National Repository of Grey Literature 91 records found  beginprevious31 - 40nextend  jump to record: Search took 0.01 seconds. 
Questions of dimensioning grid filter for PWM rectifier
Šimek, Petr ; Škramlík, Jiří ; Valouch, Viktor
Properties and behavior of L and LCL grid filters for PWM rectifiers in terms of grid current harmonic spectra are analyzed in the paper. A procedure how to determine filter parameters is presented and comparison of the filters done by using programs developed.
Porovnání usměrňovače s šířkově pulzní modulací s usměrňovačem fázově řízeným
Lettl, Jiří
The presented paper deals with measured waveforms of realized PWM rectifier with practically sinusoidal input current and controllable phase shift between input current first harmonic and supply voltage first harmonic. Electromagnetic compatibility of PWM rectifier and classical phase controlled rectifier is compared on the basis of the input current harmonic analysis.
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.
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.
Definice parametrů náhradního schématu a výpočet elektromagnetického pole asynchronního stroje
Skalka, Miroslav ; Ondrůšek, Č. ; Schreier, Luděk
This paper deals with mathematic and graphic description of non-linearity parameters of induction machine (IM) equivalent circuit due to measured data: no-load, short-circuit and load test. The real values of rotor currents in each of rotor bar for these parameters are calculated. This paper also contains calculation of electromagnetic field distribution by finite element method in ANSYS.
Indukční ohřev dlouhých hliníkových ingotů v homogenním magnetickém poli
Donátová, M. ; Karban, P. ; Doležel, Ivo
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.
Využití MHD čerpadel tekutých kovů pro chlazení vysokoteplotních jaderných reaktorů
Doležel, Ivo ; Donátová, M. ; Karban, P. ; Ulrych, B.
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 nu-clear reactors of the fourth generation.
Sdružené úlohy v silnoproudých aplikacích
Doležel, Ivo ; Karban, P. ; Šolín, Pavel ; Ulrych, B.
The paper presents several typical coupled problems in power engineering applications, show their mathematical and computer models, discuss the possibilities of their numerical solution and illustrate them on particular examples.
Modelování a implementace trojfázového úsporného zapojení PWM měniče
Šimek, Petr ; Škramlík, Jiří ; Valouch, Viktor ; Klíma, J.
The mathematical model and description of the three-phase four-switch converter aimed at compensating reactive power is proposed. A mixed p-z approach based on integral transformations (the Laplace and Modified Z-transform) is used for obtaining solution in a closed-form. The analytical procedure is verified by experimental results.

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