National Repository of Grey Literature 91 records found  beginprevious72 - 81next  jump to record: Search took 0.02 seconds. 
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.
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.
Nové metody záznamu chování volného proudu plazmatu užívající vláknovou optiku
Šonský, Jiří ; Hlína, Jan ; Něnička, Václav
The fibre optics coupling to photodiodes used in plasma jets optical radiation recording enables us to increase the channel count and to add flexibility to an experimental layout for multi-directional observations. These improvements give us opportunity of more detailed and important plasma jets behaviour analysis - reconstruction of luminosity fields (close to relative value of enthalpy) in planes perpendicular to a plasma jet axis, velocities and tracking of plasma jet axis movements. Details of experimental hardware and layount will be also shortly presented.
Poznámky k nelineárnímu chování vektoru toku tepla pro dynamické režimy ve volném proudu plazmatu
Něnička, Václav ; Šonský, Jiří ; Pekárek, Viktor
The kinetic theory of mixtures of gases [5] along with the thermodynamic definition for the heat vector in extended non-linear thermodynamics [4] are used to process the experimental data obtained by observing the effects typical for evolution of the heat vector vorticity in dynamical regimes in plasma jets [6]. The results of modeling the vorticity fields are based on a new method of measuring the radiation intensity [3].
Control strategie of shunt active filters
Paclt, Zdeněk ; Valouch, Viktor
The paper deals with possible control strategies of the shunt active power filter. This paper describes advantages and disadvantages and basic principles of the passive and active power filters. Simulation results are presented to validate the control strategies.
Integrální přístup k řešení neferomagnetického elektrodynamického akcelerátoru
Karban, P. ; Doležel, Ivo
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 determination of eddy currents in the launched body based on the integral 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
Vybrané procesy v tekutých kovech řízené elektromagnetickým polem a jejich počítačová simulace
Mach, M. ; Doležel, Ivo
The paper presents some important results obtained by the authors during the three-year work in the domain of electromagnetic stirring and levitation melting. From the viewpoint 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
Nulová složka v třífázových asynchronních motorech
Schreier, Luděk ; Chomát, Miroslav
The paper deals with such a case of influence of zero-sequence component on the induction machine when this component arises due to connection of the stator winding neutral with the feeding source. The relationship between the zero-sequence component and the third space harmonic of stator current layer is shower. Furthermore, the paper deals with the methods of suppressing the undesirable influence of the zero-sequence component on the induction motor, especially an increase of additional losses and a rise of parasitic torques.
Větvení obloukového kanálu ve vnějším magnetickém poli
Mrázek, Josef ; Hlína, Jan
An electric arc burning in mercury vapours exposed to external magnetic field changes its discharge path into a helix according to the Thomson principle of energy minimization. The voltage between the adjacent turns of the helix curvature may result in the critical electric field strenght in the vicinity of the arc channel, that leads to the branching and formation of a new discharge path acting as a turn-to-turn short. We have been interested in the electric field profile and surrounding parameters at the moment of branching, the speed of a new channel warming, temporal evolution of the restoration of a regular spiral channel, development of the arc current and distribution of the voltage between the series resistor and arc channel during the breakdown.
Měření rozdělení teplot ve volném proudu plazmatu CCD kamerou
Hlína, Jan ; Šlechta, Jiří ; Šonský, Jiří ; Gleizes, A. ; Gonzales, J. J. ; Cressault, Y.
The method is based on the application of a fast shutter colour CCD camera thet is able to provide simultaneous images of a plasma jet in different spectral regions. Both the experimental and theoretical results have shown that it is possible to apply the method to measurements of temperature fields in argon thermal plasma jets in the range 8000 - 11000 K. The ratio of red to blue components is preferable due to the steepest dependence on temperature.

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