AEEE. 2004, vol. 3
Permanent URI for this collectionhttp://hdl.handle.net/10084/83545
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Item type: Item , Poznámka k metodike merania útlumu akustických vĺn v tuhých látkach(Žilinská univerzita v Žiline. Elektrotechnická fakulta, 2004) Sidor, Peter; Vajda, DrahoslavItem type: Item , Tvorba nových služieb(Žilinská univerzita v Žiline. Elektrotechnická fakulta, 2004) Cigánek, Peter; Hudec, RóbertItem type: Item , Biologické účinky elektromagnetického poľa(Žilinská univerzita v Žiline. Elektrotechnická fakulta, 2004) Cabanová, ZuzanaItem type: Item , Mobilný obchod, Quo vadis?(Žilinská univerzita v Žiline. Elektrotechnická fakulta, 2004) Hudec, Róbert; Cigánek, PeterItem type: Item , Numerické metódy – I(Žilinská univerzita v Žiline. Elektrotechnická fakulta, 2004) Maga, DušanItem type: Item , Matematicko-grafická formalizácia činnosti riadiaceho obvodu výhybky(Žilinská univerzita v Žiline. Elektrotechnická fakulta, 2004) Ždánsky, Juraj; Rástočný, KarolItem type: Item , Veda je súčasťou kultúry(Žilinská univerzita v Žiline. Elektrotechnická fakulta, 2004) Turek, IvanItem type: Item , The crane robust control(Žilinská univerzita v Žiline. Elektrotechnická fakulta, 2004) Hičár, MarekThe article is about a control design for complete structure of the crane: crab, bridge and crane uplift. The most important unknown parameters for simulations are burden weight and length of hanging rope. We will use robust control for crab and bridge control to ensure adaptivity for burden weight and rope length. Robust control will be designed for current control of the crab and bridge, necessary is to know the range of unknown parameters. Whole robust will be split to subintervals and after correct identification of unknown parameters the most suitable robust controllers will be chosen. The most important condition at the crab and bridge motion is avoiding from burden swinging in the final position. Crab and bridge drive is designed by asynchronous motor fed from frequency converter. We will use crane uplift with burden weight observer in combination for uplift, crab and bridge drive with cooperation of their parameters: burden weight, rope length and crab and bridge position. Controllers are designed by state control method. We will use preferably a disturbance observer which will identify burden weight as a disturbance. The system will be working in both modes at empty hook as well as at maximum load: burden uplifting and dropping down. For uplift drive we will use an asynchronous motor fed from frequency converter. Simulations are proposed for situation that firstly we do uplift and then switching block realize simultaneous crab and bridge motion. At simulations it is possible to choose different burden weight, rope length, crab and bridge positions and speeds.Item type: Item , Technológia elektronického podpisu(Žilinská univerzita v Žiline. Elektrotechnická fakulta, 2004) Schwartz, Ladislav; Trstenský, Dušan; Sádovský, JaroslavItem type: Item , Vplyv elektromagnetického poľa vyžarovaného mobilnými telefónmi na ľudský organizmus(Žilinská univerzita v Žiline. Elektrotechnická fakulta, 2004) Darmová, Vilibalda; Ryčeková, HelenaInteraction of electromagnetic field with biological objects, especially with human body is a frequently asked question of these days. To investigate the electromagnetic fields both theoretical and experimental methods have been used. Mobile phones and their base stations belong to the most widely spread sources of EM field. That is the reason for investigation of their impact on human organism.Item type: Item , Informačný prístup k analýze bezpečnosti zabezpečovacích systémov(Žilinská univerzita v Žiline. Elektrotechnická fakulta, 2004) Hanusová, Naděžda; Zahradník, JiříItem type: Item , Verifikácia vlastností synchrónneho ATM multiplexora(Žilinská univerzita v Žiline. Elektrotechnická fakulta, 2004) Žabka, JánItem type: Item , Povrchové javy na trojfázových vedeniach nízkoohmových pecí(Žilinská univerzita v Žiline. Elektrotechnická fakulta, 2004) Novák, PavelItem type: Item , Prechodné stavy telekomunikačnej siete(Žilinská univerzita v Žiline. Elektrotechnická fakulta, 2004) Súlovec, Andrej; Čepčiansky, GustávItem type: Item , Riadenie dynamických systémov použitím Q-učenia(Žilinská univerzita v Žiline. Elektrotechnická fakulta, 2004) Filasová, Anna; Klacik, Juraj; Kašprišin, JánItem type: Item , Ansys analysis of weakly magnetic materials in MR tomography(Žilinská univerzita v Žiline. Elektrotechnická fakulta, 2004) Steinbauer, Miloslav; Bartušek, KarelThe paper deals with the impact of weakly magnetic materials on magnetic field in MR tomography. The results obtained by finite element method modelling as well as data measured by MR tomography are introduced. Method of magnetic susceptibility determination using MRI is discussed.Item type: Item , Propagation of partial discharge pulses in winding(Žilinská univerzita v Žiline. Elektrotechnická fakulta, 2004) Záliš, KarelA lot of measurements of the attenuation of partial discharge pulses on the model of winding was realized in the High Voltage Laboratory of the Czech Technical University in Prague. Current pulses from a charge calibrator were injected into different parts of winding and both the distortion of the charge and their deformations at the end terminals were observed and evaluated. It was confirmed that the apparent charge of a partial discharge, as a diagnostic parameter, is not relatively very sensitive, comparing to other diagnostic parameters, e.g. to the size or the shape of a partial discharge current pulse. The charge of the partial discharge current pulse on terminals was integrated by means of three different methods. It was found that the attenuation of the partial discharge pulse is significant. It was confirmed by all three evaluating methods with similar results. Furthermore, a measurement both of the attenuation of pulse and changes of partial discharge charge was realized on different types of winding. It resulted in the fact that the attenuation of the partial discharge charge on different types of winding depends on the winding parameters.Item type: Item , A novel approach to robust motion control of electrical drives with model order uncertainty(Žilinská univerzita v Žiline. Elektrotechnická fakulta, 2004) Dodds, Stephen J.A novel approach to the control of plants with model order uncertainty as well as parametric errors and external disturbances is presented, which yields a specified settling time of the step response with zero overshoot. The method is applied to a motion control system employing a permanent magnet synchronous motor. A single controller is designed to cater for mechanical loads that may exhibit significant vibration modes. The order of the complete controlled system (i.e., the plant) will therefore depend on the number of significant vibration modes. The controller is of the cascade structure, comprising an inner drive speed control loop and an outer position control loop. The main contribution of the paper is a completely new robust control strategy for plants with model order uncertainty, which is used in the outer position control loop. Its foundations lie in sliding mode control, but the set of output derivatives fed back extend to a maximum order depending on the maximum likely rank of the plant, rather than its known rank. In cases where the maximum order of output derivative exceeds the plant rank, in theory, virtual states are created that raise the order of the closed-loop system while retaining the extreme robustness properties of sliding mode control. Algebraic loops (caused by zero or negative rank of the open-loop system) are avoided by embodying filtering with a relatively short time constant in the output derivative approximations. The speed control loop is also new. Although it is based on the forced dynamic vector control principle, already developed by the author and co-researchers for drives with current fed inverters, for the first time, a version for voltage fed inverters is presented with a view to future implementation of space vector modulation to improve the smoothness of the stator current waveforms. The new forced dynamic control law requires an estimate of the load torque and its first derivative and a special observer is presented for this purpose. An initial evaluation of the method is made by considering three plants with different orders and ranks, the first being the unloaded drive, the second being the drive controlling the motor rotor angle with a mass-spring load attached and the third being the drive controlling the load mass angle of the same attached mass-spring load. The simulations indicate that the control system does indeed yield robustness including plant order uncertainty and further investigations, both theoretical and experimental, are recommended.Item type: Item , Problémy súvisiace s používaním niektorých pojmov pri analýze bezporuchovosti systémov(Žilinská univerzita v Žiline. Elektrotechnická fakulta, 2004) Hanusová, Naděžda; Zahradník, JiříItem type: Item , Snímanie silových deformácií autopláštov taktilnými piezorezistívnymi snímačmi(Žilinská univerzita v Žiline. Elektrotechnická fakulta, 2004) Hurta, Ferdinand