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National Repository of Grey Literature

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	The Vibrattion Measurement Methods of the Engineering Components under Rotation Budek, P. ; Chmelíček, M. ; Jehlička, Vladimír The paper describes vibration measurement methods under rotation of mounted wheels and steam turbine blades and signal transfer from rotating components to evaluation devices. The aothors devote to solution of radio telemetric transfer signal problems in the paper. Detailed record
	The Prediction of Noise and Vibration through the Use of Software Means Budek, P. ; Chmelíček, M. ; Jehlička, Vladimír The report describes the process of building a model of vehicles and prediction of noise path on the basic of Statistical Energy Analysis. The report emphasizes legislative needs, which ask for the lowestlevel of noise pollution inside and outside of public transportation vehicles. Detailed record
	Zjednodušené 2D zobrazení elektromagnetického pole pohonu s indukčním motorem Nečesaný, Jakub ; Škramlík, Jiří ; Jehlička, Vladimír This work is focused on magnetic field modeling and analysis inside and outside the trolley bus 21 TR. Computation is carried out for application of two different power switching semiconductor devices. Influence on environment and near low-current and telecommunication systems is evaluated. Local maximum of magnetic field and the geometrical convergence is also determined. The results are discussed with the corresponding standards and concretemeasurement on the vehicle. Detailed record
	Undesirable Noise Phenomena Generated by Semiconductor Converters Budek, P. ; Chmelíček, M. ; Jehlička, Vladimír The broad use of modern semiconductor converters, whose outstanding features are steep increase in current and switching frequency usually in the range 2 to 3 kHz, often incurs undesirable noise phenomena in electric drives used in vehicles of city mass transportation. The presented paper is focused on locating the sources of noise and on its transportation to the interior of the vehicle. Detailed record
	Computing Methods of Noise, Vibration and Electromagnetic Waves Diffusion Budek, P. ; Jehlička, Vladimír ; Nečesaný, Jakub The paper deals with the utilization of SW means for the predition of noise and electromagnetic emission in vehicles of city mass transportation. It also compares the results of experimental measurements with the results obtained through mathematical simulations and modeling. Detailed record
	Computation Simulation of Noise and Electromagnetic Waves in City Mass Transport Vehicles Budek, P. ; Chmelíček, M. ; Jehlička, Vladimír ; Nečesaný, Jakub New problems emerge in the vehicles of city mass transportation due to the development, change of the some structure or application of the new devices. These problems are noise, vibration and electromagnetic interference. They were aimed at finding their sources, at verifying their influence and finding methods for their limitation. Detailed record
	Prediction of Propagation of Noice and Electromagnetic Waves in Vehicles of Mass Transportation Budek, P. ; Chmelíček, M. ; Jehlička, Vladimír News problems emerge in the vehicles of city mass transportation due to the development, change of the some structure or application of the new devices. These problems are noise, vibration and electromagnetic interference. They were aimed at finding their sources, at verifying their influence and finding methods for their limitation. Detailed record
	Overvoltage Phenomena and Electromagnetic Interference Produced by Voltage Source Inverter with IGCT Switching Devices Škramlík, Jiří ; Bartoš, Stanislav ; Jehlička, Vladimír The paper summarized experience optained from an IGCT - inverter operating under laboratory conditions as well as in city mass transport vehicles. Overvoltage phenomena arising between the inverter and the supplied induction motor, the influence of the used cables, and the EMC are discussed. Finally, a comparison of EMI produced by IGCT and IGBT converters is given. Detailed record
	Noise, vibration and electromagnetic phenomena produced by semiconductor converters in traction vehicles Budek, P. ; Chmelíček, M. ; Jehlička, Vladimír ; Škramlík, Jiří Due to the recent employment of up-to-date control electronic and electromechanical devices in cars of City Mass Transportation, new problems arise concerning the dynamics, noise, and the radiation of electromagnetic fields. Their environmental impacts, however, have not been discussed sufficiently, so far. Detailed record
	Electromagnetic emissions of a trolley-bus with IGCT-based drive Doležel, Ivo ; Jehlička, Vladimír ; Škramlík, Jiří ; Valouch, Viktor The paper describes utilisation of a new IGCT-based element in DC inverter designed for feeding of a DC traction motor for trolley-bus. It deals with emissions of electromagnetic field (EMI) produced by operation of the inverter EMI was measured and calculated on a simplified model. Realised was a preliminary best during a low-speed trip within frequency range 150 kHz - 30 MHz. The results exhibit a good accordance with European Standards EN 50121-2, EN 50121-3-1. Detailed record

National Repository of Grey Literature : 17 records found   1 - 10  jump to record:

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1	Jehlička, Václav

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