National Repository of Grey Literature 5 records found  Search took 0.01 seconds. 
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.
Numerical Analysis of the Magnetic Field of the Trolley Bus
Nečesaný, Jakub ; Škramlík, Jiří
This work is focused on magnetic field modeling and analysis inside and outside the trolley bus 21Tr. Computation is carried out for various working regimes for application of two different power switching semiconductor devices. Influence on environment and near low-current and telecommunication systems is evaluated. Computation of the magnetic field is per-formed by a professional FEM-based program QUICKFIELD. Problems associated with numerical computation are discussed. Local maximum of the magnetic field is also determined.
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.
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.
Porovnání magnetického pole vně a uvnitř trolejbusu 21 Tr řízeného GTO nebo IGCT tyristorem
Nečesaný, Jakub ; Doležel, Ivo
This work is focused on the magnetic field modelling and analysis inside the trolley bus 21TR. Mathematical description is presented. Computation is carried out for accelerating regime for application of two different power switching semiconductor devices GTO and IGCT. Study of the magnetic field is done for head level of standing and sitting people. Local maximum of the magnetic field is also determined. Differences between magnetic field levels given by GTO and IGCT power switching semiconductor devices are consecrated. Finally, geometrical convergence of this problem is evaluated

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4 Nečesaný, Jaroslav
4 Nečesaný, Jiří
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