Lidé

Ing. Tomáš Drábek, Ph.D.

Všechny publikace

The Improved Automatic Control Points Computation for the Acoustic Noise Level Audits

  • DOI: 10.21014/acta_imeko.v10i3.1067
  • Odkaz: https://doi.org/10.21014/acta_imeko.v10i3.1067
  • Pracoviště: Katedra měření
  • Anotace:
    The acoustic noise level in the interior is one of the quantities specified by a standard and is subject to audits to ensure a comfortable living environment. Currently, the noise level audits are performed manually by a skilled operator, who evaluates the floor plan and uses it to calculate the control points location in which the measurement is performed. The computation is proposed to automate the audit by formulating an optimisation problem for which an algorithm was designed. The algorithm computes the solution that satisfies all constraints specified in the standard, for example, the minimum distance among the control points and fixed obstacles (walls or columns). In the proposed optimisation problem, the fitness function was designed based on the measurement purpose, and two typical use-cases were analysed: (i) long-term stationary noise measurement and (ii) recurring short-term noise measurement. Although the set of control points for both use cases complies with the given standard, it is beneficial to distinguish the location of control points based on the measurement purpose. The number of control points is maximised for the stationary noise and for the immediate coverage area for the short-term noise. The proposed algorithms were tested in a simulation for several floor plans of different complexity.

Automatic Control Points Computation for the Acoustic Noise Level Audits

  • Autoři: Ing. Tomáš Drábek, Ph.D., Petrík, V., prof. Ing. Jan Holub, Ph.D.,
  • Publikace: 17th IMEKO TC 10 and EUROLAB Virtual Conference: “Global Trends in Testing, Diagnostics & Inspection for 2030”. Warsaw: IMEKO TC10, 2020. p. 374-379. ISBN 978-92-990084-6-1.
  • Rok: 2020
  • Pracoviště: Katedra měření
  • Anotace:
    The acoustic noise level in the interior is one of the quantities specified by a standard and is subject to audits to ensure a comfortable living environment. Currently, the noise level audits are performed manually by a skilled operator, who estimates the floor plan and uses it to calculate the control points location in which the measurement is performed. We propose to automate the computation by formulating an optimization problem for which we designed an algorithm. Algorithm computes the solution that satisfies all constraints specified in the standard, for example, the minimum distance among the control points and fixed obstacles (walls or columns). In the proposed optimization problem, we designed the fitness function based on the measurement purpose, and we analysed two typical use-cases: (i) long-term stationary noise measurement and (ii) recurring short-term noise measurement. Although the set of control points for both use cases obeys the given standard, it is beneficial to distinguish the location of control points based on the measurement purpose. We maximize the number of control points for the stationary noise and maximize the immediate coverage area for the short-term noise. We tested the proposed algorithms in simulation for several floor plans of different complexity.

Statistical-Based Control Points Selection for Indoor Illuminance Measurement

  • DOI: 10.1109/TIM.2020.2987635
  • Odkaz: https://doi.org/10.1109/TIM.2020.2987635
  • Pracoviště: Katedra měření
  • Anotace:
    The distribution of indoor illuminance affects the health and the performance of humans, and is therefore subject to audits. Audits are performed after each modification of the light sources, and the currently adopted approach uses a human operator to perform measurements manually. This process is time-consuming, and we therefore aim to automate it with a mobile platform. In order to automate the process, we propose an online algorithm for selecting the control points. The algorithm is iterative, and it takes previous measurements into account in order to select the control points adaptively. We show how the proposed method can be combined with a mobile platform to perform the audit autonomously. Initially, the mobile platform, equipped with a laser range finder, is used to build the floor plan of the room. This floor plan is then used to restrict the area within which the control points can be selected. The whole measurement process is then executed without the presence or the intervention of a human operator, and this reduces the time needed for the audit. We have performed simulated and real experiments to demonstrate the performance of the proposed approach.

The new subject at the Czech Technical University in Prague: laboratories of industrial electronics and sensors

  • DOI: 10.1117/12.2530690
  • Odkaz: https://doi.org/10.1117/12.2530690
  • Pracoviště: Katedra měření
  • Anotace:
    The subject of the Industrial Electronics and Sensors Laboratory has been designed to be focused on the practical part of the teaching. Here we describe its concept, used equipment and task examples. Experience gathered during subject first run is reported, including final students’ feedback.

Low Bit-rate Coded Speech Intelligibility Tested with Parallel Task

  • DOI: 10.3813/AAA.919207
  • Odkaz: https://doi.org/10.3813/AAA.919207
  • Pracoviště: Katedra měření
  • Anotace:
    A speech intelligibility test in realistic environments has been designed and performed deploying 51 subjects. A single set of speech samples distorted by various background noises and low bit-rate coding techniques has been used - without and with additional (parallel) psychomotor tasks. The addition of psychomotor tasks to the test simulates realistic environments. The differences in intelligibility test results between standard laboratory and parallel task test methodology were identified. Overall, the intelligibility of regular tests was mainly higher than for tests with a parallel task. Intelligibility results of certain samples have been found counterintuitive, which is possibly explained by a different mode of thinking under parallel task conditions.

Subjective Testing of Car Audio Systems With and Without Parallel Task

  • Pracoviště: Katedra měření
  • Anotace:
    This contribution presents a comparison between listening tests that were conducted in two different simulated listening situations: listening only in a stationary, parked car and listening while driving a (simulated) car. In both tests, identical signals and identical playback configurations were used leaving the situation as only variable in the test.

Prototype of Automated Device for Measurement of a Light Vector

  • Autoři: Ing. Tomáš Drábek, Ph.D., Avetisyan, H.
  • Publikace: Proceedings of the 20th International Scientific Student Conferenece POSTER 2016. Praha: Czech Technical University in Prague, 2016. ISBN 978-80-01-05950-0.
  • Rok: 2016
  • Pracoviště: Katedra měření
  • Anotace:
    The goal of this report is to show the progress we achieved in the field of autonomous indoor light quantities measurement. The novelty of this project is to show the prototype of automated device for measurement of a light vector. At the beginning of the paper the theoretical analysis of quantity measurement is shown and what it is used for. It is followed by the state of the art of the measurement methodology. Next, the new measuring equipment’s design and its description are shown. The rest of the paper describes the edited algorithm for measurement process.

The Innovation of the Autonomous System for Indoor Illuminance

  • Autoři: Ing. Tomáš Drábek, Ph.D., prof. Ing. Jan Holub, Ph.D.,
  • Publikace: Proceedings of the 21st International Conference LIGHT SVĚTLO 2015. Brno: Brno University of Technology, FEEC, Department of Electrical Power Engineering, 2015, pp. 273-276. ISBN 978-80-214-5244-2.
  • Rok: 2015
  • Pracoviště: Katedra měření
  • Anotace:
    The goal of this report is to show the results we achieved in the field of autonomous indoor illuminance measurement. At the beginning of the paper the state of the art measurement methodology is shown. It is followed by the description of the robotic unit we designed for the purpose of automation of the measurement process. Moreover, the algorithm for measurement process is described in detail. The rest of the paper deals with possible improvements of the robotic platform mainly by adding new sensors and by adding the illuminance vector measurement unit.

Robotická jednotka pro měření osvětlenosti v interiérech

  • Pracoviště: Katedra elektroenergetiky, Katedra měření
  • Anotace:
    Měření osvětlenosti v síti kontrolních bodů je nejčastěji používanou metodou vyhodnocování parametrů osvětlovacích soustav interiérů jak státními dozorovými orgány (např. krajské hygienické stanice), tak soukromými subjekty, které se zabývají projekční činností v oblasti osvětlovacích soustav. Měřením lze ověřit požadavky na osvětlovací soustavy dané českými technickými normami. Měření osvětlenosti dosud probíhá manuálně, tj. vytyčením sítě kontrolních bodů a následně provedením měření osvětlenosti luxmetrem v každém z kontrolních bodů. Jednou z možností, jak zajistit značné urychlení zdlouhavého procesu měření osvětlenosti v interiérech, je automatizace procesu měření s využitím robotické jednotky, která by byla schopna sama vytýčit síť kontrolních bodů dle požadavků norem a současně s vytyčováním sítě kontrolních bodů provést měření osvětlenosti v této síti.

Automatizované měření osvětlenosti v interiéru

  • Pracoviště: Katedra elektroenergetiky
  • Anotace:
    Jednou ze základních metod hodnocení kvality osvětlovacích soustav v interiérech je měření horizontální osvětlenosti. Jedná se o ruční měření hodnot osvětlenosti v rovnoměrné síti kontrolních bodů. V praxi se často provádějí měření ověřovací, ať už na straně projektanta, nebo z podnětu hygienických stanic. Taková měření bývají vzhledem k velkému počtu kontrolních bodů (měření často probíhá ve více místnostech sledovaného objektu) časově náročná, přičemž v jejich průběhu se v každém kontrolním bodě opakuje stejný úkon. Z tohoto důvodu bylo v rámci mezifakultního studijního oboru Inteligentní budovy na ČVUT vypsáno téma studentského projektu, jehož cílem je popsat možnosti automatizace tohoto procesu tak, aby došlo k urychlení měření.

Za stránku zodpovídá: Ing. Mgr. Radovan Suk