuous induction hardening of axi-symmetric steel bo-dies is analyzed. The mathematical model of the process (consisting of two coupled partial differential equations describing the distributions of magnetic and temperature fields) is solved numerically by a fully adaptive higher-order finite element method in the monolithic formulation. All important nonlinearities of the system (magnetic permeability and other material parameters) are respected. The methodology is illustrated by a typical example whose results are discussed.

Monolithic Model of Induction Heating of Thin Conductive Plate with Respecting Thermoelasticity

  • Autoři: prof. Ing. Ivo Doležel, CSc., Kropík, P., Ulrych, B.
  • Publikace: Przeglad Elektrotechniczny. 2011, 87(12b), 29-32. ISSN 0033-2097.
  • Rok: 2011
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    A new approach to modeling of induction heating of thin plates is presented. The model of magnetic field is based on the electric vector potential T and the distribution of temperature is described by a modified equation including heat sources and sinks. The thermoelastic displacements are also respected. The methodology is illustrated by an example whose results are discussed.

Novel Fully Adaptive Higher-order Finite Element Method for Monolithic Solution of Coupled Problems in Electroengineering

  • Autoři: prof. Ing. Ivo Doležel, CSc., Karban, P., Kotlan, V., Šolín, P., Ulrych, B.
  • Publikace: Proceedings of EDPE 2011. Košice: TUKE, Fakulta elektrotechniky a informatiky, Katedra počítačov a informatiky, 2011. pp. 1-10. ISBN 978-80-553-0734-3.
  • Rok: 2011
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    New fully adaptive higher-order finite element method is presented for monolithic solution of coupled problems rooting in electrical engineering. Special attention is paid to the sophisticated adaptive techniques that the authors implemented to their own codes Hermes and Agros. Their application is illustrated by several examples whose results are discussed.

Numerical model of induction shrink fits in monolithic formulation

  • Autoři: Karban, P., Kotlan, V., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: Proceedings of COMPUMAG 2011. Florianopolis: International Compumag Society, 2011. pp. 1.
  • Rok: 2011
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Induction heating-based assembly and disassembly of axi-symmetric shrink fits is modeled. The task represents a tri-ply coupled evolutionary problem characterized by mutual interaction of electromagnetic field, temperature field, and field of thermoelastic displacements. Its numerical solution is performed by a fully adaptive higher-order finite element method in monolithic formulation, using a code developed by the authors. All nonlinearities of the system (magnetic permeability and temperature dependencies of all material parameters) are respected. The methodology is illustrated by a typical example whose results are discussed.

Numerical simulation of electrical engineering devices: Magneto-thermo-mechanical coupling

  • Autoři: Pantelyat, M., Shulzhenko, M., Matyukhin, Y., Gontarowskiy, P., prof. Ing. Ivo Doležel, CSc., Ulrych, B.
  • Publikace: COMPEL. 2011, 30(4), 1189-1204. ISSN 0332-1649.
  • Rok: 2011
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The paper seeks to present a methodology of computer simulation of coupled magneto-thermo-mechanical processes in various electrical engineering devices. The methodology allows determining their parameters, characteristics and behavior in various operation regimes.

Precise Electromagnetic-Thermoelastic Actuator for Laser Technologies

  • Autoři: prof. Ing. Ivo Doležel, CSc., Kotlan, V., Ulrych, B.
  • Publikace: Computational Methods for Coupled Problems in Science and Engineering IV. Barcelona: International Center for Numerical Methods in Engineering (CIMNE), 2011. pp. 388-397. ISBN 978-84-89925-78-6.
  • Rok: 2011
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    A new type of a combined electromagnetic-thermoelastic actuator is presented. The device is intended for accurate setting of position. Its mathematical model represents a nonlinear coupled problem characterized by the interaction of electromagnetic field, temperature field and field of thermoelastic displacements. Its numerical solution is illustrated on a typical example whose results are discussed.

Pulsed actuator with permanent magnet and its dynamic characteristics

  • Autoři: prof. Ing. Ivo Doležel, CSc., Pánek, D., Ulrych, B.
  • Publikace: Proceedings of ICEMS 2011. Beijing: China Electrotechnical Society (CES), 2011. pp. 1-4. ISBN 978-1-4577-1044-5.
  • Rok: 2011
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    A special pulsed electromagnetic actuator is presented with the plunger containing a permanent magnet. The actuator exhibits a high holding force and small consumption of energy (and negligible thermal losses). The movement of the plunger is controlled by short current pulses. Dynamic characteristics and other operation properties of the actuator are modeled numerically.

T-potential based model of induction heating of thin conductive plates in hard-coupled formulation

  • Autoři: prof. Ing. Ivo Doležel, CSc., Ulrych, B., Kropik, P.
  • Publikace: Przeglad Elektrotechniczny. 2011, 87(3), 41-44. ISSN 0033-2097.
  • Rok: 2011
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Mathematical and computer models of induction heating of very thin plates are presented. The plate is supposed to be exposed by time variable external magnetic field. Distribution of eddy currents and other quantities is modeled in terms of electric vector potential. The problem is solved in hard-coupled formulation and the methodology is illustrated by a typical example.

Accurate Control of Position by Induction Heating-Produced Thermoelasticity

  • Autoři: prof. Ing. Ivo Doležel, CSc., Karban, P., Kropik, P., Danek, P.
  • Publikace: IEEE Transactions on Magnetics. 2010, 46(8), 2888-2891. ISSN 0018-9464.
  • Rok: 2010
  • DOI: 10.1109/TMAG.2010.2043826
  • Odkaz: https://doi.org/10.1109/TMAG.2010.2043826
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    An alternative possibility of highly accurate control of position is suggested, realized by a simple device with a cylindrical dilatation element that works on the principle of thermoelasticity produced by induction heating. The paper describes the device, presents its complete mathematical model in common with the methodology of its numerical solution, and also the algorithm of the control process. The theoretical analysis is illustrated by a typical example, whose results are discussed.

Adaptive hp-FEM with Arbitrary-Level Hanging Nodes for Maxwell's Equations

  • Autoři: Šolín, P., Dubcová, L., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: Advances in Applied Mathematics and Mechanics. 2010, 2(4), 518-532. ISSN 2070-0733.
  • Rok: 2010
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Adaptive higher-order finite element methods (hp-FEM) are well known for their potential of exceptionally fast (exponential) convergence. However, most hp-FEM codes remain in an academic setting due to an extreme algorithmic complexity of hp-adaptivity algorithms. This paper aims at simplifying hp-adaptivity for H(curl)-conforming approximations by presenting a novel technique of arbitrary-level hanging nodes. The technique is described and it is demonstrated numerically that it makes adaptive hp-FEM more efficient compared to hp-FEM on regular meshes and meshes with one-level hanging nodes.

Combined electromagnetic-thermoelastic actuator for accurate wide-range setting of position

  • Autoři: prof. Ing. Ivo Doležel, CSc., Kotlan, V., Ulrych, B.
  • Publikace: CPEE 2010. Pilsen: University of West Bohemia, 2010. pp. 3. ISBN 978-80-7043-899-2.
  • Rok: 2010
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    A novel actuator for accurate setting of position is presented, allowing a wide-range shift. While the rougher setting of position is realized electromagnetically, its fine tuning is performed on the principle of thermoelastic dilatation of the nonferromagnetic part of the plunger. The complete mathematical model of the problem (representing a triply coupled task) is solved numerically. The methodology is illustrated by an example whose results are discussed.

Controllable Thermoelastic Actuator with Mechanical Friction Clutches for Accurate Setting of Position

  • Autoři: prof. Ing. Ivo Doležel, CSc., Krónerová, E., Ulrych, B.
  • Publikace: Przeglad Elektrotechniczny. 2010, 86(1), 77-79. ISSN 0033-2097.
  • Rok: 2010
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Accurate setting of position based on thermoelastic effect produced by induction heating is suggested. Its controllability is reached by supplementary friction clutches that hold the dilatation element in the required position. The paper presents the arrangement of the device, its mathematical model and way of its numerical solution. The operation properties of the device are illustrated on an example whose results are discussed.

Higher-order finite element modeling of rotational induction heating of nonferromagnetic cylindrical billets

  • Autoři: Karban, P., Mach, F., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: HES 2010. Padova: University of Padova, 2010. pp. 515-522. ISBN 978-88-89884-13-3.
  • Rok: 2010
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Rotational heating of nonmagnetic billets in uniform magnetic field is modeled using a novel and powerful numerical approach based on the fully adaptive higher-order finite element method. The magnetic field is generated by permanent magnets or direct current carrying coils of the same cross sections and the results are compared. Some of them are validated by experiment.

Incompressible flow of electrically conductive medium in time-variable magnetic field solved in hard-coupled formulation

  • Autoři: Dubcová, L., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: PTZE 2010. Ksiaz: Polish Society of Electromagnetism, 2010. pp. 35-38. ISBN 83-88131-99-0.
  • Rok: 2010
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Incompressible flow of electrically conductive medium driven by time-variable magnetic field in an axisymmetric channel is modeled. Numerical solution of the model is carried out by a higher- order finite element method in the monolithic formulation. The methodology is illustrated by a typical example and the computations were performed by our own code Hermes.

Incompressible Flow of Electrically Conductive Medium in Time-Variable Magnetic Field Solved in Monolithic Formulation

  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Incompressible flow of electrically conductive medium driven by time-variable magnetic field in an axisymmetric channel is modeled. Numerical solution of the model is carried out by a higher-order finite element method in the monolithic formulation. The methodology is illustrated by a typical example and the computations were performed by our own code Hermes.

Induction heating of nommagnetic cylindrical billets by rotation in magnetic field produced by unmoving permanent magnets

  • Autoři: Karban, P., Mach, F., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: PTZE 2010. Ksiaz: Polish Society of Electromagnetism, 2010. pp. 61-64. ISBN 83-88131-99-0.
  • Rok: 2010
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Induction heating of nonmagnetic cylindrical billets by rotation in magnetic field produced by static permanent magnets is modeled. Numerical analysis of the process is carried out in the hard-coupled formulation, using own code based on higher-order finite element method. The methodology is illustrated by a typical example and the most important results are validated by an experiment.

Induction heating of thin metal plates in time-Varying external magnetic field solved as nonlinear hard-coupled problem

  • Autoři: prof. Ing. Ivo Doležel, CSc., Kropik, B., Ulrych, B.
  • Publikace: ESCO 2010 Book of Abstracts. Pilsen: University of West Bohemia, 2010. pp. 60. ISBN 978-80-7043-898-5.
  • Rok: 2010
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    A novel mathematical model of local induction heating of very thin metal plates in an external time-variable magnetic field is suggested. Distribution of eddy currents induced in the plate is modelled by electric vector T -potential and thermal fluxes in the systems are expressed in terms of heat sources and sinks. Analysed are also the thermoelastic displacements in the plate, their back influence on the discretization mesh and distribution of the electromagnetic and thermal quantities. Numerical solution of the problem is carried out in the hard-coupled formulation. The methodology is illustrated by a typical example whose results are discussed.

Inductively Heated Incompressible Flow of Electrically Conductive Liquid in Pipe

  • Autoři: prof. Ing. Ivo Doležel, CSc., Dubcová, L., Karban, P., Červený, J., Šolín, P.
  • Publikace: IEEE Transactions on Magnetics. 2010, 46(8), 2899-2902. ISSN 0018-9464.
  • Rok: 2010
  • DOI: 10.1109/TMAG.2010.2044488
  • Odkaz: https://doi.org/10.1109/TMAG.2010.2044488
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    A novel computer model of inductively heated incompressible flow of electrically conductive liquid in a pipe is presented. The numerical solution of this multiply coupled problem is realized by a higher-order finite element method using the code Hermes2D developed and written by the authors. The algorithm contains a number of original features such as hanging nodes of any order or in time adaptively changing mutually independent meshes for the computation of particular time-dependent field quantities. The methodology is illustrated by a typical example whose results are discussed.

Magnetohydrodynamic pumps for molten salts in cooling loops of high-temperature nuclear reactors

  • Autoři: prof. Ing. Ivo Doležel, CSc., Ulrych, B.
  • Publikace: CPEE 2010. Pilsen: University of West Bohemia, 2010. pp. 7. ISBN 978-80-7043-899-2.
  • Rok: 2010
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Possibilities of using the magnetohydrodynamic (MHD) effect for pumping molten salts in cooling loops of high-temperature nuclear reactors are analyzed. Two basic ways of producing magnetic field in the pump (saddle coils and permanent magnets) are evaluated with respect to the total Lorentz force and resultant pumping head of the device. The corresponding mathematical models are solved numerically.

Magnetohydrodynamic Pumps with Permanent Magnets for Pumping Molten Metals or Salts

  • Autoři: prof. Ing. Ivo Doležel, CSc., Kotlan, V., Ulrych, B., Valenta, V.
  • Publikace: Przeglad Elektrotechniczny. 2010, 86(1), 86-88. ISSN 0033-2097.
  • Rok: 2010
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Possibilities of pumping molten metals and salts (as cooling agents in nuclear reactors) by magnetohydrodynamic (MHD) pumps with permanent magnets are investigated. The principal attention is paid to the steady-state movement of these quenchants in the closed cooling loops described by the balance of the Lorentz force produced by the pump and hydrodynamic drag forces. The methodology is illustrated on two typical examples whose results are discussed.

Modeling of Volumetric Joule losses in Very thin plates using analogy between magnetic and electric vector potentials

  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Distribution of volumetric Joule losses in very thin nonferromagnetic plates exposed by periodically varying magnetic flux is modeled. The currents induced inside the plate are described by means of the electric vector potential. The mathematical model is solved by numerically, by own code. The methodology is illustrated by one example whose results are discussed.

Optimized regulation of field current in thermoelastic actuator for accurate setting of position

  • Autoři: prof. Ing. Ivo Doležel, CSc., Karban, P., Kropík, P., Kotlan, V., Pánek, D.
  • Publikace: ESCO 2010 Book of Abstracts. Pilsen: University of West Bohemia, 2010. pp. 57. ISBN 978-80-7043-898-5.
  • Rok: 2010
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    A novel device for control of position working with accuracies on the order of 10E-5 - 10E-3 m is proposed. The device has no movable parts. It works with an inductively heated metal cylindrical element of appropriate dimensions, whose longitudinal dilatation of thermoelastic origin is controlled by the harmonic field current in the inductor. The principal aim of the paper is to find such a time evolution of the field current that allows reaching the required dilatation in the shortest time possible.

Study of suitable arrangement of axial electromagnetic clutch

  • Autoři: prof. Ing. Ivo Doležel, CSc., Kotlan, V., Ulrych, B.
  • Publikace: ZKwE 2010. Poznaň: Poznan University of Technology, 2010. pp. 155-156. ISBN 978-83-89333-34-6.
  • Rok: 2010
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    A methodology of designing axial magnetic clutch is presented. Except for the prescribed force, the clutch must satisfy requirements concerning its temperature rise and several other aspects.

Study of Suitable Arrangement of Axial Electromagnetic Clutch

  • Autoři: prof. Ing. Ivo Doležel, CSc., Kotlan, V., Ulrych, B.
  • Publikace: Computer Applications in Electrical Engineering. Wroclaw: Polish Academy of Sciences, 2010. p. 141-149. ISBN 978-83-923978-9-2.
  • Rok: 2010
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    A methodology of designing axial magnetic clutch is presented. Except for the prescribed force, the clutch must satisfy certain requirements concerning its temperature rise and several other aspects. The methodology is illustrated by two examples.

T-potential based solution of induction heating and thermoelastic displacements of thin conductive plates in hard-coupled formulation

  • Autoři: prof. Ing. Ivo Doležel, CSc., Kropik, P., Ulrych, B.
  • Publikace: IGTE 2010. Graz: Technische Universitat Graz, 2010. pp. 118. ISBN 978-3-85125-133-3.
  • Rok: 2010
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Induction heating of thin electrically conductive plates exposed by time-variable external magnetic field is investigated. Distribution of currents induced in the plate is modeled by electric vector T-potential. All considered physical phenomena (induction heating and thermoelastic displacements of the plate) are described and solved in the hard-coupled formulation.

Thermal aspects of levitation heating of nonferromagnetic metal bodies in axisymmetric arrangements

  • Autoři: Kolář, D., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: SPETO 2010. Ustron: Instytut Elektrotechniki Teoretycznej I Przemyslowej Politechniki Slaskiej, 2010. pp. 17-18. ISBN 978-83-85940-32-6.
  • Rok: 2010
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Levitation heating with respect to selected thermal aspects is investigated, particularly the dependence of the time of heating on voefficients characterizing convection and radiation. The methodology is illustrated by an example.

Thermoelastic actuator for accurate Setting of position

  • Autoři: Kotlan, V., Barglik, J., Ulrych, B., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: HES 2010. Padova: University of Padova, 2010. pp. 100-104. ISBN 978-88-89884-13-3.
  • Rok: 2010
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    A novel possibility of accurate control of position is proposed, based on the thermoelastic effect. The paper presents the relevant device (a thermoelastic actuator) together with the complete mathematical model and methodology of its numerical solution. The theoretical analysis is supplemented with the investigation of the basic operation regimes of the device and an illustrative example.

Thermoelasticity-based control of position and its application in laser technologies

  • Autoři: prof. Ing. Ivo Doležel, CSc., Kotlan, P., Ulrych, B.
  • Publikace: Proceedings of the 14th EPE-PEMC Conference 2010. Skopje: International Council on Large Electric Systems Macedonian National Commitee, 2010. pp. 1-6. ISBN 978-1-4244-7854-5.
  • Rok: 2010
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    An alternative possibility of accurate control of position is presented. Its principle consists in thermoelastic effect produced by induction heating. The authors describe the proposed device, solve its mathematical model and discuss its operation properties. Its application is illustrated on an example of laser technology - cutting of very thin groves.

Accurate Control of Position by Induction Heating-Produced Thermoelasticity

  • Autoři: prof. Ing. Ivo Doležel, CSc., Karban, P., Kropík, P., Pánek, D.
  • Publikace: 17th International Conference on the Computation of Elec-tromagnetics Field COMPUMAG 2009. Florianopolis: International Compumag Society, 2009. p. 1-7.
  • Rok: 2009
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    An alternative possibility of highly accurate control of position is suggested, realized by a simple device with a cylindrical dilatation element that works on the principle of thermoelasticity produced by induction heating. The paper describes the device, presents its complete mathematical model in common with the methodology of its numerical solution, and also the algorithm of the control process. The theoretical analysis is illustrated by a typical example, whose results are discussed.

Combined Actuator for Accurate Setting of Position Based on Thermoelasticity Produced by Induction Heating

  • Autoři: prof. Ing. Ivo Doležel, CSc., Kronerová, E., Ulrych, B., Kotlan, V.
  • Publikace: The International Conference on Electrical Machines and Systems (ICEMS 2009). Tokyo: Institute of Electrical Engineers Japan, 2009. pp. 1-6. ISBN 978-1-4244-5177-7.
  • Rok: 2009
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    A novel possibility of accurate control of position is proposed, based on the thermoelastic effect. The paper presents the relevant device together with the complete mathematical model and meth-odology of its numerical solution. The theoretical analysis is sup-plemented with the investigation of the basic operation character-istics of the device.

Control of Position by Thermoelasticity

  • Autoři: Kropik, P., Pánek, D., Karban, P., prof. Ing. Ivo Doležel, CSc., Barglik, J.
  • Publikace: XV International Symposium on Theoretical Electrical Engineering ISTET 2009. Berlin: VDE VERLAG GMBH Berlin, 2009. p. 1-4. ISSN 0932-6022. ISBN 978-3-8007-3166-4.
  • Rok: 2009
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    A novel methodology of controlling position by thermoelasticity is presented. A dilatation element is inductively heated by alter-nating current, which leads to its stretching. After reaching the dilatation required, the Joule losses in the system must be reduced on the value corresponding to the total loss of heat. The task represents a triply coupled problem combined with optimization of the time evolution of the field current whose amplitude must vary in time appropriately. The methodology is illustrated by a typical example.

Controllable Thermoelastic Actuator with Mechanical Fric-tion Clutches for Accurate Setting of Position

  • Autoři: prof. Ing. Ivo Doležel, CSc., Kronerová, E., Ulrych, B.
  • Publikace: 10th International Workshop "Computational Problems of Electrical Engineering". Warsaw University of Technology, 2009. pp. 1-6.
  • Rok: 2009
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Accurate setting of position based on thermoelastic effect pro-duced by induction heating is suggested. Its controllability is reached by supplementary friction clutches that hold the dilata-tion element in the required position. The paper presents the ar-rangement of the device, its mathematical model and way of its numerical solution. The operation properties of the device are illustrated on an example whose results are discussed.

Coupled electromagneto-thermo-mechanical analysis of selected electrical and electromechanical devices

  • Autoři: Pantelyat, M. G., Shulzhenko, M. G., Matyukhin, I. Y., Gontarowskiy, P. P., prof. Ing. Ivo Doležel, CSc., Ulrych, B.
  • Publikace: Acta Technica CSAV. 2009, 54(3), 292-323. ISSN 0001-7043.
  • Rok: 2009
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    A coupled approach to numerical analysis of selected electrical and electromechanical devices (induction heaters, specific types of actuators, rotating electrical machines, and some others) is presented providing complete information about their electromagneto-thermo-mechanical behavior in various operation conditions. The corresponding mathematical models (nonlinear and often nonstationary) are mostly solved by the finite element method using both classical and newly developed algorithms. The methodology is illustrated by several examples whose results are discussed.

Efficient Arrangement of Field Coils for Rotational Induction Heating of Nonmagnetic Cylindrical Billets

  • Autoři: Donátová, M., Karban, P., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: 10th International Workshop "Computational Problems of Electrical Engineering". Warsaw University of Technology, 2009. pp. 1-7.
  • Rok: 2009
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Induction heating of nonmagnetic cylindrical billets rotating in uniform magnetic field before their hot forming belongs to mod-ern industrial technologies characterised by higher efficiency than classical ways of heating. The paper presents an integrodifferen-tial model of the process. The suggested algorithm of calculation is illustrated by an example whose results are discussed.

Flow of molten metal in a pipe driven by electromagnetic field

  • Autoři: Červený, J., Dubcova, L., prof. Ing. Ivo Doležel, CSc., Karban, P., Barglik, J.
  • Publikace: 11th Spanish Portuguese Conference On Electrical Engineer-ing (11CHLIE). Vigo: Universidad de Vigo, 2009. pp. 1-7. ISBN 84-613-2234-3.
  • Rok: 2009
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The force effects of electromagnetic fields are used in numerous industrial technologies. One of the domains of their application is heat treatment of molten metals and other electrically conductive liquids. The paper is aimed at modeling electromagnetically driven flow of molten metal in the channel of a hydrostatic pump. The problem represents a complicated triply coupled problem involving mutual interactions of the electromagnetic field, tem-perature field and field of flow. The authors present the complete mathematical model of the process and their own way of its nu-merical solution based on using the adaptive hp-finite element method (hp-FEM). The methodology is illustrated on an example whose results are discussed.

Generation of Small Controlled Shifts by Thermoelasicity

  • Autoři: prof. Ing. Ivo Doležel, CSc., Karban, P., Ulrych, B.
  • Publikace: The Proceedings of SPETO'09. Gliwice: Silesian Technical University, 2009. pp. 52-54. ISBN 978-83-85940-31-9.
  • Rok: 2009
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The paper represents an introduction study in the domain of accu-rate setting of position based on thermoelasticity. Its aim is to find the basic properties of the process (its static and dynamics characteristics).

Higher-Order Finite Element Modeling of Electromagnetical-ly Driven Flow of Molten Metal in Pipe

  • Autoři: Červený, J., prof. Ing. Ivo Doležel, CSc., Dubcova, L., Karban, P., Šolín, P.
  • Publikace: The International Conference on Electrical Machines and Systems (ICEMS 2009). Tokyo: Institute of Electrical Engineers Japan, 2009. pp. 1-7. ISBN 978-1-4244-5177-7.
  • Rok: 2009
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Electromagnetically driven flow of incompressible molten metal in a ceramic pipe is modeled. The mathematical model of this multiply coupled problem is solved by the higher-order finite element method (hp-FEM) using the code Hermes developed and written by the authors. The methodology and capabilities of the code are illustrated by a typical example whose results are dis-cussed.

Induction heating of cylindrical billets by rotation in uniform magnetic field solved as mechanical transient

  • Autoři: Donátová, M., Karban, P., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: 11th Spanish Portuguese Conference On Electrical Engineer-ing (11CHLIE). Vigo: Universidad de Vigo, 2009. pp. 1-4. ISBN 84-613-2234-3.
  • Rok: 2009
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Induction heating of long cylindrical nonmagnetic billets rotating in uniform magnetic field belongs to progressive techniques of heat treatment of solid metals. The paper presents the complete mathematical model of the process consisting of an integrodiffer-ential equation describing the distribution of eddy current densi-ties in the system, partial differential equation describing the time evolution of temperature field, and a strongly nonlinear ordinary differential equation characterizing the time evolution of rotation. The model is then solved numerically by a combined technique developed by the authors. The theoretical analysis is illustrated on an example whose results are discussed.

Induction Thermoelastic Actuator with Controllable Opera-tion Regime

  • Autoři: prof. Ing. Ivo Doležel, CSc., Kronerová, E., Ulrych, B.
  • Publikace: XV. International Symposium on Electromagnetic Fields (ISEF 2009). Artois: L'Université d'Artois, 2009. pp. 1-7. ISBN 978-2-84832-115-8.
  • Rok: 2009
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    A thermoelastic actuator with the possibility of extremely small controllable shifts is presented and analyzed. Its mathematical model consisting of three partial differential equations is solved numerically. The application of the device is illustrated on the technology of cutting metal plates by the laser beam.

Inductively Heated Incompressible Flow of Electrically Con-ductive Liquid in Pipe

  • Autoři: prof. Ing. Ivo Doležel, CSc., Dubcova, L., Karban, P., Červený, J., Šolín, P.
  • Publikace: 17th International Conference on the Computation of Elec-tromagnetics Field COMPUMAG 2009. Florianopolis: International Compumag Society, 2009. pp. 1-7.
  • Rok: 2009
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    A novel computer model of inductively heated incompressible flow of electrically conductive liquid in a pipe is presented. The numerical solution of this multiply coupled problem is realized by a higher-order finite element method using the code Hermes2D developed and written by the authors. The algorithm contains a number of original features such as hanging nodes of any order or in time adaptively changing mutually independent meshes for the computation of particular time-dependent field quantities. The methodology is illustrated by a typical example whose results are discussed.

Integral methods in low-frequency electromagnetics

  • Autoři: prof. Ing. Ivo Doležel, CSc., Karban, P., Šolín, P.
  • Publikace: Hoboken, NJ: Wiley-InterScience, 2009. ISBN 978-0-470-19550-5.
  • Rok: 2009
  • DOI: 10.1002/9780470502730
  • Odkaz: https://doi.org/10.1002/9780470502730
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The book is aimed at the development and application of integral and integrodifferential methods in low-frequency electromagnetism. It includes an overview of existing analytical and numerical methods, basic ideas of low-order integral methods and fundamentals of the high-order methods. Mentioned is also the boundary element method and other similar algorithms. All techniques are illustrated by a number of examples including several coupled problems that are solved numerically.

Integral Model of Induction Heating of Rotating Bodies with Respecting Mechanical Transient

  • Autoři: Karban, P., Donátová, M., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: International Interdisciplinary PhD Workshop I2PhDW2009. Warsaw: Electrotechnical Institute Warsaw, 2009. pp. 1-5.
  • Rok: 2009
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Combination of the integrodifferential and finite element methods is used for modeling of heating rotating bodies by induction. The mechanical transient is taken into account. The methodology is illustrated by a typical example whose results are discussed.

Integrodifferential model of induction heating of nonmagnetic cylindrical billet rotating in uniform magnetic field

  • Autoři: Donátová, M., Karban, P., prof. Ing. Ivo Doležel, CSc., Ulrych, B.
  • Publikace: Przeglad Elektrotechniczny. 2009, 85(4), 16-18. ISSN 0033-2097.
  • Rok: 2009
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Induction heating of nonmagnetic cylindrical billets rotating in uniform magnetic field before their hot forming belongs to modern industrial technologies characterized by higher efficiency than classical ways of heating. The paper presents an integrodifferential model of the process. The suggested algorithm of calculation is illustrated by an example whose results are discussed.

Integrodifferential model of pulse current in long massive nonferromagnetic cylindrical conductor

  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    A novel approach to determining of the spatial and temporal distribution of current density in massive electrically conductive nonferromagnetic bodies is suggested. The approach is based on the integrodifferential method of higher order of accuracy. Presented is the basic continuous mathematical model of the problem and possibilities of its numerical processing. The methodology is illustrated by an example of the distribution of pulse current density in a massive cylindrical conductor.

Magnetohydrodynamic Pumps with Permanent Magnets for Pumping Molten Metals or Salts

  • Autoři: prof. Ing. Ivo Doležel, CSc., Kotlan, V., Ulrych, B., Valenta, V.
  • Publikace: 10th International Workshop "Computational Problems of Electrical Engineering". Warsaw University of Technology, 2009. pp. 1-6.
  • Rok: 2009
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Possibilities of pumping molten metals and salts (as cooling agents in nuclear reactors) by magnetohydrodynamic (MHD) pumps with permanent magnets are investigated. The principal attention is paid to the steady-state movement of these quenchants in the closed cooling loops described by the balance of the Lor-entz force produced by the pump and hydrodynamic drag forces. The methodology is illustrated on two typical examples whose results are discussed.

MHD Pumps of Molten Metals - Innovation of Cooling Loops of High-Temperature Nuclear Reactors

  • Autoři: prof. Ing. Ivo Doležel, CSc., Ulrych, B., Valenta, V.
  • Publikace: Electric Power Engineering 2009. Ostrava: VŠB, 2009. p. 393-398. ISBN 978-80-248-1947-1.
  • Rok: 2009
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Possible exchange of classical mechanical pumps used in cooling loops of nuclear reactors by pumps working on the magnetohyd-rodynamic (MHD) principle is investigated. Operation of the MHD pumps is analyzed in two types of newly built nuclear reactors. The results are evaluated and discussed.

Modeling of Radiation Heat Transfer in Indirect Heating Process

  • Autoři: Barglik, J., prof. Ing. Ivo Doležel, CSc., Przylucki, R., Ulrych, B.
  • Publikace: MEASUREMENT 2009 - Proceedings of the 7th International Conference on Measurement. Bratislava: Institute of Measurement Science, 2009. pp. 1-4. ISBN 978-80-969672-1-6.
  • Rok: 2009
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Correct evaluation of radiation in modeling of indirect or induction heating process is discussed. A newly offered approach introduces so called generalized convection and experimentally-numerical determination of its coefficient. The suggested algorithm is illustrated by typical example.

Numerical Field Simulation in Electrical Engineering De-vices: Magneto-Thermo-Mechanical Coupling

  • Autoři: Pantelyat, M., Shulzhenko, M., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: XV International Symposium on Theoretical Electrical Engineering ISTET 2009. Berlin: VDE VERLAG GMBH Berlin, 2009. p. 236-240. ISSN 0932-6022. ISBN 978-3-8007-3166-4.
  • Rok: 2009
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The paper is devoted to computer simulation of coupled magneto-thermo-mechanical processes in various electrical engineering devices (induction heaters, actuators, rotating electrical machines, etc.). The goal of the numerical analysis is to recommend their rational operation conditions and design. The paper presents mathematical models, numerical techniques and algorithms for finite element analysis of coupled nonlinear problems solution. A lot of numerical results describing solution of real-life problems of practical interest are presented and analyzed.

Optimal Distribution of Field Coils for Rotational Induction Heating of Cylindrical Workpiece

  • Autoři: Donátová, M., Karban, P., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: Proceedings of the 5th International Scientific Symposium on Electric Power Engineering ELEKTROENERGETIKA 2009. Košice: TU Košice, FEI, 2009. p. 63-68. ISBN 978-80-553-0401-4.
  • Rok: 2009
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Induction heating of cylindrical billets by their rotation in uni-form magnetic field seems to be a prospective technology charac-terized by higher efficiency than heating in static systems. The paper deals with numerical modeling of the process with the aim to find the optimal distribution of the field coils under the condi-tion of the same magnetomotive force. Magnetic field in the sys-tem (together with the distribution of the volume Joule losses and drag torque) is determined by the method of integrodifferential equations developed and programmed by the authors. The tem-perature field is calculated by the classical finite element method. The mechanical transient accompanying the startup of rotation is also taken into account. The methodology is illustrated on a typi-cal example whose results are discussed.

Pumps of molten metal based on magnetohydrodynamic principle for cooling high-temperature nuclear reactors

  • Autoři: prof. Ing. Ivo Doležel, CSc., Donátová, M., Karban, P., Ulrych, B.
  • Publikace: Przeglad Elektrotechniczny. 2009, 85(4), 13-15. ISSN 0033-2097.
  • Rok: 2009
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Pumps of molten metals based on magnetohydrodynamic principle represent an advantageous alternative to classical rotational pumps used for cooling of some types of nuclear reactors. The paper deals with the mathematical and computer modeling of their operation. The theoretical analysis is illustrated by an example whose results are discussed.

Static Characteristics of Components of Controllable Ther-moelastic Actuator

  • Autoři: prof. Ing. Ivo Doležel, CSc., Kotlan, V., Ulrych, B.
  • Publikace: Advanced Methods of the Theory of Electrical Engineering. Plzeň: Západočeská universita, 2009. pp. 1-6. ISBN 978-80-7043-821-3.
  • Rok: 2009
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The paper deals with one of the basic conditions of practical em-ployment of finely controllable thermoelastic actuators - prob-lems of the static characteristics of its individual structural parts. It contains the formulation of the principle of such thermoelastic actuators, description of its components (a dilatation element heated by induction, auxiliary electromagnetic actuators, and self-locking friction clutches) and their mathematical models. Briefly discussed are also their corresponding computer models making use of the finite element method. The crucial point of the work consists in the presentation of the results - static characteristics of the considered structural parts of the controlled thermoelastic actuators.

Study of Integral Arrangement of MHD Pumps Transporting Molten Metal or Salts

  • Autoři: Kotlan, V., prof. Ing. Ivo Doležel, CSc., Ulrych, B.
  • Publikace: Advanced Methods of the Theory of Electrical Engineering. Plzeň: Západočeská universita, 2009. pp. 1-6. ISBN 978-80-7043-821-3.
  • Rok: 2009
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The paper deals with one of the fundamental possibilities of im-proving magnetohydrodynamic (MHD) pumps based on the inte-gration of effects of elementary MHD minipumps distributed along the pipe through which they transport the considered liquid. The crucial point of the work consists in computer modeling of this integral arrangement (system of minipumps) and presentation of the results that demonstrate their advantages-reduction of elec-tric currents flowing through the minipumps and consequent re-duction of the total ohmic losses in the system.

Study of Suitable Arrangement of Magnetic Circuit with Permanent Magnets for Realization of Magnetocaloric Effect

  • Autoři: Ota, J., prof. Ing. Ivo Doležel, CSc., Ulrych, B.
  • Publikace: The Proceedings of SPETO'09. Gliwice: Silesian Technical University, 2009. pp. 49-50. ISBN 978-83-85940-31-9.
  • Rok: 2009
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The magnetocaloric effect becomes a principle of various prospective technologies. One of them is magnetic cooling, that is a way of cooling without any negative accompanying aspects (depletion of the ozone layer, etc.). The paper deals with the generation of magnetic field in the domain where the magnetocaloric effect is realized. Evaluations illustrate using possibilities of permanent magnets. The theoretical analysis is shown by an example whose results are discussed.

Study of Suitable Arrangement of Magnetic Circuits for Re-alization of Magnetocaloric Effect

  • Autoři: prof. Ing. Ivo Doležel, CSc., Ota, J., Ulrych, B.
  • Publikace: Advanced Methods of the Theory of Electrical Engineering. Plzeň: Západočeská universita, 2009. pp. 1-4. ISBN 978-80-7043-821-3.
  • Rok: 2009
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The paper is stimulated by one of very prospective physical do-mains - magnetic cooling based on the magnetocaloric effect. Successful realization of this effect requires a magnetic circuit with permanent magnets producing very strong and uniform magnetic field and the paper deals with arrangements of such circuits. Its crucial point consists in the presentation and conse-quent discussion of the results that allow estimating the suitability of the considered magnetic circuits.

Study of suitable arrangement of magnetohydrodynamic pump with permanent magnets

  • Autoři: prof. Ing. Ivo Doležel, CSc., Kotlan, V., Ulrych, B.
  • Publikace: Transactions on Computer Applications in Electrical Engineering. Poznaň: Poznan University of Technology, 2009. pp. 25-30. ISBN 978-83-89333-24-7.
  • Rok: 2009
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Operation properties of magnetohydrodynamic (MHD) pumps of molten metals with permanent magnets are studied. Suggested are mathematical and computer models of the task that is solved nu-merically by the finite element method (FEM). The theoretical analysis is illustrated by an example whose results are discussed.

Suppression of Boundary Effect of Electric Field in MHD Device

  • Autoři: Donátová, M., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: International Interdisciplinary PhD Workshop I2PhDW2009. Warsaw: Electrotechnical Institute Warsaw, 2009. pp. 1-4.
  • Rok: 2009
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Distribution of current density in the working channel of magne-tohydrodynamic (MHD) pump is studied as a 3D problem in or-der to evaluate and suppress the undesirable boundary effects at the ends of the electrodes.

Using of Thermoelasticity Phenomenon for Precise Position Control

  • Autoři: Kropík, P., Pánek, D., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: Proceedings of the 5th International Scientific Symposium on Electric Power Engineering ELEKTROENERGETIKA 2009. Košice: TU Košice, FEI, 2009. pp. 391-394. ISBN 978-80-553-0401-4.
  • Rok: 2009
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The paper deals with possibilities of precise position control. The main idea is based on usage of thermoelasticity phenomenon. The main part of proposed device is a dilatation element that is induc-tively heated by alternating current, which leads to its stretching. After reaching the dilatation required, the Joule losses in the sys-tem must be reduced on the value corresponding to the total loss of heat. The task represents a triply coupled problem combined with optimization of the time evolution of the field current whose amplitude must vary in time appropriately. The methodology is illustrated by a typical example.

Utilization of MHD Pumps of Molten Metal for Cooling of Fast Nuclear Reactors

  • Autoři: prof. Ing. Ivo Doležel, CSc., Donátová, M., Karban, P., Ulrych, B.
  • Publikace: Transactions on Computer Applications in Electrical Engineering. Poznaň: Poznan University of Technology, 2009. pp. 1-7. ISBN 978-83-89333-24-7.
  • Rok: 2009
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Pumps of molten metal based on magnetohydrodynamic principle represent an alternative to classical rotational pumps. These prospective devices without movable parts may advantageously be used for pumping cooling medium in some types of nuclear reactors of the fourth generation. The paper deals with the mathematical and computer modeling of their operation. The theoretical analysis is illustrated by an example whose results are discussed.

A Study of Appropriate Arrangement of Thermoelastic Actuator

  • Autoři: prof. Ing. Ivo Doležel, CSc., Donátová, M., Karban, P., Ulrych, B.
  • Publikace: Advances in Electrical and Electronic Engineering. 2008, 7(1-2), 128-133. ISSN 1336-1376.
  • Rok: 2008
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The paper analyses operation properties of thermoelastic actuators in the dependence of selected geometrical parameters of the device and also the amplitude and frequency of the field current. The task is solved as a coupled electromagnetic-thermoelastic problem. The theoretical considerations are illustrated on an example whose results are discussed.

Actuators Based on Principle of Thermoelasticity for Producing Extreme Forces

  • Autoři: prof. Ing. Ivo Doležel, CSc., Donátová, M., Karban, P., Ulrych, B.
  • Publikace: Symposium on Electric Machines and Drives, Power Electronics and Drive Control 2008. Prague: Institute of Thermomechanics, AS CR, v.v.i., 2008. pp. 13-17. ISBN 978-80-87012-13-0.
  • Rok: 2008
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Actuators working on the principle of thermoelasticity represent promising devices for fixing tasks in the industrial environment. The paper deals with the computer simulation of their operations both in the dynamic regimes. The task represents a multiply coupled problem characterized by interaction of electromagnetic field, temperature field and a field of thermoelastic displacements. The corresponding mathematical model is solid in hard-coupled formulation. The methodology is illustrated on a typical example.

Arbitrary-Level Hanging Nodes and Automatic Adaptivity in the hp-FEM

  • Autoři: Šolín, P., Červený, J., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: Mathematics and Computers in Simulation. 2008, 77(01), 117-132. ISSN 0378-4754.
  • Rok: 2008
  • DOI: 10.1016/j.matcom.2007.02.011
  • Odkaz: https://doi.org/10.1016/j.matcom.2007.02.011
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    In this paper we present a new automatic adaptivity algorithm for the hp-FEM which is based on arbitrary-level hanging nodes and local element projections. The method is very simple to implement compared to other existing hp-adaptive strategies, while its performance is comparable or superior. This is demonstrated on several numerical examples which include the L-shape domain problem, a problem with internal layer, and the Girkmann problem of linear elasticity. With appropriate simplifications, the proposed technique can be applied to standard lower-order and spectral finite element methods.

Computer Simulation of Operation Characteristics of Thermoelastic Actuators

  • Autoři: prof. Ing. Ivo Doležel, CSc., Karban, P., Ulrych, B.
  • Publikace: Transactions on Computer Applications in Electrical Engineering. Poznaň: Poznan University of Technology, 2008. pp. 68-79. ISBN 978-83-89333-19-3.
  • Rok: 2008
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The paper deals with numerical modeling of an actuator working on the principle of thermoelasticity. The task representing a coupled problem is solved in a combined formulation. The theoretical analysis is illustrated on a typical example whose results are discussed.

Coupled Analysis of a 3-Phase Linear Actuator

  • Autoři: prof. Ing. Ivo Doležel, CSc., Donátová, M., Karban, P., Ulrych, B.
  • Publikace: International Conference on Electrical Machines and Systems 2008 (ICEMS 2008). Huazhong: Huazhong University of Science and Technology, 2008. pp. 3740-3745. ISBN 978-7-5062-9221-4.
  • Rok: 2008
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Multiphase actuators with linear motion of the movable element play an important role in a lot of industrial processes (robotics, manipulation with material etc.). The paper deals with their evaluation not only from the mechanical viewpoint, but also from the viewpoints of thermal and thermoelastic effects. The theoretical analysis is illustrated by an example.

Coupled Analysis of a 3-Phase Linear Actuator

  • Autoři: Bartoš, S., prof. Ing. Ivo Doležel, CSc., Jehlička, V., Nečesaný, J., Škramlík, J., prof. Ing. Viktor Valouch, CSc.,
  • Publikace: International Conference on Electrical Machines and Systems 2008 (ICEMS 2008). Huazhong: Huazhong University of Science and Technology, 2008. pp. 1-6. ISBN 978-7-5062-9221-4.
  • Rok: 2008
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Multiphase actuators with linear motion of the movable element play an important role in a lot of industrial processes (robotics, manipulation with material etc.). The paper deals with their evaluation not only from the mechanical viewpoint, but also from the viewpoints of thermal and thermoelastic effects. The theoretical analysis is illustrated by an example.

Dynamic Behavior of Actuator Working on Principle of Thermoelasticity

  • Autoři: prof. Ing. Ivo Doležel, CSc., Donátová, M., Karban, P., Šolín, P.
  • Publikace: Proceedings of the 2008 International Conference on Electrical Machines. Piscataway: IEEE, 2008. pp. 1-4. ISBN 978-1-4244-1736-0.
  • Rok: 2008
  • DOI: 10.1109/ICELMACH.2008.4799984
  • Odkaz: https://doi.org/10.1109/ICELMACH.2008.4799984
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The paper deals with the mathematical and computer modeling of dynamic characteristics of thermoelastic actuators providing information about the time evolution of various important quantities (temperature rise, displacements, etc.). As the task represents a nonstationary and nonlinear multiply coupled contact problem, its solution is carried out under certain simplifications. The methodology proposed for its solution is illustrated by a typical example whose results are discussed.

Dynamic Characteristics of Thermoelastic Actuators

  • Autoři: prof. Ing. Ivo Doležel, CSc., Donátová, M., Karban, P.
  • Publikace: International Conference on Electrical Machines and Systems 2008 (ICEMS 2008). Huazhong: Huazhong University of Science and Technology, 2008. pp. 1-5. ISBN 978-7-5062-9221-4.
  • Rok: 2008
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The paper presents an actuator working on the principle of thermoelasticity and deals with modeling of its operation properties. The theoretical analysis of the device (that represents a nonlinear and nonstationary multiply coupled problem) is illustrated by a typical example.

Effective Design of Field Coils for Magnetohydrodynamic Pumps of Liquid Metals

  • Autoři: Donátová, M., Karban, P., Ulrych, B., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: Transactions on Computer Applications in Electrical Engineering. Poznaň: Poznan University of Technology, 2008. pp. 17-18. ISBN 978-83-89333-19-3.
  • Rok: 2008
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The paper represents a study whose aim is to provide a hint how to design the system of field coils in magnetohydrodynamic pumps that would produce a highly uniform magnetic field in the channel of circular and rectangular profiles. The methodology is illustrated on an example whose results are discussed.

Induction Heating of Long Aluminium Billets Rotating in Uniform Magnetic Field

  • Autoři: Donátová, M., Karban, P., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: Sborník konference ELEN 2008. Praha: ČVUT FEL, Katedra elektroenergetiky, 2008. pp. 1-4. ISBN 978-80-254-2293-9.
  • Rok: 2008
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Induction heating of aluminum billets by their rotation in uniform magnetic field represents a modern technology whose purpose is to soften these workpieces before their hot forming. The paper presents a coupled integrodifferential model of the process that is used for the computation of a typical example.

Integrodifferential Approach to Modelling of Continual Induction Heating of Nonmagnetic Cylindrical Bodies

  • Autoři: prof. Ing. Ivo Doležel, CSc., Karban, P., Donátová, M.
  • Publikace: Acta Technica CSAV. 2008, 53(2), 173-192. ISSN 0001-7043.
  • Rok: 2008
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    For modeling of continual induction heating of nonmagnetic bodies the paper offers integrodifferential approach providing the direct computation of spatial and temporal distributions of eddy currents and Joule losses in the heated body. The algorithm is illustrated by an example whose results are validated by a professional FEM-based code.

Integrodifferential Model of Induction Heating of Nonmag-netic Cylindrical Billet Rotating in Uniform Magnetic Field

  • Autoři: Donátová, M., Karban, P., prof. Ing. Ivo Doležel, CSc., Ulrych, B.
  • Publikace: 9th International Workshop "Computational Problems of Electrical Engineering". Lviv: Lviv Polytechnic National University, 2008. pp. 53-55.
  • Rok: 2008
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Induction heating of nonmagnetic cylindrical billets rotating in uniform magnetic field before their hot forming belongs to mod-ern industrial technologies characterized by higher efficiency than classical ways of heating. The paper presents an integrodifferen-tial model of the process. The suggested algorithm of calculation is illustrated by an example whose results are discussed.

Limit Operation Regimes of Actuators Working on Principle of Thermoelasticity

  • Autoři: prof. Ing. Ivo Doležel, CSc., Karban, P., Ulrych, B., Pantelyat, M., Matyukhin, Y., Gontarowsky, P., Shulzhenko, N.
  • Publikace: IEEE Transactions on Magnetics. 2008, 44(6), 810-813. ISSN 0018-9464.
  • Rok: 2008
  • DOI: 10.1109/TMAG.2007.916226
  • Odkaz: https://doi.org/10.1109/TMAG.2007.916226
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The paper deals with the limit operation regimes of a thermoelastic actuator that are influenced by geometry of the device, materials and parameters of the field current. The task is solved as a coupled problem where the electromagnetic field is supposed to be independent of the fields of the temperature and mechanical strains and stresses. On the other hand, the two last fields are solved simultaneously. The methodology is illustrated on a typical example.

Possibility of MHD-Based Pumping of Cooling Media (Molten Pb) in Nuclear Reactors of Fourth Generation

  • Autoři: prof. Ing. Ivo Doležel, CSc., Donátová, M., Karban, P., Ulrych, B.
  • Publikace: IC-SPETO 2008. Gliwice: Silesian Technical University, 2008. pp. 5-6. ISBN 978-83-85940-30-2.
  • Rok: 2008
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The paper deals with the possibility of using magnetohydrodynamic pumps for cooling nuclear reactors of the fourth generation by molten lead. The main parameters of the pumps were obtained from the transferred heat output distributed to the chosen number of pumps. The design of the pump and finding of its pumping lead was carried out using a professional code. The methodology is illustrated on a practical example.

Pumps of Molten Metal Based on Magnetohydrodynamic Principle for Cooling High-Temperature Nuclear Reactors

  • Autoři: prof. Ing. Ivo Doležel, CSc., Donátová, M., Karban, P., Ulrych, B.
  • Publikace: 9th International Workshop "Computational Problems of Electrical Engineering". Lviv: Lviv Polytechnic National University, 2008. pp. 56-58.
  • Rok: 2008
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Pumps of molten metals based on magnetohydrodynamic princi-ple represent an advantageous alternative to classical rotational pumps used for cooling of some types of nuclear reactors. The paper deals with the mathematical and computer modelling of their operation. The theoretical analysis is illustrated by an exam-ple whose results are discussed.

Simulation of Continual Induction Heating of Nonferromagnetic Bodies

  • Autoři: Karban, P., prof. Ing. Ivo Doležel, CSc., Šolín, P.
  • Publikace: Electricity Applications in Modern World. Silesian University of Technology, 2008. p. 75-76. ISSN 0033-2097. ISBN 83-88415-80-8.
  • Rok: 2008
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The presented integrodifferential approach is, as an alternative to finite element technique, used for modeling of continual induction heating. The methodology directly provides the spatial and temporal distribution of eddy currents in the heated body.

Simultaneous Effects of Convection and Thermal Radiation as a Generalized Boundary Condition of Temperature Fields of Bodies in Unbounded Gas Media

  • Autoři: Barglik, J., prof. Ing. Ivo Doležel, CSc., Karban, P., Smagór, A., Ulrych, B.
  • Publikace: Electricity Applications in Modern World. Silesian University of Technology, 2008. p. 129-130. ISSN 0033-2097. ISBN 83-88415-80-8.
  • Rok: 2008
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The paper is aimed at the problems of evaluation of the mutual impact of natural convection and thermal radiation as a boundary condition of (both stationary and nonstationary) temperature fields of solid bodies located in unbounded and unmoving gas environment.

Solution of 3D Singular Electrostatic Problems Using Adaptive hp-FEM

  • DOI: 10.1108/03321640810878360
  • Odkaz: https://doi.org/10.1108/03321640810878360
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Nowadays, the best numerical method for the solution of most singular problems is the adaptive hp-version of the FEM based on spatial refinements toward the singularities combined with optimal variation of polynomial degrees on the elements. In this contribution we present some aspects of adaptive hp-FEM in 3D, mention differences with respect to the simpler 2D setting, and demonstrate its efficiency on a 3D electrostatic problem with singular solution.

The Coupled Problems in Power Engineering Applications

  • Autoři: prof. Ing. Ivo Doležel, CSc., Karban, P., Šolín, P., Ulrych, B.
  • Publikace: Proceedings of the 9th International Scientific Conference Electric Power Engineering 2008. Brno: Brno University of Technology, 2008. p. 385-392. ISBN 978-80-214-3650-3.
  • Rok: 2008
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Generally, coupled problems we call tasks characterized by mutual interaction of several physical fields. In heavy current and power engineering domains (characterized by low frequencies or slow time variations of electric and magnetic quantities) we suppose that the primary role in such tasks is played by the electromagnetic fields. The authors present several typical coupled problems in this area, show their mathematical and computer models, discuss the possibilities of their numerical solution and illustrate them on particular examples.

Theoretical and Experimental Investigation of Parasitic Effects in Induction Motor Drives Supplied from Semiconductor Inverters

  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The paper deals with the numerical modeling of a pulse-width modulated voltage inverter-fed induction motor drive for the common and differential current modes. The proposed model of the drive respects the influence of the feeding cable described by the lumped or distributed parameters. The theoretical analysis is supplemented by results of relevant simulations and experiments. Evaluated are also the frequency characteristics of selected parts of the system and their contributions to its resultant harmonic spectra.

Utilization of MHD Pumps of Molten Metal for Cooling of High-Temperature Nuclear Reactors

  • Autoři: prof. Ing. Ivo Doležel, CSc., Donátová, M., Karban, P., Ulrych, B.
  • Publikace: Sborník konference ELEN 2008. Praha: ČVUT FEL, Katedra elektroenergetiky, 2008. pp. 1-6. ISBN 978-80-254-2293-9.
  • Rok: 2008
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    MHD pumps represent prospective devices without movable parts that may be used for pumping molten metals instead of classical rotational pumps. The paper analyses the possibilities of their employment for pumping molten lead as cooling medium in nuclear reactors of the fourth generation.

Computer Modeling and Optimization of DC Actuators with a System of Permanent Magnets

  • Autoři: Ulrych, B., Karban, P., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: X CLEEE - 10th Portuguese-Spanish Congress in Electrical Engineering. Lisboa: Portuguese Association for the Development of Electrical Engineering, 2007. ISBN 978-972-8822-08-8.
  • Rok: 2007
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    DC electromagnetic actuators with permanent magnets are devices with promising parameters and operation characteristics (relatively high forces at reasonable shifts) that can be used in numerous industrial applications. Their properties follow particularly from the arrangement of the permanent magnets in their magnetic circuits (that may be connected in series, in parallel) or even in more complicated ways. The paper deals with their numerical FEM-based modeling and searching of optimal configurations. The theoretical analysis is illustrated on several examples whose results are discussed.

Computer Simulation of Free Boundary in Process of Levitation Induction Melting

  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The paper deals with the mathematical and computer simulation of free boundary of melt in the process of induction levitation melting. Its shape is given by the balance of forces acting on its surface. The methodology is illustrated on a typical example solved by combination of code ANSYS and special procedures developed by the authors.

Computer Simulation of Operation Characteristics of Thermoelastic Actuator

  • Autoři: Ulrych, B., Karban, P., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: XII Konferencja Zastosowania Komputerów w Elektrotechnice. Poznaň: Instytut Elektrotechniki Przemyslowej Politechniki Poznanskiej, 2007. pp. 249-250. ISBN 978-83-923978-4-7.
  • Rok: 2007
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The paper deals with numerical modeling of an actuator working on the principle of thermoelasticity. The task representing a coupled problem is solved in a combined formulation. The theoretical analysis is illustrated on a typical example whose results are discussed.

Continual Induction Hardening of 3D Steel Bodies of Specific Geometries

  • Autoři: Barglik, J., prof. Ing. Ivo Doležel, CSc., Karban, P.
  • Publikace: Przeglad Elektrotechniczny. 2007, 83(3), 75-77. ISSN 0033-2097.
  • Rok: 2007
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The paper deals with simulation of continual surface induction hardening of 3D steel bodies that represents, from the physical point of view, a complicated coupled problem. Derived is its basic mathematical model consisting of two partial differential equations with time variable boundary conditions that describe the distribution of electromagnetic and temperature fields. These fields are solved numerically by combination of professional codes and procedures developed and written by the authors. The methodology is illustrated on an example whose results are discussed.

Control of Movement of Artificial Satellites by Geomagnetic Field

  • Autoři: Büllow, J., prof. Ing. Ivo Doležel, CSc., Kabeláč, J., Karban, P., Ulrych, B.
  • Publikace: Przeglad Elektrotechniczny. 2007, 82(2), 11-15. ISSN 0033-2097.
  • Rok: 2007
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The paper deals with a possibility of influencing the movement of artificial satellites of the Earth by its geomagnetic field using "tethers", i.e. long, direct current carrying superconductive cables moving together with the satellite. Derived is the continuous mathematical model of the problem consisting of an ordinary nonlinear differential vector equation. Its solution is carried out numerically. The algorithm is illustrated on a typical example whose results are discussed.

Convergence Problems of Integral Modeling of 3D Electrostatic Fields with Singularities

  • Autoři: Hamar, R., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: Proceedings of AMTEE ´07 - Advanced Methods in the Theory of Electrical Engineering. Plzeň: ZČU Plzeň, 2007. pp. 1-5. ISBN 978-80-7043-564-9.
  • Rok: 2007
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Numerous electrostatic fields are characterized by the presence of singularities (for example, at the corners or along the edges of electrically conductive charged bodies). Solutions to the tasks involving such elements by classic low-order differential methods often lead to inaccurate results. One of the prospective methods seems to be the integral approach starting from finding the distribution of the charge using the system of the first-kind Fredholm equations. The paper shows an application of this approach to two electrically conductive cubes in a general position in space. Discretization of their surfaces is performed in several different ways and the results are compared with respect to their convergence.

Electromagnetic Contactless Heat Treatment of Nonferrous Metals and its Selected Applications

  • Autoři: Mach, M., prof. Ing. Ivo Doležel, CSc., Barglik, J., Karban, P.
  • Publikace: Proceedings of the 8th International Scientific Conference Electric Power Engineering 2007. Ostrava: VŠB - Technická univerzita Ostrava, 2007. pp. 1-14. ISBN 978-80-248-1391-2.
  • Rok: 2007
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Electromagnetic contactless heat treatment of levitated nonferrous metals belongs to mature technologies and is applied when very low level of contamination of the processed metal is needed. Two basic manners can be used to realize the technology: the method of a cold crucible and levitation heating (or melting). As the processes consume a lot of energy, the design of the corresponding devices and their parts must be optimized, which requires a thorough knowledge of all physical phenomena that take place during the process.

Electromagnetic Pumping of Molten Metals: Selected Systems and their Numerical Modeling

  • Autoři: Barglik, J., prof. Ing. Ivo Doležel, CSc., Karban, P., Ing. Ladislav Musil, Ph.D., Šolín, P., Ulrych, B.
  • Publikace: IVth International Scientific Symposium ELEKTROENERGETIKA 2007 - Proceedings. Košice: Technická univerzita v Košiciach, 2007. pp. 103-109. ISBN 978-80-553-0400-7.
  • Rok: 2007
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Electromagnetic pumping of liquid metals belongs to rapidly developing industrial technologies that are clean, environmentally friendly and without unfavorable secondary effects. The paper deals with three possible systems applicable for this purpose: a one-phase electrodynamic feeder, a three-phase hydrostatic pump and a magnetohydrodynamic pump. Presented are their mathematical models and schemes used for their numerical solution. The theoretical analysis is illustrated on typical examples from the industrial practice.

Energetic Approach to Investigation of Chaotic Behavior of Low-Dimensional Dynamic Systems and its Illustration on a Two-Disc Rikitake Dynamo

  • Autoři: Pánek, D., Hrušák, J., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: Vesnik of the National University. 2007, 43(596), 46-51. ISSN 0321-0499.
  • Rok: 2007
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Investigation of many nonlinear dynamic systems represents an extremely complicated business due to possibility of occurrence of chaotic phenomena. One of the modern and powerful methods for predicting their behavior is the energetic approach. The paper presents its fundamental ideas and illustrates its application to a two-disc Rikitake dynamo.

High-Frequency Parasitic Currents in Inverter-Fed Induction Motor Drives

  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The paper deals with the numerical modeling of a pulse-width modulated voltage IGBT or IGCT inverter-fed induction motor drive for the common and differential current modes. The proposed model of the drive respects the influence of the feeding cable described by the lumped or distributed parameters. The theoretical analysis is supplemented by results of relevant simulations and experiments. Evaluated are also the frequency characteristics of selected parts of the system and their contributions to its resultant harmonic spectra.

Integral Computation of Magnetic Field of Shielded Three-Phase Line

  • Autoři: Karban, P., prof. Ing. Ivo Doležel, CSc., Ulrych, B.
  • Publikace: Proceedings of AMTEE ´07 - Advanced Methods in the Theory of Electrical Engineering. Plzeň: ZČU Plzeň, 2007. pp. 1-5. ISBN 978-80-7043-564-9.
  • Rok: 2007
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The paper deals with numerical modeling of a three-phase harmonic-current carrying shielded line. In most similar cases, computation of magnetic field and other associated quantities is realized using the finite element method that is effective, reliable and the results obtained correspond to the physical reality. Nevertheless, the method may become problematic when particular subregions (conductors, insulation, shielding elements) are geometrically incommensurable, which is even the case of thin shielding shells. That is why the authors use the integral approach for modeling of the relevant effects. Presented is its basic continuous mathematical model that is solved numerically. The theoretical analysis is supplemented with a typical example.

Integral Methods of Higher Order of Accuracy in Static or Low-Frequency Applications

  • Autoři: Karban, P., prof. Ing. Ivo Doležel, CSc., Ulrych, B.
  • Publikace: XIV International Symposium on Theoretical Electrical Engineering ISTET 07. Sczeczin: Sczeczin Un., 2007. pp. 1-38. ISBN 978-83-7457-039-8.
  • Rok: 2007
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The integral methods may be advantageous for solution of several classes of problems in static or low-frequency electromagnetism. Typical are various linear tasks characterized by geometrical incommensurability of the involved subdomains, by their motion or ignorance of the boundary conditions. But these methods are also typical by several drawbacks, the most serious being computation of large systems with fully populated matrices. The paper summarizes all basic features of the method and shows a possible way how to reduce the number of the degrees of freedom using higher-order approximations of the investigated quantity in the mesh elements. The theoretical analysis is illustrated on an example whose results are discussed.

Integral Solution of Linear Eddy Current Problems with Motion

  • Autoři: prof. Ing. Ivo Doležel, CSc., Karban, P., Šolín, P., Ulrych, B.
  • Publikace: X CLEEE - 10th Portuguese-Spanish Congress in Electrical Engineering. Lisboa: Portuguese Association for the Development of Electrical Engineering, 2007. ISBN 978-972-8822-08-8.
  • Rok: 2007
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The paper deals with an integral approach to the numerical solution of eddy current problems with motion, which represents a good alternative to the finite element technique provided that the system under investigation is linear and magnetically homogeneous. Its principal advantage consists in avoiding the remeshing of the whole definition area at each time step. Presented is the general continuous mathematical model formed by a system of integral or integrodifferential equations, and mentioned way of its discretization and consequent computer processing using own code. The theoretical analysis is illustrated on two examples.

Integrodifferential Approach to Modeling of Eddy Currents in Low-Frequency Electromagnetic Systems with Motion

  • Autoři: prof. Ing. Ivo Doležel, CSc., Karban, P., Ulrych, B.
  • Publikace: Zastosowania Elektromagnetyzmu w Nowoczesnych Technikach i Informatyce. Wisla: Centralny Instytut Ochrony Pracy, 2007. pp. 39-41. ISSN 1233-3336.
  • Rok: 2007
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The paper represents a study on linear systems with eddy currents and motion. The derived methodology allows solving the spatial and temporal distribution of eddy currents in electrically conductive moving parts of the system. An illustrative example shows the possibilities of the developed technique.

Integrodifferential Numerical Model of Nonmagnetic Shielding Effects

  • Autoři: prof. Ing. Ivo Doležel, CSc., Karban, P., Šolín, P., Ulrych, B.
  • Publikace: International Conference on Electrical Machines and Systems - ICEMS 2007. Seoul: KIEE - The Korean Institute of Electrical Engineering, 2007. pp. 1-3. ISBN 978-89-86510-07-2.
  • Rok: 2007
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Numerical analysis of the effects of nonmagnetic shielding elements is nowadays usually performed by the finite element techniques. Their application may, however, become problematic when these elements are thin (sheets or tubes) or geometrically incommensurable with other parts of the system. In case that the problem is linear, the integrodifferential approach can represent a good and reliable alternative. The paper presents the relevant continuous mathematical model, discusses its discretization and algorithms of its solution. The theoretical considerations are illustrated on several examples.

Limit Operation Regimes of Actuators Working on Principle of Thermoelasticity

  • Autoři: prof. Ing. Ivo Doležel, CSc., Karban, P., Ulrych, B., Pantelyat, M., Matyukhin, Y., Gontarowskiy, P., Shulzhenko, N.
  • Publikace: COMPUMAG 2007. Aachen: RWTH, 2007. pp. 1-5.
  • Rok: 2007
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Actuators working on the principle of thermoelasticity exhibit specific properties (particularly very high forces at small shifts) and may be used, for example, as prospective fixing elements in numerous industrial applications. But huge mechanical strains and stresses in their active structural parts may lead to irreversible damage or even destruction of the whole device. The paper deals with the limit operation regimes of a typical actuator of this kind that are influenced by geometry of the device, materials and parameters of the field current. The task is solved as a coupled problem where the electromagnetic field is supposed to be independent of the fields of the temperature and mechanical strains and stresses. On the other hand, the two last fields are solved simultaneously. The methodology is illustrated on a typical example.

Modeling of a Linear Electrodynamic Launcher by Integrodifferential Method

  • Autoři: Karban, P., Ulrych, B., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: XII Konferencja Zastosowania Komputerów w Elektrotechnice. Poznaň: Instytut Elektrotechniki Przemyslowej Politechniki Poznanskiej, 2007. pp. 8-9. ISBN 978-83-923978-4-7.
  • Rok: 2007
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The paper deals with the numerical modeling of an electrodynamic launcher using the integrodifferential approach. Its principal advantage (unlike the schemes derived from various differential methods) consists in avoiding the remeshing of the time-variable definition area at particular time steps. The theoretical analysis is illustrated on a typical example whose results are discussed.

Modeling of Internal Parameters of Massive Conductors Carrying Time-Varying Currents Using Integrodifferential Approach

  • Autoři: prof. Ing. Ivo Doležel, CSc., Karban, P., Ulrych, B.
  • Publikace: 30th International Conference on Fundamentals of Electrotechnics And Circuit Theory "SPETO'07". Ustron: Instytut Elektrotechniki Teoretycznej I Przemyslowej Politechniki Slaskiej, 2007. pp. 31-32.
  • Rok: 2007
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The internal parameters (resistance and inductance) of massive conductors carrying time-variable (for example pulse) currents are complex function of time. The paper presents a numerical method based on an integrodifferential approach that allows their computation in a long massive nonferromagnetic conductor of any cross-section. The theoretical analysis based is illustrated on an example whose results are discussed.

Modeling of Skin Effect by Higher-Order Integrodifferential Approach

  • Autoři: Karban, P., prof. Ing. Ivo Doležel, CSc., Šolín, P.
  • Publikace: IVth International Scientific Symposium ELEKTROENERGETIKA 2007 - Proceedings. Košice: Technická univerzita v Košiciach, 2007. pp. 116-120. ISBN 978-80-553-0400-7.
  • Rok: 2007
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Integrodifferential approach for modeling eddy currents of general time dependence in linear structures may be a powerful and efficient alternative to their classical finite-element analysis, particularly in specific cases characterized by the geometrical incommensurability of the domains involved or ignorance of the boundary conditions, which requires the introduction of an artificial boundary. Beside the classical numerical processing of the continuous mathematical model the paper discusses a more sophisticated algorithm of solution based on the application of the Galerkin technique.

Multi-Mesh hp-FEM for Thermally Conductive Incompressible Flow

  • Autoři: Šolín, P., Červený, J., Dubcová, L., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: Computational Methods for Coupled Problems in Science and Engineering II. Barcelona: CIMNE, 2007. pp. 677-680. ISBN 978-84-96736-18-4.
  • Rok: 2007
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    In this study we apply a higher-order finite element method to thermally conductive incompressible fluid flow described by the Navier-Stokes equations. The velocity components, pressure and temperature are approximated on four different meshes that are adapted to respect the individual behavior of these physical fields. The multi-mesh hp-FEM is described and numerical results are presented.

Numerical Analysis of an MHD Minipump with Permanent Magnets Transporting Molten Metal

  • Autoři: Büllow, J., prof. Ing. Ivo Doležel, CSc., Karban, P., Ulrych, B.
  • Publikace: Vesnik of the National University. 2007, 43(596), 39-45. ISSN 0321-0499.
  • Rok: 2007
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The paper deals with pumping of small amounts of molten metals based on the magnetohydrodynamic effect, where the magnetic field is generated by a system of appropriately arranged permanent magnets. Investigated is particularly the pumping lead of the device as a function of its geometry and field quantities. The theoretical analysis is illustrated on an example whose results are discussed.

Numerical Model of a Thermoelastic Actuator Solved as a Coupled Contact Problem

  • Autoři: prof. Ing. Ivo Doležel, CSc., Karban, P., Ulrych, B., Pantelyat, M., Matyukhin, Y., Gontarowskiy, P.
  • Publikace: COMPEL. 2007, 26(4), 1063-1072. ISSN 0332-1649.
  • Rok: 2007
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Actuators working on the principle of thermoelasticity are a promising technique for fixing tasks in an industrial environment. The paper deals with the computer simulation of their operation. The simulation problem represents a multiply coupled problem characterized by interaction of an electromagnetic field, a temperature field and a field of thermoelastic strains and stresses. The corresponding mathematical model is solved by a strongly coupled formulation (the electromagnetic field is considered as independent of the other two fields that are treated as hard coupled). The methodology is illustrated on a typical example.

Numerical Modeling of MHD Effect for Pumping of Molten Metals

  • Autoři: Büllow, J., prof. Ing. Ivo Doležel, CSc., Karban, P., Ulrych, B.
  • Publikace: Proceedings of AMTEE ´07 - Advanced Methods in the Theory of Electrical Engineering. Plzeň: ZČU Plzeň, 2007. pp. 1-4. ISBN 978-80-7043-564-9.
  • Rok: 2007
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The paper deals with the numerical modeling of pumping molten metals based on the principle of the magnetohydrodynamic effect, i.e. force effect of an external stationary current field and magnetic field on an electrically conductive liquid. Described is the physical essence of the effect that represents the starting point for the formulation of its mathematical model. The theoretical analysis is illustrated on two examples. The first pump works with practically uniform electric field in a hydrodynamically less favorable channel of rectangular cross-section while the second one with nonuniform electric field in hydrodynamically more advantageous circular channel. The conclusion is devoted to the discussion about the possibilities of optimization of the device.

Operation Parameters and Characteristics of Actuators with Dilatation Element

  • Autoři: prof. Ing. Ivo Doležel, CSc., Karban, P., Ulrych, B., Barglik, J., Pantelyat, M., Matyukhin, Y., Gontarowskiy, P.
  • Publikace: Proceedings of AMTEE ´07 - Advanced Methods in the Theory of Electrical Engineering. Plzeň: ZČU Plzeň, 2007. pp. 1-5. ISBN 978-80-7043-564-9.
  • Rok: 2007
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    In specific applications one needs actuators characterized by very high forces at small shifts. As actuators of classical constructions mostly cannot satisfy these requirements, the authors designed another arrangement with an inductively heated dilatation element. But huge mechanical strains and stresses of thermoelastic origin acting in its structural parts could lead to its damage or destruction. The paper deals with mathematical modeling of the device that is solved numerically in the combined formulation (while the electromagnetic field is solved independently, the thermal and thermoelastic effects are solved in the hard-coupled formulation). The algorithm is illustrated on a typical example whose results are discussed.

Optimal Arrangement of Electromagnetic Feeder of Molten Metals

  • Autoři: prof. Ing. Ivo Doležel, CSc., Karban, P., Ulrych, B.
  • Publikace: 30th International Conference on Fundamentals of Electrotechnics And Circuit Theory "SPETO'07". Ustron: Instytut Elektrotechniki Teoretycznej I Przemyslowej Politechniki Slaskiej, 2007, pp. 17-18.
  • Rok: 2007
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Pumping of molten metals can be realized by several ways using corresponding devices. The paper deals with one type of such a device - electromagnetic hydrostatic feeder supplied by three-phase electric current and working in a periodical regime. Described is the principle of its operation in common with the formulation of its mathematical and then numerical models. The crucial part of the paper is the presentation and discussion of the results obtained from the computation of two feeders equipped with differently arranged field windings.

Possibilities of Electromagnetic Pumping of Molten Metals and their Numerical Modeling

  • Autoři: Karban, P., prof. Ing. Ivo Doležel, CSc., Ulrych, B.
  • Publikace: International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering 2007. Praha: ČVUT FEL, Katedra elektroenergetiky, 2007, pp. 383-384. ISBN 978-80-01-03784-3.
  • Rok: 2007
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Electromagnetic pumps and feeders of molten metals are widely spread devices used in many branches of industry. Their operation is, however, accompanied by a high consumption of energy. Improvement of their efficiency and optimization of their design requires detailed knowledge of the relevant electromagnetic (and sometimes also thermo- and hydrodynamic) processes. The paper deals with the principles of operation of such devices, presents their mathematical models and techniques of their numerical solution. The theoretical analysis is illustrated on typical examples providing the fundamental ideas about their operation parameters and characteristics.

Possibilities of Numerical Modeling of Continual Induction Heating of Nonferrous Metal Bodies

  • Autoři: prof. Ing. Ivo Doležel, CSc., Karban, P., Ulrych, B., Barglik, J.
  • Publikace: IVth International Scientific Symposium ELEKTROENERGETIKA 2007 - Proceedings. Košice: Technická univerzita v Košiciach, 2007. pp. 110-115. ISBN 978-80-553-0400-7.
  • Rok: 2007
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The paper deals with modeling of the temporal and spatial distributions of the eddy currents and specific Joule losses in a nonferrous body heated by induction. Presented are two methods based on the differential and integral approaches. Derived and explained are the corresponding mathematical models and discussed are possibilities of their numerical solution. Summarized are also their advantages and drawbacks. The methodologies are illustrated on an example of heating a nonmagnetic cylinder by a ring inductor slowly moving along it.

Solution of 3D Singular Electrostatic Problems Using Adaptive hp-FEM

  • Autoři: Kůs, P., Šolín, P., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering 2007. Praha: ČVUT FEL, Katedra elektroenergetiky, 2007. pp. 350-351. ISBN 978-80-01-03784-3.
  • Rok: 2007
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    For most numerical methods, accurate resolution of singularities occurring at sharp re-entrant corners or edges of electrically conductive objects is highly problematic. Finite differences are known for their inability to treat complex geometries, and traditional low-order (piecewise-linear or quadratic) finite element methods (FEM) exhibit extremely poor convergence.

Surface Induction Hardening of Steel Bodies Used in Plastic Working Technologies

  • Autoři: Karban, P., Barglik, J., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: Computer Applications in Electrical Engineering 2007. Warszawa: Polish Academy of Sciences, 2007, pp. 196-206.
  • Rok: 2007
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The paper deals with continual induction surface hardening of 3D bodies of specific geometries. Presented are mathematical and computer models of the process that is simulated numerically by combination of professional SW and procedures developed by the authors. The algorithms are demonstrated on an example whose results are discussed.

Computation of General Nonstationary 2D Eddy Currents in Linear Moving Arrangements Using Integrodifferential Approach

  • DOI: 10.1108/03321640610666790
  • Odkaz: https://doi.org/10.1108/03321640610666790
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Most eddy current problems are solved using numerical schemes based on the differential approach. Nevertheless, there exist several classes of tasks where use of this approach may be complicated (problems characterized by geometrical incommensurability of individual subdomains, motion etc.). In such cases, application of the integrodifferential approach may be an advantage. The paper seeks to present the theoretical background of the method.

Computer Model of Thermoelastic Actuator Solved as Coupled Contact Problem

  • Autoři: Ulrych, B., prof. Ing. Ivo Doležel, CSc., Pantelyat, M., Matyukhin, Y., Gontarowskiy, P.
  • Publikace: XIX-th Symposium Electromagnetic Phenomena in Nonlinear Circuits. Poznaň: University of Technology, 2006. pp. 77-78. ISSN 0332-1649. ISBN 83-921340-1-X.
  • Rok: 2006
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The paper deals with the mathematical and computer model-ing of an actuator working on the principle of thermoelastic-ity. The task represents a multiply coupled problem charac-terized by interaction of electromagnetic field, temperature field and field of thermoelastic strains and stresses that is solved in quasi-coupled formulation. The methodology is illustrated on a typical example.

Computer Simulation of Actuators Working on Principle of Thermoelasticity

  • Autoři: Pantelyat, M., Matyukhin, Y., Gontarowskiy, P., prof. Ing. Ivo Doležel, CSc., Karban, P., Ulrych, B.
  • Publikace: XVII-th International Conference on Electrical Machines (ICEM 2006). Athens: National Technical University, 2006. pp. 1-4.
  • Rok: 2006
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Electromechanical actuators working on the principle of thermoelasticity represent prospective control devices in a lot of industrial, transport and other applications where high forces are needed on relatively small shifts. The paper deals with the computer simulation of such devices. Their ma-thematical models are given by three partial differential equations describing electromagnetic field, temperature field and field of thermoelastic displacements and must usu-ally be solved as contact task. The methodology is illus-trated on an example of a typical device of this kind. The results obtained are analyzed and discussed.

Computer Simulation of Free Boundary in Process of Levitation Induction Melting

  • Autoři: prof. Ing. Ivo Doležel, CSc., Mach, M.
  • Publikace: Zastosowania Elektromagnetyzmu w Nowoczesnych Technikach i Informatyce. Wisla: Centralny Instytut Ochrony Pracy, 2006. pp. 87-91. ISSN 1233-3336.
  • Rok: 2006
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The paper deals with the mathematical and computer simu-lation of free boundary of melt in the process of induction levitation melting. Its shape is given by the balance of forces acting on its surface. The methodology is illustrated on a typical example solved by combination of code AN-SYS and special procedures developed by the authors.

Continual Induction Hardening of 3D Steel Bodies of Specific Geometries

  • Autoři: Barglik, J., prof. Ing. Ivo Doležel, CSc., Karban, P.
  • Publikace: Zeszyty Naukowe Politechniki Łódzkiej, "Elektryka". 2006, 2006(1), 107-116. ISSN 0374-4817.
  • Rok: 2006
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The paper deals with simulation of continual surface induc-tion hardening of 3D steel bodies that represents, from the physical point of view, a relatively complicated coupled problem. Derived is its basic mathematical model consisting of two partial differential equations with time variable boundary conditions that describe the distribution of elec-tromagnetic and temperature fields. These fields are solved numerically by combination of professional codes and pro-cedures developed and written by the authors. The method-ology is illustrated on an example whose results are dis-cussed.

Design of Electromagnetic Actuator with System of Permanent Magnets

  • Autoři: Karban, P., Ulrych, B., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: VII-th International Workshop "Computational Problems of Electrical Engineering" CPEE'2006. Lviv: Lvivskij nacionalnyj universitet, 2006. pp. 69-72. ISBN 966-553-542-0.
  • Rok: 2006
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The paper deals with the investigation of selected operation parameters and characteristics of a cylindrical actuator with more permanent magnets connected in series or in parallel that are magnetized in the radial direction. The theoretical analysis is supplemented with several illustrative examples calculated by the FE technique whose results are discussed.

Electromagnetic Treatment of Molten Metals and Mod-eling of Free Boundary of Melt

  • Autoři: Mach, M., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: The 12th International Symposium on Numerical Field Calculation in Electrical Engineering - Abstracts. Graz: Graz University of Technology, 2006. pp. 101. ISBN 3-902465-56-5.
  • Rok: 2006
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The paper deals with computer simulation of selected proc-esses in molten metals controlled by electromagnetic field. Particular attention is paid to the free boundary of melt whose shape follows from the balance of forces acting on its surface. The paper presents the corresponding mathematical and computer models supplemented with typical illustrative examples.

Evaluation of Basic Arrangements of Three-phase Actuators with High Lift from Viewpoint of Acting Force

  • Autoři: prof. Ing. Ivo Doležel, CSc., Mayer, D., Ulrych, B.
  • Publikace: 29th International Conference on Fundamentals of Electrotechnics And Circuit Theory "SPETO'06". Ustron: Institut Elektrotechniki Teoretycznej i Przemyslowej Politechniki Slaskej, 2006. pp. 143-146. ISBN 83-85940-28-6.
  • Rok: 2006
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Many industrial processes (such as control technologies, robotics, design of various manipulators, feeders etc.) re-quire that the action elements of corresponding devices have relatively high lift, with static characteristic as flat as possi-ble. These demands obviously cannot be satisfied by actua-tors in classic arrangement. The presented paper deals with two types of actuators built on principles of a linear asyn-chronous motor, particularly actuators with planar air gap and actuators with cylindrical air gap. Their mathematical models are solved by the finite element method with the aim to find their static characteristics. The methodology is illus-trated on two typical examples whose results are discussed.

Free Surface Phenomena in Process of Induction Melting

  • Autoři: Mach, M., prof. Ing. Ivo Doležel, CSc., Barglik, J.
  • Publikace: 29th International Conference on Fundamentals of Electrotechnics And Circuit Theory "SPETO'06". Ustron: Institut Elektrotechniki Teoretycznej i Przemyslowej Politechniki Slaskej, 2006. pp. 109-112. ISBN 83-85940-28-6.
  • Rok: 2006
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The paper deals with 2D induction melting in an axisym-metric crucible and the principal attention is paid to the free level (in the shape of meniscus) that retroactively affects all physical fields taking part in the process. Its continuous mathematical model is discretized in the environment of MatLab and solved iteratively using the finite element method. The methodology is illustrated on several typical examples whose results are discussed.

Integral Analysis of Time Variable Eddy Currents and their Effects in 2D Linear Systems with Moving Elements

  • Autoři: Karban, P., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: 29th International Conference on Fundamentals of Electrotechnics And Circuit Theory "SPETO'06". Ustron: Institut Elektrotechniki Teoretycznej i Przemyslowej Politechniki Slaskej, 2006. pp. 131-134. ISBN 83-85940-28-6.
  • Rok: 2006
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The paper presents 3D continuous integrodifferential mathematical model of eddy currents in linear systems with moving subregions. Its discretization is carried out only for 2D Cartesian and axisymmetric arrangements. Derived are also formulas for determining forces acting in individual elements of the systems and also the Joule losses. The methodology is illustrated on two examples calculated by a code fully developed and written by the first author.

Integral Approach to Solution of Nonferromagnetic Electrodynamic Launcher

  • Autoři: Karban, P., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: ELEN 2006 (Elektroenergetika). Praha: České vysoké učení technické v Praze, 2006. pp. 1-4. ISBN 80-239-7650-8.
  • Rok: 2006
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The paper deals with the description of dynamic behavior of a nonferromagnetic electrodynamic launcher. Although the problem itself is not new, an innovative item is determina-tion of eddy currents in the launched body based on the in-tegral approach that provides more accurate results than former algorithms of computation based on the FEM or electric circuit techniques. The methodology is illustrated on an example whose results are discussed.

Integral Model of Pulsed Electrodynamic Launcher

  • Autoři: Karban, P., Ulrych, B., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: The 12th International Symposium on Numerical Field Calculation in Electrical Engineering - Abstracts. Graz: Graz University of Technology, 2006. pp. 64. ISBN 3-902465-56-5.
  • Rok: 2006
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The paper presents an integral approach for numerical simu-lation of the nonferromagnetic electrodynamic launcher. Its mathematical model describing its dynamic behavior con-sists of an integrodifferential equation providing the time evolution of eddy currents in the projectile and two ordi-nary, but strongly nonlinear differential equations for the field current and trajectory of the launched body. The meth-odology is illustrated on a typical example.

Integrodifferential Model of Eddy Currents in Axisymmetric Nonmagnetic Bodies Heated by Moving Inductor

  • Autoři: Karban, P., prof. Ing. Ivo Doležel, CSc., Šolín, P.
  • Publikace: Archives for Electrical Engineering. 2006, 54(4/2005), 197-207. ISSN 0004-0746.
  • Rok: 2006
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The paper offers a method of computation of eddy currents in nonmagnetic bodies heated by a moving inductor that is based on integrodifferential approach. Instead of magnetic field within the whole definition area this approach directly provides the time evolution of eddy current densities in the heated body. Derived is the complete system of the integro-differential equations, representing the continuous mathe-matical model for a general 3D arrangement. Its discretiza-tion including building of corresponding numerical schemes is performed, however, only for 2D axisymmetric arrange-ments. The methodology is illustrated on a typical example.

Levitation of Superconductive Cable in Earth's Magnetic Field

  • Autoři: Karban, P., prof. Ing. Ivo Doležel, CSc., Ulrych, B.
  • Publikace: Advances in Electrical and Electronic Engineering. 2006, 5(1-2), 267-272. ISSN 1336-1376.
  • Rok: 2006
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The paper represents an introductory study about a superconductive cable levitating in Earth's magnetic field. Built are two mathematical models of the problem providing both the shape of the arc of the cable and forces acting along it. The theoretical analysis is supplemented with an illustrative example.

Limit Operation Regimes of Selected Power Semiconductor Elements

  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Operation regimes of modern power semiconductor devices (such as IGCT thyristors or IGBT transistors) are characterized by switching high currents of the order of kA at the voltage level of several kV. Although their internal and eventual contact resistances are very low, the Joule losses in them reach quite high values and corresponding heat may lead to unacceptable temperature rise. The paper represents an introductory study in the area and deals with partial mathematical and computer modeling of the temperature rise of an axisymmetric device during its operation in several regimes. The methodology is illustrated on an example of a real IGCT device. Selected results are compared with measurements.

Optimization of actuator with permanent magnet from viewpoint of their arrangement and total mass of magnetic circuit

  • Autoři: prof. Ing. Ivo Doležel, CSc., Karban, P., Ulrych, B.
  • Publikace: Journal of Electrical Engineering. 2006, 57(8 SUPPL), 181-184. ISSN 1335-3632.
  • Rok: 2006
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Actuators with permanent magnets represent modern and prospective devices with widely controllable parameters as the lift and magnetic force acting on its movable parts. The paper represents an introductory study of such a device with more permanent magnets connected in series. Solution of its mathematical model is illustrated on a typical example whose results are discussed.

Optimized Shape of System for Levitation Heating

  • Autoři: Mach, M., Ulrych, B., prof. Ing. Ivo Doležel, CSc., Nečesaný, J.
  • Publikace: Computer Applications in Electrical Engineering. Warszawa: Polish Academy of Sciences, 2006. pp. 192-204. ISBN 83-922049-3-X.
  • Rok: 2006
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Levitation induction heating represents the first step of levi-tation melting, which is an advanced technology used for processing of superclean metals or metal alloys. The proc-essed body is lifted in a system of suitably arranged field coils and heated by the Joule losses. The paper investigates heating of bodies of various shapes from the viewpoint of its velocity. The theoretical analysis is supplemented by an illustrative example.

Possibility of Influencing Motion of Artificial Satellites by Interaction with Earth's Magnetic Field

  • Autoři: Büllow, J., prof. Ing. Ivo Doležel, CSc., Karban, P., Ulrych, B.
  • Publikace: VII-th International Workshop "Computational Problems of Electrical Engineering" CPEE'2006. Lviv: Lvivskij nacionalnyj universitet, 2006. pp. 42-45. ISBN 966-553-542-0.
  • Rok: 2006
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The paper deals with the possibilities of influencing motion of artificial satellites by Earth's magnetic field. The neces-sary force is produced by a tether carrying sufficiently high current. Presented is the basic mathematical model of the investigated effect and algorithm of its solution. The meth-odology is illustrated on a typical example whose results are discussed.

Selected Processes in Molten Metals Controlled by Electromagnetic Field and Their Computer Simulation

  • Autoři: Mach, M., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: ELEN 2006 (Elektroenergetika). Praha: České vysoké učení technické v Praze, 2006. pp. 1-4. ISBN 80-239-7650-8.
  • Rok: 2006
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The paper presents some important results obtained by the authors during the three-year work in the domain of elec-tromagnetic stirring and levitation melting. From the view-point of mathematical modeling both processes represent coupled problems characterized by mutual interaction of two or three physical fields, together with evaluation of various force effects. The theoretical analysis is illustrated on two typical examples whose results are discussed.

State of the Art of Continual Induction Hardening: Computer Modeling and Experiments

  • Autoři: Barglik, J., prof. Ing. Ivo Doležel, CSc., Karban, P., Ulrych, B.
  • Publikace: Electromagnetic Processing of Materials "EPM'2006". Tokyo: The Iron and Steel Institute of Japan, 2006. pp. 479-484.
  • Rok: 2006
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Continual induction hardening belongs to efficient and envi-ronmentally friendly technologies used for improvement of selected mechanical properties of steel bodies. The process is realized by an inductor slowly moving along the body whose heated part is then immediately cooled by a quenchant. The paper deals with its mathematical modeling and experimental verification. Presented is full algorithm of the solution that is solved by own code (2D) and Femlab (3D). The methodology is illustrated on two examples whose results are discussed and compared with experiments.

Surface Induction Hardening of Steel Tools Used in Plastic Working Technologies

  • Autoři: Karban, P., Barglik, J., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: XI Konferencja Zastosowania Komputerów w Elektrotechnice. Poznan: Wydawnictvo Institutu Elektrotechniki Przemyslovej Politechniki Poznanskej, 2006. pp. 305-306. ISBN 83-922049-4-8.
  • Rok: 2006
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The paper deals with continual induction surface hardening of 3D bodies of specific geometries. Presented are mathe-matical and computer models of the process that are solved numerically by combination of professional SW and own procedures. The algorithms are demonstrated on an example.

Comparison of Continual and Simultaneous Surface Induction Hardening of Conical Steel Mandrels

  • Autoři: Barglik, J., Kwiecen, I., prof. Ing. Ivo Doležel, CSc., Karban, P., Ulrych, B.
  • Publikace: ZKwE'2005. Poznan: Wydawnictvo Institutu Elektrotechniki Przemyslovej Politechniki Poznanskej, 2005. pp. 101-102. ISBN 83-922049-2-1.
  • Rok: 2005
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The paper deals with comparison of simultaneous and continual induction surface hardening of axisymmetric bodies. Presented are mathematical and computer models of the process that are solved numerically by SW developed by the authors. The algorithms are demonstrated on two examples whose results are discussed

Comparison of Two Ways of Induction Hardening of Long Steel Tubes

  • Autoři: Barglik, J., prof. Ing. Ivo Doležel, CSc., Karban, P., Kwiecen, I., Ulrych, B.
  • Publikace: ISTET'2005. Lviv: Publishing House Lviv Polytechnic, 2005. pp. 11-14. ISBN 966-553-470-X.
  • Rok: 2005
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Steel tubes for transporting mixtures of loose materials (for example sands) with water or other liquids have to be highly mechanically resistant, particularly with respect to abrasion. The principal possibility how to reach such resistance is hardening of their internal surface, which is mostly realized by a continual induction-based process. During it the inductor together with the sprayer slowly moves along the tube and heats it wall that is immediately cooled by spraying quenchant. The paper compares two ways of the process differing by the position of the inductor (inside and outside the tube). The mathematical model of the problem is solved in the quasi-coupled formulation. The methodology is illustrated on typical examples whose results are discussed.

Computation of General Nonstationary 2D Eddy Currents in Linear Moving Arrangements Using Integrodifferential Approach

  • Autoři: Karban, P., prof. Ing. Ivo Doležel, CSc., Šolín, P.
  • Publikace: ISEF'05. Vigo: Universidad de Vigo, 2005. pp. CE-1.2. ISBN 84-609-7057-4.
  • Rok: 2005
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Nowadays, most of the eddy current problems are solved using numerical schemes based on the differential approach. Nevertheless, there exist several classes of tasks where use of this approach may be complicated (problems characterized by geometrical incommensurability of individual subdomains, motion etc). In such a case, application of the integro-differential approach may be an advantage. The paper presents the theoretical background of the method. The mathematical model consists of a system of integrodifferential equations for current densities in electrically conductive domains. The methodology is illustrated on an example. All computations are realized by a code completely developed and written by the authors.

Continual Induction Hardening of Axisymmetric Bodies

  • Autoři: prof. Ing. Ivo Doležel, CSc., Ulrych, B., Barglik, J.
  • Publikace: Journal of Materials Processing Technology. 2005, 6(161), 269-275. ISSN 0924-0136.
  • Rok: 2005
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The paper presents a methodology of computer modelling of continual surface induction hardening of axi-symmetric bodies. The body is heated by a cylindrical inductor moving at a given velocity along it and the heated part is then cooled by spraying water. While the mathematical model of induction heating is given by two partial differential equations describing the harmonic electromagnetic and nonstationary temperature fields with one moving subregion, the process of cooling is modelled by a theoretically empirical algorithm based on experimental data and providing the value of the convective heat transfer coefficient. Theoretical analysis of the task is supplemented with an illustrative example and discussion of the results. Computations are performed by combination of professional codes and single-purpose user programs developed and written by the authors.

Continual Induction Hardening of Long Iron Pipes

  • Autoři: Barglik, J., prof. Ing. Ivo Doležel, CSc., Karban, P., Kwiecen, I., Ulrych, B.
  • Publikace: SPETO'2005. Ustron: Institut Elektrotechniki Teoretycznej i Przemyslowej Politechniki Slaskej, 2005. pp. 59-62. ISBN 83-85940-27-8.
  • Rok: 2005
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Transport of loose materials is often realized by technology consisting in their mixing with water or another suitable liquid and consequent conveyance of the mix through long iron pipes. The internal surface of such pipes is then exposed to strong unfavorable mechanical influences, in particular abrasion, which can lead to their successive damage or even destruction. That is why these surfaces have to be sufficiently mechanically resistant. And one of the ways how to reach it is their continual induction hardening. The paper presents the complete mathematical model of the process. While the distribution of the electromagnetic and temperature fields in the pipe is modeled in a standard manner using the time-variable boundary condition, the process of cooling is solved by an approximate theoretically empirical procedure based on experimental data. Computations are performed by a code fully developed and written by the authors.

DC Ferromagnetic Actuator for Extremely High Forces

  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The paper deals with numerical modelling of small DC ferromagnetic switching electromagnets for transfer of extremely high forces. These devices work with high field currents producing considerable temperature rise of their structural parts. Investigated are characteristics of the device, particularly in limit operation regimes. The task is formulated as a quasi-coupled electromagnetic-thermal problem. Evaluated are also consequent strains and stresses acting in the shell. The theoretical analysis is supplemented with an illustrative example.

Design of Power Magnetic Chute Separator and Minimization of its External Magnetic Field

  • Autoři: Karban, P., Ulrych, B., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: PowerTech. St. Peterburg: Energy Systems Institute, 2005. pp. 1-6. ISBN 5-93208-034-0.
  • Rok: 2005
  • DOI: 10.1109/PTC.2005.4524561
  • Odkaz: https://doi.org/10.1109/PTC.2005.4524561
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Magnetic chute separator is a device for extracting ferrous particles from dry bulk materials. The material falls down through a chute with strong transverse magnetic field generated by permanent magnets or field coils carrying DC current. Ferrous particles are then attracted to the walls of the chute where the magnetic field reaches the highest value. In order to prevent the field from penetrating outside the device, it is necessary - with respect to the existing hygienic standards - to use appropriately designed shielding satisfying, of course, acceptable construction and financial requirements. As the magnetic field is practically stationary, it is reasonable to use only passive shielding elements. The paper deals with the design and optimization of shielding elements of a typical separator of this type with two field coils. The problem is treated as a fully 3D task.

Determination of Circuit Parameters of High-Frequency Profile Conductors

  • Autoři: prof. Ing. Ivo Doležel, CSc., Ulrych, B., Karban, P., Dvořák, P.
  • Publikace: Vesnik of the National University. 2005, 2004(504), 226-234. ISSN 0321-0499.
  • Rok: 2005
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The paper deals with differential and integral methods of computation of effective impedance of profile conductors carrying harmonic currents for a wide range of frequencies. Investigated is particularly the influence of varying profiles of the conductors for the same surface of their cross-sections. The theoretical analysis is illustrated on several examples.

Dynamic Characteristic of Aluminum Sphere Levitating in Electromagnetic Field Respecting its Induction Heating

  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The paper deals with numerical solution of electromagnetic-thermo-mechanical transient associated with levitation heating of a nonferromagnetic sphere in harmonic electromagnetic field. Investigated is the period during which the body gets from the starting position to the final levitating position in the inductor that is, however, influenced by its next heating. The problem is solved in quasi-coupled formulation. Theoretical considerations are illustrated on an example whose results are discussed.

Electromagnetic and Temperature Fields in Molten Aluminum Stirred in Crucible Induction Furnace

  • Autoři: Barglik, J., prof. Ing. Ivo Doležel, CSc., Mach, M., Trutwin, D., Ulrych, B.
  • Publikace: Electric Power Engineering 2005. Ostrava: VŠB-TUO, 2005. p. 1-6. ISBN 978-80-248-0842-0.
  • Rok: 2005
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The paper deals with the mathematical and computer modeling of quasi-coupled electromagnetic, temperature and hydrostatic fields in molten aluminum in a typical crucible induction furnace. After the process of melting, the melt is further inductively heated to reach the casting temperature that is typically higher by about 200 oC than the melting point. Then the active power of inductors is reduced to a level making possible only to keep the temperature at that value. During that time, however, more or less intensive stirring of the melt takes place because of presence of the Lorentz forces acting in melt.

Electromagnetic Field in a Tubular Workpiece Heated from Inside by Induction

  • Autoři: prof. Ing. Ivo Doležel, CSc., Baron, B., Piatek, Z.
  • Publikace: Przeglad Elektrotechniczny. 2005, 81(6), 48-51. ISSN 0033-2097.
  • Rok: 2005
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    In the paper we present a critical view on the existing solution describing the electromagnetic field in a tubular conducting workpiece placed in external longitudinal sinusoidal magnetic field cast on the inside surface of the tubular workpiece. We suggest another solution, which takes into account the so-called interaction of magnetic field created due to eddy currents induced in the workpiece. The resultant formulas are the basis for calculation and graphs of distribution of magnetic field strength in all domains of the system.

Electromechanical Actuator Working on Principle of Thermoelasticity

  • Autoři: Beneš, K., prof. Ing. Ivo Doležel, CSc., Ulrych, B.
  • Publikace: SPETO'2005. Ustron: Institut Elektrotechniki Teoretycznej i Przemyslowej Politechniki Slaskej, 2005. pp. 107-110. ISBN 83-85940-27-8.
  • Rok: 2005
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Electromechanical actuators of various kinds play an important role in numerous industrial processes, control systems, robotics and a lot of other applications, transforming electromagnetic energy into mechanical forces. In case that we require only small shifts of their movable parts (but accompanied by relatively high forces), it is possible to make use of thermoelastic displacements of a metal or bimetal membrane produced by electric heat. The paper presents an elementary study of such a device providing information about its basic properties and operation characteristics. The problem is handled as a weakly coupled electromagnetic-thermoelastic task and solved by a combination of professional code and single-purpose procedures developed and written by the authors. The algorithm is illustrated on a typical example whose results are discussed.

Electromechanical Design and Optimization of Electromagnetic Brake for Rail Vehicles

  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    An electromagnetic brake for rail vehicles has to produce the maximum drag force at the lowest field current and highest possible efficiency. This can be achieved only by simultaneous high-level optimization of its magnetic circuit and arrangement of the field coils. The paper presents the complete electromechanical solution of the problem. The first part is aimed at a more detailed specification of the technical problem with respect to the principal requirements and limitations concerning technical aspects of the device. The next step is aimed at forming the mathematical model that is solved by the finite element method. The main part of the paper contains a typical example in several variants (even with respecting abrasion) with illustrative results. Properties of the suggested variants are compared with the properties of the up to now manufactured device that was designed by the classical method based on solution of discrete magnetic circuits.

Forces Acting in Capacitor with Movable Elastic Electrode

  • Autoři: prof. Ing. Ivo Doležel, CSc., Hamar, R., Ulrych, B.
  • Publikace: SPETO'2005. Ustron: Institut Elektrotechniki Teoretycznej i Przemyslowej Politechniki Slaskej, 2005. pp. 19-22. ISBN 83-85940-27-8.
  • Rok: 2005
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The paper deals wits forces acting between two electrodes of a capacitor with one elastic electrode that may serve as a part of a microrobot. While distribution of charges on both electrodes (supplied from the source of pulse voltage) is solved by the integral approach (Fredholm equation of the first kind), the total force acting on the elastic electrode is determined from integral expression. The theoretical analysis is illustrated on an example whose results are discussed.

Frozen Field Phenomena in Electrically Conductive Media Solved by Means of Classical Electrosynamics

  • Autoři: prof. Ing. Ivo Doležel, CSc., Karban, P., Mayer, D., Ulrych, B.
  • Publikace: AMTEE´05. Plzeň: Západočeská univerzita v Plzni, 2005. pp. A13-A22. ISBN 80-7043-392-2.
  • Rok: 2005
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    . The concept "frozen field" is often used in association with behavior of strongly electrically conductive media. Being introduced in astrophysics the phenomenon consists in drift of magnetic field by electrically well conductive medium (plasma or ionized mixture of gas and dust particles) that moves due to some primary mechanism not immediately associated with this magnetic field. The paper presents the description of the effect by means of classical electrodynamics in nonrelativistic medium and its solution in an integral formulation. The methodology is illustrated on an example investigating drift of magnetic field by a silver ring moving at a changing velocity in primary nonhomogeneous magnetic field.

Influence of Thermoelastic Displacements on Force Effects of Extremely Loaded DC Actuators

  • Autoři: prof. Ing. Ivo Doležel, CSc., Dvořák, P., Ulrych, B.
  • Publikace: SME'2005. Opole: Institute of Electromechanical Systems and industrial Electronics in Opole, 2005. pp. 269-273. ISBN 83-88492-74-8.
  • Rok: 2005
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The magnetic force acting on the movable parts of a DC actuator usually depends on its construction, used materials and field current. But in case that the actuator works as a switching device for a longer time, the field current may cause its heating and consequent thermoelastic deformations of thermally conductive structural parts. These deformations lead (on the condition that the body of the actuator is fixed to an external supporting) to thermoelastic strains and stresses resulting in another force of thermoelastic origin. The paper deals with analysis of both forces in a typical device in which the above effects can be expected - in an actuator working as a fixing device in numerically controlled machines.

Innovation of Electromagnetic Brake for Rail Vehicles

  • Autoři: Ulrych, B., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: SME'2005. Opole: Institute of Electromechanical Systems and industrial Electronics in Opole, 2005. pp. 650-653. ISBN 83-88492-74-8.
  • Rok: 2005
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The principal demand on the electromagnetic emergency brake in rail vehicles is to produce the maximum drag force at the lowest field current and highest efficiency. This may be reached only by high-level optimization of its magnetic circuit and arrangement of the field coils. The paper presents the complete solution of the problem. The first part is aimed at a more detailed specification of the technical problem with respect to the principal requirements and limitations concerning technical aspects of the device. The next step is aimed at forming the mathematical FEM model. The main part of the paper contains a typical example in several variants with results accompanied by discussion. Properties of the suggested solution are compared with the characteristics of the up to now manufactured device that was designed by the classic method based on solution of discrete magnetic circuits. The final part deals with possibilities of further improvement of these types of magnetic brakes.

Integral Model of Eddy Currents of Arbitrary Time Dependence

  • Autoři: Karban, P., prof. Ing. Ivo Doležel, CSc., Ulrych, B.
  • Publikace: SPETO'2005. Ustron: Institut Elektrotechniki Teoretycznej i Przemyslowej Politechniki Slaskej, 2005. pp. 71-74. ISBN 83-85940-27-8.
  • Rok: 2005
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Problems of eddy currents and associated effects in linear metal structures are nowadays prevailingly solved by various differential techniques. But complications may appear in arrangements with geometrically incommensurable or moving elements. Difficulties may also be caused by ignorance of boundary conditions, which is typical for tasks of this kind. One of the alternatives how to solve such problems is the integral approach. Its basic continuous mathematical model consists of a system of the second-kind Fredholm integral equations with a time derivative of current densities in the integrand. The paper presents a general derivation of these equations in 3D. Their next processing is shown only in 2D. Presented is an illustrative example demonstrating capabilities of the suggested algorithm and their results are compared with values obtained by other ways. Discussed are advantages and drawbacks of the approach and further possibilities of its improvement.

Integral Model of Forces Acting on Long Massive Conductors during Short Circuit

  • Autoři: Karban, P., prof. Ing. Ivo Doležel, CSc., Ulrych, B.
  • Publikace: Sborník z 3. vědeckého sympózia elektroenergetika 2005. Košice: Technická univerzita v Košiciach, 2005. pp. 1-6. ISBN 9788055303994.
  • Rok: 2005
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Dynamic short-circuit forces acting among long massive conductors of a three-phase system represent complex time-dependent functions of time. Distribution of these currents over the cross-sections of particular conductors is, moreover, not uniform due to skin and proximity effects. Nowadays, evaluation of the short-circuit forces is mostly realized by approximate formulas employing the known time evolution of the short-circuit currents and coefficients respecting the arrangement of the conductors and shapes of their cross-sections. The paper presents an accurate method developed by the authors, starting from the distribution of time-dependent current densities in the conductors obtained directly by numerical solution of a system of integrodifferential equations.

Integrodifferential Model of Eddy Currents in Axisymmetric Nonmagnetic Bodies Heated by Moving Inductor

  • Autoři: Karban, P., prof. Ing. Ivo Doležel, CSc., Šolín, P.
  • Publikace: REI'05. Silesian University of Technology, 2005. pp. 217-223. ISBN 83-88415-40-9.
  • Rok: 2005
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Continual induction heating represents a technological process used in numerous applications. The workpiece is heated by a cylindrical inductor carrying harmonic current slowly moving along it. The basic mathematical model of the process consists of two partial differential equations describing the distribution of electromagnetic and temperature fields. Both fields are characterized by time variable boundary conditions. The model is usually solved by numerical algorithms starting from differential techniques. The paper offers an alternative to this method based on the integral approach, suitable for solving linear problems of this kind. Instead of magnetic field within the whole definition area this approach directly provides the time evolution of eddy current densities in the heated body. Derived is the complete system of the integrodifferential equations, representing the continuous mathematical model for a general 3D arrangement. The methodology is illustrated on a typical example.

Levitation Heating as a Multiparametric Coupled Problem

  • Autoři: prof. Ing. Ivo Doležel, CSc., Mach, M., Nečesaný, J.
  • Publikace: 9th Spanish Portuguese Congress on Electrical Engineering. Vigo: AEDIE - Asociación Espaňola para el Desarrollo de la Ingeniería Eléctrica, 2005. pp. 1-7. ISBN 84-609-5231-2.
  • Rok: 2005
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Levitation heating of electrically conductive nonmagnetic bodies (as the first step of their levitation melting) represents a relatively complicated process characterized by mutual interaction of electromagnetic and temperature fields and possibly also by eventual movement of the heated body. Its mathematical model consists of a system of partial and ordinary (generally nonlinear) differential equations whose coefficients are temperature-dependent functions. The velocity and overall efficiency of heating depends on a lot of parameters such as geometry of the inductors, shape of the heated body, amplitudes and frequency of the field currents etc. The paper deals with detailed analysis of a two-inductor axisymmetric arrangement with the aim to optimize its configuration and accelerate the heating as much as possible. The problem is solved in the quasicoupled formulation. The theoretical results are illustrated on an example.

Modelling of Continual Induction Hardening in Quasi-Coupled Formulation

  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Continual induction hardening of steel workpieces belongs to modern and environmentally friendly industrial technologies. The body is heated by an inductor moving at a low velocity along it and the heated part is then immediately cooled by spraying quenchant. The paper presents a methodology where the induction heating (time and space variable distribution of the electromagnetic and temperature fields) is modelled in a slightly modified standard manner while the process of cooling by an approximate theoretically empirical procedure based on experimental data. The theoretical analysis of the task is supplemented with an illustrative example and discussion of the results. Computations are performed by combination of a professional code and a number of single-purpose user programs developed and written by the authors.

Modelling of Temperature-Dependent Effective Impedance of Non-ferromagnetic Massive Conductor

  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Impedance of long direct massive conductors carrying time-variable currents is a complex function of time. Its evolution is affected not only by the skin effect, but also by the temperature rise. The paper presents a numerical method that allows computing the resistance and internal inductance of a nonferromagnetic conductor of any cross-section from values of the total Joule losses and magnetic energy within the conductor. The theoretical analysis based on the field approach is illustrated on a typical example, whose results are discussed.

On Electromagnetic Stirring of Molten Materials

  • Autoři: prof. Ing. Ivo Doležel, CSc., Šolín, P., Ulrych, B., Zítka, M.
  • Publikace: Acta Technica CSAV. 2005, 50(1), 35-51. ISSN 0001-7043.
  • Rok: 2005
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The stirring of molten metals by means of electromagnetic fields is a successful novel technology that has the potential to increase the quality of metal and alloy products by degasification of the melts, improving their homogeneity and preventing the formation of dendrite crystals during solidification. This paper presents a numerical model of this process based on the incompressible Navier-Stokes equations endowed by appropriate free-surface boundary conditions. The equations are discretized by the second-order semi-implicit Oseen-Crank-Nicolson scheme on fully-staggered finite difference grids. The electromagnetic (Lorentz) forcing term is determined from the Maxwell equations. Various properties of the model and numerical scheme are discussed, and numerical examples are presented.

On hp-Finite Element Method for Singular Electro- and Magnetostatic Problems

  • Autoři: Šolín, P., Zítka, M., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: ISEF'05. Vigo: Universidad de Vigo, 2005. pp. EE-1.8. ISBN 84-609-7057-4.
  • Rok: 2005
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    In this paper we explain the origin of singularities in electro- and magnetostatics problems, and mention the major difficulties related to their efficient and accurate numerical resolution. We present the basic ideas of the hp-finite element method (FEM), and describe briefly our modular object-oriented hp-FEM program package HERMES. Superiority of the hp-FEM over the standard FEM for problems with singularities is demonstrated on a practical electrostatics simulation.

On Some Aspect of Levitation Heating of Metal Bodies

  • Autoři: prof. Ing. Ivo Doležel, CSc., Mach, M., Karban, P.
  • Publikace: Acta Electrotechnica et Informatica. 2005, 5(2), 5-10. ISSN 1335-8243.
  • Rok: 2005
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Levitation induction heating represents the first step of levitation melting, which is an advanced technology used for processing of superclean metals or metal alloys. A workpiece is lifted by the Lorentz forces in time variable magnetic field produced by a system of suitably placed field coils and then heated by the Joule losses. The paper deals with optimization of the heating process from the viewpoint of the velocity of heating the workpiece. Investigated is the influence of its shape (sphere, cylinder, truncated cone) and arrangement of the field coil. The theoretical analysis is supplemented by a series of particular examples and discussion of the results obtained.

Optimization of Electromagnetic Shielding of Induction Device for Isothermic Stirring of Molten Steel

  • Autoři: Mach, M., Karban, P., Ulrych, B., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: PowerTech. St. Peterburg: Energy Systems Institute, 2005. pp. 1-6. ISBN 5-93208-034-0.
  • Rok: 2005
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Electromagnetic stirring of steels represents a modern technological process whose purpose is degasification of melt, its homogenization (particularly in case of various steel alloys) and better nucleation characterized by practically isotropic structure of later solidified material. The process requires, however, a lot of energy for generating such magnetic field that is capable of producing sufficiently high internal sources of heat (must be approximately equal to the heat losses) and dynamic forces that make the melt (up to tens of tons) move. The total efficiency of the device may be improved by using suitable shielding elements that, moreover, prevent the magnetic field from penetrating out of the device. The paper presents a study concerning design of such shielding elements for a particular pan. Evaluated is their influence not only on distribution of magnetic field, but also on distribution of the resultant Joule losses and Lorentz forces in melt.

Optimization of Magnetic Circuit of Electromagnetic Brake for Rail Vehicles

  • Autoři: Ulrych, B., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: ZKwE'2005. Poznan: Wydawnictvo Institutu Elektrotechniki Przemyslovej Politechniki Poznanskej, 2005. pp. 299-300. ISBN 83-922049-2-1.
  • Rok: 2005
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The paper deals with numerical 2D solution and optimization of the magnetic circuit of an electromagnetic brake for rail vehicles. Presented are both mathematical model and the most important characteristic of the device before and after optimization

Optimized Shape of Workpiece for Levitation Heating

  • Autoři: Mach, M., Ulrych, B., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: ZKwE'2005. Poznan: Wydawnictvo Institutu Elektrotechniki Przemyslovej Politechniki Poznanskej, 2005. pp. 87-88. ISBN 83-922049-2-1.
  • Rok: 2005
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Levitation induction heating represents the first step of levitation melting, which is an advanced technology used for processing of superclean metals or metal alloys. The processed body is lifted in a system of suitably placed field coils and heated by the Joule losses. The paper investigates heating of bodies of various shapes from the viewpoint of its velocity. The theoretical analysis is supplemented by an illustrative example

Overview of Selected Numerical Methods for Computation of Electromagnetic and other Physical Fields in Power Applications

  • Autoři: prof. Ing. Ivo Doležel, CSc., Barglik, J., Šolín, P., Karban, P., Ulrych, B.
  • Publikace: REI'05. Silesian University of Technology, 2005. pp. 13-26. ISBN 83-88415-40-9.
  • Rok: 2005
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    In a lot of tasks the knowledge of electromagnetic fields themselves does not represent the final goal of our effort, but just the starting point for evaluation of their thermal, force and other effects. This is typical, for example, for a wide class of coupled problems in electromagnetics characterized by mutual interaction of several physical fields influencing one another. Their mathematical models are usually given by a set of partial differential equations describing the particular fields that may be supplemented with another set of ordinary differential equations describing behavior of various associated circuits. Successful and sufficiently accurate solution to these systems requires advanced algorithms and numerical schemes that are reliable, robust and fast. The paper summarizes the mostly extended methods, shows their principal advantages and drawbacks and also presents two prospective methods worked out by the authors. Some of them are illustrated on typical examples.

Possibilities of Obtaining Flat Static Characteristic of DC Ferromagnetic Actuator

  • Autoři: prof. Ing. Ivo Doležel, CSc., Ulrych, B., Mach, M., Dvořák, P.
  • Publikace: Prace Instytutu Elektrotechniki. 2005, 55(220), 29-40. ISSN 0032-6216.
  • Rok: 2005
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The paper deals with the numerical modelling of the static characteristic of a small linear DC servomotor (actuator) serving as a part of the robot operating in a chemically active environment. Its aim is to evaluate some construction parameters influencing its shape. The solution starts from the mathematical model of this nonlinear system describing the resultant force acting on the plunger. The model is then solved by professional code QuickField supplemented with several single-purpose user procedures. The results of an illustrative example show the principal possibilities how the parameters of the static characteristic can be affected.

Program for Computation of Operation Parameters of Large Transformers

  • Autoři: Karban, P., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: Electric Power Engineering 2005. Ostrava: VŠB-TUO, 2005. p. 1-6. ISBN 978-80-248-0842-0.
  • Rok: 2005
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    The paper presents a program for modeling various quantities and phenomena associated with operation of power transformers based on numerical solution of its electric and magnetic fields. The program is currently used by the SKODA Energo works in Pilsen.

Solution of Nonstationary Eddy Current Problems by Integral Techniques

  • Autoři: prof. Ing. Ivo Doležel, CSc., Karban, P.
  • Publikace: AMTEE´05. Plzeň: Západočeská univerzita v Plzni, 2005. pp. A07-A12. ISBN 80-7043-392-2.
  • Rok: 2005
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Although most eddy problems are theoretically solved by various differential techniques, there exist several classes of tasks where use of the differential approach may be complicated or even prohibitive. Mentioned can be, for example, problems characterized by geometrical incommensurability of individual subdomains, by their motion or by ignorance of the boundary conditions. In such a case, application of the integral approach may be an advantage. The paper presents the theoretical background of the method. The mathematical model consists of a system of integrodifferential equations for current densities in electrically conductive domains supplemented with indirect boundary conditions. Derived are also expressions for the Joule losses and electrodynamic forces acting in particular elements of the system. The methodology is illustrated on an example. All computations are realized by a code completely developed and written by the second author.

Techniques of Processing Solid and Liquid Metals Based on Electromagnetic Induction

  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    A lot of up-to-date industrial technologies associated with treatment of solid and liquid metals are based on thermal and force effects of electromagnetic field. The fundamental process is induction heating of metals that precedes a number of consequent operations such as tempering, drying, melting, stirring, hardening, hot pressing etc. The paper summarizes physical essence of the above processes (that usually represent complex coupled problems) and presents their mathematical and computer models as well as possible methods of their solutions. Theoretical considerations are illustrated on several typical examples solved by the authors.

Temperature Rise of Power Semiconductor Devices

  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Modern power semiconductors represent elements for switching high currents of the order of kA at the voltage level of several kV. The limiting quantity of their operation is, therefore, the temperature rise. The paper represents an introductory study in the domain. Calculated is temperature rise of an axisymmetric device during its operation in various regimes. Distribution of the internal sources of heat was found from experiments. The nonstationary temperature field is solved by means of the Fourier-Kirchhoff equation. The convective heat transfer coefficient necessary for formulation of the boundary condition of the third kind is calculated from velocity of the cooling air. Investigated are several regimes differing by nominal current and frequency of switching. Theoretical considerations are illustrated on several examples of a real IGCT device. The results are compared with measurements and discussed are further possibilities of improvement of the used algorithm.

Time Evolution of Processes in Actuator Working on Principle of Thermoelasticity

  • Autoři: Beneš, K., Dvořák, P., Ulrych, B., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: AMTEE´05. Plzeň: Západočeská univerzita v Plzni, 2005. pp. G1-G8. ISBN 80-7043-392-2.
  • Rok: 2005
  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Linear electromagnetic actuators may transform electromagnetic energy into kinetic energy of straightforward moving part (plunger) in several ways. One of them is conversion of heat produced by eddy currents in a metal membrane to its deformation, which brings about pressure on the plunger. The paper presents a fundamental study of device working on this principle and deals with its construction, operation parameters and optimisation. The corresponding mathematical model is solved in weakly coupled formulation. The theoretical analysis is illustrated on an example.

Actuator with Extremely High Pull-in Force

  • Autoři: prof. Ing. Ivo Doležel, CSc., Dvořák, P., Ulrych, B.
  • Publikace: IC ZKwE '2004. Poznan: Wydawnictvo Institutu Elektrotechniki Przemyslovej Politechniki Poznanskej, 2004. p. 523-526. ISBN 83-912306-7-8.
  • Rok: 2004

Analysis of Inductances in Saturated Induction Machine

  • Pracoviště: Katedra elektrických pohonů a trakce, Katedra elektroenergetiky
  • Anotace:
    The paper focuses on dependences of individual stator winding inductances on magnetic saturation in the induction machine. Magnetizing currents with a range of magnitudes and phase angles were considered to cause saturation of magnetic paths in the machine. Mutual inductances between stator phases for superimposed small signals that do not contribute to the saturation significantly were numerically computed and analysed. The finite element method was employed in the investigation.

Analysis of Inductances in Saturated Induction Machine

  • Pracoviště: Katedra elektrických pohonů a trakce, Katedra elektroenergetiky
  • Anotace:
    The paper focuses on dependences of individual stator winding inductances on magnetic saturation in the induction machine. Magnetizing currents with a range of magnitudes and phase angles were considered to cause saturation of magnetic paths in the machine. Mutual inductances between stator phases for superimposed small signals that do not contribute to the saturation significantly were numerically computed and analysed. The finite element method was employed in the investigation.

Comparison of 2D and 3D Computations of Joule Losses in Thin Nonferromagnetic Sheets Heated by Induction

  • Autoři: Barglik, J., prof. Ing. Ivo Doležel, CSc., Kwiecień, I., Ulrych, B.
  • Publikace: IC SPETO '2004. Ustron: Institut Elektrotechniki Teoretycznej i Przemyslowej Politechniki Slaskej, 2004. p. 101-104. ISBN 83-85940-26-X.
  • Rok: 2004

Comparison of Differential and Integral Models of Skin Effects

  • Autoři: prof. Ing. Ivo Doležel, CSc., Karban, P., Mach, M., Ulrych, B.
  • Publikace: IC SPETO '2004. Ustron: Institut Elektrotechniki Teoretycznej i Przemyslowej Politechniki Slaskej, 2004. p. 7-10. ISBN 83-85940-26-X.
  • Rok: 2004

Comparison of Systems for Levitation Heating of Electrically Conductive Bodies

  • Autoři: prof. Ing. Ivo Doležel, CSc., Dvořák, P., Mach, M., Ulrych, B.
  • Publikace: Advances in Electrical and Electronic Engineering. 2004, 3(2), 161-166. ISSN 1336-1376.
  • Rok: 2004

Computer Modeling of Selected Fault Regimes of DC Actuators

  • Autoři: prof. Ing. Ivo Doležel, CSc., Dvořák, P., Mach, M., Ulrych, B.
  • Publikace: Proceedings of the 3rd IFAC Symposium on Mechatronic Systems. Newcastle: The University of Newcastle, 2004. p. 529-534.
  • Rok: 2004

Computer Modelling of Induction Heating-Based Assembly and Disassembly of Shrink Fits

  • Autoři: Shulzhenko, M., Gontarowskiy, P., Matyukhin, Y., Pantelyat, M., prof. Ing. Ivo Doležel, CSc., Ulrych, B., Beneš, K.
  • Publikace: Acta Technica CSAV. 2004, 49(2), 169-183. ISSN 0001-7043.
  • Rok: 2004

Continual Induction Heating and Associated Phenomena in Quasi-Coupled Formulation

  • Autoři: Karban, P., Ulrych, B., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: ELEN 2004. Praha: České vysoké učení technické v Praze, Fakulta elektrotechnická, 2004. ISBN 80-239-3565-8.
  • Rok: 2004

DC Ferromagnetic Actuator for Extremely High Forces

  • Autoři: prof. Ing. Ivo Doležel, CSc., Mach, M., Ulrych, B.
  • Publikace: ICEM '2004. Lodz: Technical University of Lodz, 2004. ISBN 83-921428-3-7.
  • Rok: 2004

Differential and Integral Models of TOKAMAK

  • Autoři: prof. Ing. Ivo Doležel, CSc., Karban, P., Mach, M., Ulrych, B.
  • Publikace: Advances in Electrical and Electronic Engineering. 2004, 3(2), 281-285. ISSN 1336-1376.
  • Rok: 2004

Dynamic Characteristic of Aluminum Sphere Levitating in Electromagnetic Field Respecting Its Induction Heating

Finite Element Analysis of Electromagnetic, Thermal and Stress-Strain State of Joints during Induction-Based Assembly and Disassembly

  • Autoři: Shulzenko, M., Gontarowskiy, P., Matyukhin, Y., Pantelyat, M., prof. Ing. Ivo Doležel, CSc., Ulrych, B.
  • Publikace: 11th IGTE. Graz: Graz University of Technology, 2004. pp. 106.
  • Rok: 2004

High-Frequency Parasitic Currents in Inverter-Fed Induction Motor Drive

Impedance of Conductors Carrying High-Frequency Currents as a Function of Their Profile

  • Autoři: prof. Ing. Ivo Doležel, CSc., Dvořák, P., Ulrych, B.
  • Publikace: IC TCSET '04. Lviv: Publishing House Lviv Polytechnic, 2004. pp. 126-129. ISBN 966-553-380-0.
  • Rok: 2004

Induction Heating of Metal Cylinder Levitating in Harmonic Electromagnetic Field

  • Autoři: prof. Ing. Ivo Doležel, CSc., Mach, M., Ulrych, B.
  • Publikace: Proceedings of 8th International Conference Problems of Present-day Electrotechnics - PPE 2004. Kyjev: National Academy of Sciences of Ukraine, 2004. p. 3-7. ISSN 0204-3599.
  • Rok: 2004

Integral Analysis of Eddy Currents in Massive Conductors

  • Autoři: Karban, P., Mach, M., Ulrych, B., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: IC ZKwE '2004. Poznan: Wydawnictvo Institutu Elektrotechniki Przemyslovej Politechniki Poznanskej, 2004. p. 135-138. ISBN 83-912306-7-8.
  • Rok: 2004

Integral Model of Skin Effect and Associated Phenomena in Long Massive Conductors

  • Autoři: prof. Ing. Ivo Doležel, CSc., Karban, P., Mach, M., Ulrych, B.
  • Publikace: Proceedings of 8th International Conference Problems of Present-day Electrotechnics - PPE 2004. Kyjev: National Academy of Sciences of Ukraine, 2004. pp. 3-6. ISSN 0204-3599.
  • Rok: 2004

Limit Operation Regimes of DC Actuator-Based Linear Drives

  • Autoři: Barglik, J., prof. Ing. Ivo Doležel, CSc., Dvořák, P., Ulrych, B., Škopek, M.
  • Publikace: Computer Applications in Electrical Engineering. Poznan: Wydawnictvo Institutu Elektrotechniki Przemyslovej Politechniki Poznanskej, 2004. p. 600-611. ISBN 83-912306-6-X.
  • Rok: 2004

Magnetic Field Comparison of the Trolley Bus 21 TR Controlled by GTO and IGBT Thyristor

  • Autoři: Nečesaný, J., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: ELEN 2004. Praha: České vysoké učení technické v Praze, Fakulta elektrotechnická, 2004. ISBN 80-239-3565-8.
  • Rok: 2004

Modelling of Continual Induction Hardening in Quasi-Coupled Formulation

  • Autoři: Barglik, J., prof. Ing. Ivo Doležel, CSc., Karban, P., Ulrych, B.
  • Publikace: IC HES '2004. Padua: Publishing House University of Padua, 2004. p. 599-606. ISBN 88-86281-92-7.
  • Rok: 2004

Modelling of Temperature-Dependent Effective Impedance of Non-ferromagnetic Massive Conductor

Optimization of Device for Induction Stirring of Molten Steel

  • Autoři: prof. Ing. Ivo Doležel, CSc., Dvořák, P., Mach, M., Ulrych, B.
  • Publikace: IC SPETO '2004. Ustron: Institut Elektrotechniki Teoretycznej i Przemyslowej Politechniki Slaskej, 2004. pp. 105-108. ISBN 83-85940-26-X.
  • Rok: 2004

Possibilities of Obtaining Flat Static Characteristics of DC Ferromagnetic Actuator

  • Autoři: prof. Ing. Ivo Doležel, CSc., Dvořák, P., Mach, M., Ulrych, B.
  • Publikace: Proceedings of International Symposium on Micromachines & Servodrives. Warsaw University of Technology, 2004. pp. 67-72. ISBN 83-917944-5-8.
  • Rok: 2004

Static and Dynamic Characteristics of DC Actuator for Extreme Currents

  • Autoři: Dvořák, P., Ulrych, B., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: ELEN 2004. Praha: České vysoké učení technické v Praze, Fakulta elektrotechnická, 2004. ISBN 80-239-3565-8.
  • Rok: 2004

Calculation and Measurements of Electromagnetic Emissions from IGCT-based Chopper

Computation of 3D Electrostatic Fields Excited by Thin Conductors

  • Autoři: Karban, P., Škopek, I., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: AMTEE'03 - Sixth International Conference on Advanced Methods in the Theory of Electrical Engineering applied to power systems. Plzeň: ZČU FE, katedra teoretické elektrotechniky, 2003. pp. A43-A48. ISBN 80-7082-960-5.
  • Rok: 2003

Computer Modelling of Continual Induction Hardening

  • Autoři: prof. Ing. Ivo Doležel, CSc., Ulrych, B., Barglik, J.
  • Publikace: SCI'2003. Orlando: IIIS - International Institute of Informatics and Systemics, 2003. pp. 400-405. ISBN 980-6560-01-9.
  • Rok: 2003

Continual Induction Hardening of Axi-Symmetric Bodies

  • Autoři: prof. Ing. Ivo Doležel, CSc., Barglik, J., Ulrych, B.
  • Publikace: JAPMED'2003. Athens: National Technical University, 2003. pp. 79-82.
  • Rok: 2003

Design of Scalar and Vector-Valued Hierarchic Finite Elements in 2D and 3D

  • Autoři: Šolín, P., Segeth, K., prof. Ing. Ivo Doležel, CSc., Zítka, M.
  • Publikace: Adaptive Modelling and Simulation. Barcelona: Center for Numerical Methods in Engineering, 2003. pp. 145. ISBN 84-95999-30-7.
  • Rok: 2003

Determination of Convective Heat Transfer Coefficient at Continual Heating of Axi-Symmetric Bodies

  • Autoři: Barglik, J., prof. Ing. Ivo Doležel, CSc., Ulrych, B.
  • Publikace: Zeszyty Naukowe Politechniki Lodzkiej, ELEKTRYKA 97. 2003,(101), 9-16. ISSN 0374-4817.
  • Rok: 2003

Distribution of Electric Charge in a System of Charged Conductors of Finite Dimensions

  • Autoři: prof. Ing. Ivo Doležel, CSc., Dvořák, P., Šolín, P., Ulrych, B.
  • Publikace: Electric Power Engineering 2003. Ostrava: VŠB, 2003. pp. 149-150. ISBN 80-248-0225-2.
  • Rok: 2003

Distribution of Electric Charge in a System of Finite Conductors

  • Autoři: prof. Ing. Ivo Doležel, CSc., Kloucek, P., Šolín, P., Ulrych, B.
  • Publikace: Acta Technica CSAV. 2003, 48(1), 1-13. ISSN 0001-7043.
  • Rok: 2003

Effective Resistance of a Conductor as a Function of the Shape of Its Cross-Section and Frequency

  • Autoři: Benešová, M., prof. Ing. Ivo Doležel, CSc., Dvořák, P., Mayer, D., Ulrych, B.
  • Publikace: SPETO'2003. Ustron: Institut Elektrotechniki Teoretycznej i Przemyslowej Politechniki Slaskej, 2003. p. 79-82. ISBN 83-85940-25-1.
  • Rok: 2003

Electromagnetic Modelling of Nonlinear Heating

Elektromagnetické rušení trolejbusu s pohonem IGCT

EMI Generated by Trolley-Bus with IGBT-based Drive

  • Autoři: Budek, P., prof. Ing. Ivo Doležel, CSc., Jehlička, V., Škramlík, J., Valouch, V.
  • Publikace: City of Tomorrow. Praha: Český komitét elektrického tepla, 2003. pp. 82-90. ISBN 80-239-1615-7.
  • Rok: 2003

High-Frequency Interferences in Inverter-Fed Induction Motor Drive

Higher-Order Finite Element Methods

Integral and Special Methods in Modelling of 3D Electric Fields

  • Autoři: prof. Ing. Ivo Doležel, CSc., Hamar, R., Karban, P., Ulrych, B.
  • Publikace: Mathematical Modelling in Electrical Engineering. Lviv: Technical University of Lvov, 2003. pp. 201-208. ISSN 0321-0499.
  • Rok: 2003

Integral Solution of Electrostatic Fields in 3D Arrangements

  • Autoři: Hamar, R., prof. Ing. Ivo Doležel, CSc., Ulrych, B.
  • Publikace: AMTEE'03 - Sixth International Conference on Advanced Methods in the Theory of Electrical Engineering applied to power systems. Plzeň: ZČU FE, katedra teoretické elektrotechniky, 2003. pp. A37-A42. ISBN 80-7082-960-5.
  • Rok: 2003

Limit Operation Regimes of DC Actuator-Based Linear Drives

  • Autoři: Barglik, J., prof. Ing. Ivo Doležel, CSc., Dvořák, P., Ulrych, B., Škopek, M.
  • Publikace: ZKWE'2003. Poznan: Wydawnictvo Institutu Elektrotechniki Przemyslovej Politechniki Poznanskej, 2003. p. 181-184. ISBN 83-912306-4-3.
  • Rok: 2003

Modelling of Induction Heating and Consequent Hardening of Lon Prismatic Bodies

  • Autoři: prof. Ing. Ivo Doležel, CSc., Barglik, J., Sajdak, C., Škopek, M., Ulrych, B.
  • Publikace: COMPEL. 2003,(22), 79-87. ISSN 0332-1649.
  • Rok: 2003

Modelling of Resistance and Inductance of Nonferromagnetic Conductor with Respecting Its Direct Heating

  • Autoři: prof. Ing. Ivo Doležel, CSc., Mayer, D., Ulrych, B.
  • Publikace: Acta Electrotechnica et Informatica. 2003, 3(3), 5-9. ISSN 1335-8243.
  • Rok: 2003

Modelling of Temperature-Dependent Effective Impedance of Nonferromagnetic Massive Conductor

  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Impedance of long direct massive conductors carrying time-variable currents is a complex function of time. Its evolution is affected not only by the skin effect, but also by the temperature rise.

Modelování mezních provozních stavů lineárních stejnosměrných elektromagnetů

  • Autoři: prof. Ing. Ivo Doležel, CSc., Dvořák, P., Ulrych, B.
  • Publikace: Diagnostika 2003. Ostrava: VŠB-TUO, 2003. p. 17-21. ISBN 80-248-0497-2.
  • Rok: 2003

Moderní průmyslové technologie založené na procesech v tekutých kovech řízených elektromagnetickým polem

Numerical Analysis of Induction Heating-Based Assembly and Disassembly of Shrink Fits

  • Autoři: Shulzhenko, M., Gontarowskiy, P., Matyukhin, Y., Pantelyat, M., prof. Ing. Ivo Doležel, CSc., Ulrych, B.
  • Publikace: AMTEE'03 - Sixth International Conference on Advanced Methods in the Theory of Electrical Engineering applied to power systems. Plzeň: ZČU FE, katedra teoretické elektrotechniky, 2003. pp. A65-A73. ISBN 80-7082-960-5.
  • Rok: 2003

On a Fieldless Method for the Computation of Induction-Generated Heat in 3D Non-Ferromagnetic Metal Bodies

  • Autoři: prof. Ing. Ivo Doležel, CSc., Šolín, P., Ulrych, B.
  • Publikace: Mathematics and Computers in Simulation. 2003, 61 239-247. ISSN 0378-4754.
  • Rok: 2003

Solution of 3D Electrostatic Problems in Homogenous Media by Means of Integral Equations

  • Autoři: Hamar, R., prof. Ing. Ivo Doležel, CSc., Ulrych, B.
  • Publikace: SPETO'2003. Ustron: Institut Elektrotechniki Teoretycznej i Przemyslowej Politechniki Slaskej, 2003. pp. 35-38. ISBN 83-85940-25-1.
  • Rok: 2003

Transient Electromagnetic-Thermal Analysis and Optimisation of a DC Actuator-Based Linear Drive

  • Autoři: prof. Ing. Ivo Doležel, CSc., Dvořák, P., Ulrych, B., Barglik, J.
  • Publikace: ISTET'2003. Warsaw University of Technology, 2003. p. 309-312. ISBN 83-916444-1-3.
  • Rok: 2003

Velocity Field in Molten Metal at Electromagnetic Stirring in Cylindrical Crucible

  • Autoři: Matas, R., Ulrych, B., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: CPEE'2003. Warsaw University of Technology, 2003. pp. 41-44. ISBN 83-916444-2-1.
  • Rok: 2003

3D Integral Model of Eddy Currents and Losses in Thin Nonmagnetic Structures in Linear Media

  • Autoři: Barglik, J., prof. Ing. Ivo Doležel, CSc., Škopek, M., Šolín, P., Ulrych, B.
  • Publikace: CEM'2002. London: IEE, 2002. pp. C1.
  • Rok: 2002

3D Integral Model of Indution Heating of Thin Nonmagnetic Structures

  • Autoři: Barglik, J., prof. Ing. Ivo Doležel, CSc., Škopek, M., Šolín, P., Ulrych, B.
  • Publikace: CEFC'2002. Roma: IEEE Magnetic Society, 2002. pp. 276-280.
  • Rok: 2002

Collaboration between Poland and the Czech Republic in the Domain of Electroheat

  • Autoři: Barglik, J., prof. Ing. Ivo Doležel, CSc., Mayer, D., Sajdak, C., Ulrych, B.
  • Publikace: SPETO 2002. Silesian University of Technology, 2002. pp. 125-128. ISBN 83-85940-24-3.
  • Rok: 2002

Computer Aided Design of Electroheat Devices

  • Autoři: Barglik, J., prof. Ing. Ivo Doležel, CSc., Ulryh, B.
  • Publikace: KOMPEI'2002. Silesian University of Technology, 2002. pp. 140-153. ISBN 83-7335-062-4.
  • Rok: 2002

Computer Modelling of Drive Systems Based on Combined DC Actuators

  • Autoři: prof. Ing. Ivo Doležel, CSc., Jaskovská, M., Škopek, M., Ulrych, B.
  • Publikace: ZKWE'2002. Poznan: Wydawnictvo Institutu Elektrotechniki Przemyslovej Politechniki Poznanskej, 2002. p. 587-590. ISBN 83-912306-2-7.
  • Rok: 2002

Computer Modelling of Inductance of AC Fed Coils with Electrically Conductive Non-Linear Ferromagnetic Core

  • Autoři: Benešová, Z., prof. Ing. Ivo Doležel, CSc., Mayer, D., Ulrych, B.
  • Publikace: SPETO 2002. Silesian University of Technology, 2002. p. 133-136. ISBN 83-85940-24-3.
  • Rok: 2002

Computer Modelling of Induction-Heating Based Fixing of Machine Tools

Computer Modelling of Induction-Heating Based Fixing of Machine Tools

Coupled Electromagnetic-Thermal Analysis and Optimisation of a DC Actuator-Based Linear Drive

  • Autoři: Ulrych, B., prof. Ing. Ivo Doležel, CSc., Jaskovská, M., Škopek, M., Vostracký, Z.
  • Publikace: PPE'2002. Moscow: Akademia nauk USSR, 2002. p. 37-40. ISSN 0204-3599.
  • Rok: 2002

Coupled Electromagnetic-Thermal Analysis of Selected Power Semiconductor Devices

Dynamic Characteristics of Combined Actuators

  • Autoři: prof. Ing. Ivo Doležel, CSc., Jaskovská, M., Škopek, M., Ulrych, B.
  • Publikace: Electromagnetic Fields in Electrical Engineering. 22 ed. Warsaw: Warsaw University Press, 2002. p. 401-406. ISBN 1-58603-232-1.
  • Rok: 2002

Electromagnetic Emissions from IGCT-Based Chopper for Trolleybus

Electromagnetic Stirring of Molten Metal in Induction Crucible Furnace

  • Autoři: Barglik, J., prof. Ing. Ivo Doležel, CSc., Škopek, M., Ulrych, B.
  • Publikace: Acta Technica CSAV. 2002, 47(3), 229-242. ISSN 0001-7043.
  • Rok: 2002

Elektromagnetická pole generovaná venkovními vedeními vvn a jejich vliv na životní prostředí

Fieldless Methods for the Simulation of Induction Heating of 3D-Non-Ferromagnetic Metal Bodies

  • Autoři: prof. Ing. Ivo Doležel, CSc., Šolín, P., Ulrych, B.
  • Publikace: Software and Algorithms of Numerical Mathematics. Proceedings of the 14th Summer School. Pilsen: University of West Bohemia, 2002. p. 59-72. ISBN 80-7082-898-6.
  • Rok: 2002

Induction Hardening of Ferromagnetic Bodies

  • Autoři: Barglik, J., prof. Ing. Ivo Doležel, CSc., Škopek, M., Ulrych, B.
  • Publikace: Elektrowärme International. 2002,(1), 28-29. ISSN 0340-3521.
  • Rok: 2002

Induction Heating of Three-Dimensional Metal Bodies by Moving Inductors

  • Autoři: Šolín, P., prof. Ing. Ivo Doležel, CSc., Ulrych, B.
  • Publikace: SCEE'2002. Eindhoven: Eindhoven University of Technology, 2002. pp. S. ISBN 90-90-15894-4.
  • Rok: 2002

Influence of Shielding Elements on Temperature Regime in Crucible for Stirring Molten Metal

  • Autoři: prof. Ing. Ivo Doležel, CSc., Hamar, R., Ulrych, B.
  • Publikace: Experience and Vision on Modern Technologies in 21st Century in Power Engineering. Praha: Český komitét elektrického tepla, 2002. pp. 51-58. ISBN 80-238-9841-8.
  • Rok: 2002

Integral Model of Electromagnetic and Temperature Fields in Thin Electrically Conductive Non-Magnetic Structures

  • Autoři: prof. Ing. Ivo Doležel, CSc., Šolín, P., Škopek, M., Ulrych, B., Jaskovská, M.
  • Publikace: PPE'2002. Moscow: Akademia nauk USSR, 2002. p. 9-12. ISSN 0204-3599.
  • Rok: 2002

Integral Solution of Eddy Current Problems in Nonmagnetic Media

  • Autoři: prof. Ing. Ivo Doležel, CSc., Haškovec, J., Šolín, P., Ulrych, B.
  • Publikace: IGTE'2002. Graz: Graz University of Technology, 2002. pp. 327-330. ISBN 3-901351-65-5.
  • Rok: 2002

Isothermic Stirring in Crucible Furnace as a Coupled Magnetohydrodynamic Problem

  • Autoři: Barglik, J., prof. Ing. Ivo Doležel, CSc., Škopek, M., Šolín, P., Ulrych, B.
  • Publikace: SPETO 2002. Silesian University of Technology, 2002. pp. 129-132. ISBN 83-85940-24-3.
  • Rok: 2002

Mathematical and Computer Modelling of DC Actuator-Based Linear Drivers

  • Autoři: prof. Ing. Ivo Doležel, CSc., Škopek, M., Ulrych, B., Vostracký, Z.
  • Publikace: Časopis Národního centra "Nové Technologie". Plzeň: Národní centrum "Nové Technologie", 2002. p. 29-33. ISBN 80-7082-891-9.
  • Rok: 2002

Mathematical and Computer Modelling of Induction Heating and Consequent Hardening of Circular Saw

  • Autoři: Barglik, J., prof. Ing. Ivo Doležel, CSc., Ducki, K., Ulrych, B.
  • Publikace: Electromagnetic Fields in Electrical Engineering. 22 ed. Warsaw: Warsaw University Press, 2002. p. 351-356. ISBN 1-58603-232-1.
  • Rok: 2002

Modelling of Induction Heating and Consequent Hardening of Long Prismatic Bodies

  • Autoři: Barglik, J., prof. Ing. Ivo Doležel, CSc., Sajdak, C., Škopek, M., Ulrych, B.
  • Publikace: COMPEL. 2002,(1), 20-23. ISSN 0332-1649.
  • Rok: 2002

Modelování indukčního ohřevu kovových materiálů a souvisejících technologických procesů, část II

  • Autoři: prof. Ing. Ivo Doležel, CSc., Šolín, P., Ulrych, B., Škopek, M., Barglik, J.
  • Publikace: Elektro. 2002, 12(1), 4-7. ISSN 1210-0889.
  • Rok: 2002

Nagrzewanie indukcyjne w procesie termoelastycznego mocowania narzedzi maszynowych

  • Autoři: Barglik, J., prof. Ing. Ivo Doležel, CSc., Ulrych, B.
  • Publikace: Zeszyty Naukowe Politechniki Świetokrzyskiej. 2002,(1), 17-24.
  • Rok: 2002

Non-Isothermic Stirring of Molten Metal in Crucible Furnace as a Coupled Magnetohydrodynamic Problem

  • Autoři: Barglik, J., prof. Ing. Ivo Doležel, CSc., Škopek, M., Ulrych, B.
  • Publikace: KOMPEI'2002. Silesian University of Technology, 2002. pp. K. ISBN 83-7335-062-4.
  • Rok: 2002

Numerical Solution of Induction Heating of Ferromagnetic Cylinder by Moving Inductor

  • Autoři: Barglik, J., prof. Ing. Ivo Doležel, CSc., Šolín, P., Ulrych, B.
  • Publikace: CPEE'2002. Warsaw University of Technology, 2002. pp. 40-43.
  • Rok: 2002

On a Fieldless Method for the Computation of Induction Generated Heat in 3D Non-Ferromagnetic Metal Bodies

  • Autoři: prof. Ing. Ivo Doležel, CSc., Šolín, P., Ulrych, B.
  • Publikace: Mathematics and Computers in Simulation. 2002,(1), 20-23. ISSN 0378-4754.
  • Rok: 2002

Simulace indukčního ohřevu

Software for Computer Modelling of Simultaneous Induction Hardening

  • Autoři: Barglik, J., prof. Ing. Ivo Doležel, CSc., Ulrych, B.
  • Publikace: ZKWE'2002. Poznan: Wydawnictvo Institutu Elektrotechniki Przemyslovej Politechniki Poznanskej, 2002. p. 565-568. ISBN 83-912306-2-7.
  • Rok: 2002

Static Characteristic of a Small Linear Servomotor and Possibilities of Its Influencing

  • Autoři: Barglik, J., prof. Ing. Ivo Doležel, CSc., Škopek, M., Ulrych, B., Vostracký, Z.
  • Publikace: Micromachines'2002. Warszawa: Politechnika Warszawa, 2002. p. 149-155. ISBN 83-900768-8-8.
  • Rok: 2002

3D Analysis of Coupled Quasi-Stationary Electromagnetic and Non-Stationary Temperature Fields in Non-Magnetic Inductively Heated Charge

  • Autoři: Barglik, J., prof. Ing. Ivo Doležel, CSc., Šolín, P., Ulrych, B.
  • Publikace: Zeszyty Naukowe Politechniki Lodzkiej, ELEKTRYKA 97. 2001, 9-16. ISSN 0374-4817.
  • Rok: 2001

Active and Mutual Protection of Telecommunication Cables against External Electromagnetic Fields

  • Autoři: Ulrych, B., prof. Ing. Ivo Doležel, CSc., Škopek, M.
  • Publikace: APET'2001. Lviv: University of Technology, 2001. pp. 184-189.
  • Rok: 2001

Computer Modelling of Induction Hardering

  • Autoři: Barglik, J., prof. Ing. Ivo Doležel, CSc., Ulrych, B.
  • Publikace: ISTEE'01. Linz: Technical University of Linz, 2001. pp. 81-86. ISBN 3-9501491-0-4.
  • Rok: 2001

Coupled Electromagnetic - Thermal Investigation of Power Semiconductor Devices

Design of Inverter-Fed Induction Motor Drive Systems with Regard to EMC Problems

Dynamic Characteristic of Combined Actuators

  • Autoři: prof. Ing. Ivo Doležel, CSc., Jaskovská, M., Škopek, M., Ulrych, B.
  • Publikace: ISEF'01. Lodz: Technical University of Lodz, 2001. pp. 227-232. ISBN 83-89003-05-8.
  • Rok: 2001

Effect of Machine Geometry on Higher Harmonic Content in Air-Gap Magnetic Field of Synchronous Reluctance Machines

  • Autoři: Schreier, L., Chomát, M., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: Zeszyty Naukowe Politechniki Slaskiej,ELEKTRYKA. 2001, 265-266. ISSN 0072-4688.
  • Rok: 2001

Electromagnetic Fields Produced by Power Overhead Lines and Their Environmental Aspects

Elektromagnetické pole v blízkosti vedení vvn obecné konfigurace a možnosti jeho optimalizace

  • Autoři: Trefný, J., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: Elektroenergetika 2001. Košice: TU Košice, FEI, 2001. pp. 113-116. ISBN 80-88922-34-8.
  • Rok: 2001

Heating of Tubular Conductor Carrying Time Variable Current Formulated as Hard-Coupled Problem

  • Autoři: Škopek, M., Vostracký, Z., prof. Ing. Ivo Doležel, CSc., Ulrych, B.
  • Publikace: ELEKTRO'2001. Žilina: University of Žilina, 2001. pp. 198-201. ISBN 80-7100-836-2.
  • Rok: 2001

High Frequency Induction Drying of Axi-Symmetric Metal Bodies

  • Autoři: Barglik, J., prof. Ing. Ivo Doležel, CSc., Šolín, P., Ulrych, B.
  • Publikace: AMTEE'01. Plzeň: Západočeská universita, 2001. pp. A01-A06.
  • Rok: 2001

Improved Mathematical Model of Induction Heating of Ferromagnetic Cylinder

  • Autoři: Barglik, J., prof. Ing. Ivo Doležel, CSc., Šolín, P., Ulrych, B.
  • Publikace: ZKWE'01. Poznan: Wydawnictvo Institutu Elektrotechniki Przemyslovej Politechniki Poznanskej, 2001. pp. 423-426. ISBN 83-912306-1-9.
  • Rok: 2001

Induction Heating and Consequent Hardering of a Ferromagnetic Cylinder in Various Cooling Media

  • Autoři: Barglik, J., prof. Ing. Ivo Doležel, CSc., Ducki, K., Ulrych, B.
  • Publikace: SPETO'01. Ustron: Institut Elektrotechniki Teoretycznej i Przemyslowej Politechniki Slaskej, 2001. pp. 39-42. ISBN 83-85940-23-5.
  • Rok: 2001

Induction Heating of Thin Slabs in Nonmagnetic Media

  • Autoři: Šolín, P., prof. Ing. Ivo Doležel, CSc., Škopek, M., Ulrych, B.
  • Publikace: Lecture Notes in Computational Science and Engineering. 2001, 18(8), 379-386. ISSN 1439-7358.
  • Rok: 2001

Influence of Magnetic Circuit of Synchronous Reluctance Machine on Harmonic Content in Electrical Quantities

  • Autoři: Schreirer, L., Chomát, M., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: Symposium at 20th September 2001 in Prague. Praha: AV ČR, 2001. pp. 51-59.
  • Rok: 2001

Integral Mathematical Model of Induction Heating of Thick Nonmagnetic Plates

  • Autoři: Šolín, P., prof. Ing. Ivo Doležel, CSc., Škopek, M., Ulrych, B.
  • Publikace: International Seminar on Heating by Internal Sources. Padova: Universita degli Studi di Padova, 2001. pp. 183-190. ISBN 88-86281-64-1.
  • Rok: 2001

Mathematical and Computer Modelling of Induction Hardering

  • Autoři: Barglik, J., prof. Ing. Ivo Doležel, CSc., Škopek, M., Ulrych, M.
  • Publikace: Acta Technica CSAV. 2001, 46(3), 227-250. ISSN 0001-7043.
  • Rok: 2001

Mathematical and Computer Modelling of Induction Heating and Consequent Hardering of Cilcular Saw

  • Autoři: Barglik, J., prof. Ing. Ivo Doležel, CSc., Ducki, K., Ulrych, B.
  • Publikace: ISEF'01. Lodz: Technical University of Lodz, 2001. pp. 513-518. ISBN 83-89003-05-8.
  • Rok: 2001

Modelling of Induction Heating and Consequent Hardering of Long Prismatic Bodies

  • Autoři: Barglik, J., prof. Ing. Ivo Doležel, CSc., Sajdak, C., Škopek, M.
  • Publikace: International Seminar on Heating by Internal Sources. Padova: Universita degli Studi di Padova, 2001. pp. 511-518. ISBN 88-86281-64-1.
  • Rok: 2001

Modelování indukčního ohřevu kovových materiálů a souvisejících technologických procesů

  • Autoři: prof. Ing. Ivo Doležel, CSc., Šolín, P., Ulrych, B., Škopek, M., Barglik, J.
  • Publikace: Elektro. 2001, 11(12), 6-8. ISSN 1210-0889.
  • Rok: 2001

Optimalizace indukčního ohřevu krátkého feromagnetického válce z hlediska požadavku rovnoměrného prohřátí

  • Autoři: prof. Ing. Ivo Doležel, CSc., Škopek, P., Ulrych, B.
  • Publikace: Elektroenergetika 2001. Košice: TU Košice, FEI, 2001. pp. 169-172. ISBN 80-88922-34-8.
  • Rok: 2001

Optimised Regime of Induction Heating of a Disk before Its Pressing on Shaft

  • Autoři: Škopek, M., Ulrych, B., prof. Ing. Ivo Doležel, CSc.,
  • Publikace: IEEE Transactions on Magnetics. 2001, 37(5), 3380-3383. ISSN 0018-9464.
  • Rok: 2001

Stationary Temperature Field Produced by External Harmonic Electromagnetic Field in Non-Ferromagnetic Thick Metal Slabs

  • Autoři: Šolín, P., prof. Ing. Ivo Doležel, CSc., Škopek, M., Ulrych, B.
  • Publikace: SPETO'01. Ustron: Institut Elektrotechniki Teoretycznej i Przemyslowej Politechniki Slaskej, 2001. pp. 143-146. ISBN 83-85940-23-5.
  • Rok: 2001

Vnitřní, vnější a vzájemná ochrana sdělovacích kabelů vůči vnějšímu elektromagnetickému poli

  • Autoři: prof. Ing. Ivo Doležel, CSc., Krasl, M., Ulrych, B.
  • Publikace: Elektroenergetika 2001. Košice: TU Košice, FEI, 2001. pp. 105-108. ISBN 80-88922-34-8.
  • Rok: 2001

Za stránku zodpovídá: Ing. Mgr. Radovan Suk