ELEKTRONIKA, ENERGETYKA, ELEKTROTECHNIKA ›
PRZEGLĄD ELEKTROTECHNICZNY ›
2007-II |
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A time-varying capacitance: control function of active power filters
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Kazimierz MIKOŁAJUK  Andrzej TOBOŁA
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This paper proposes new fixed switching frequency control techniques for power active filters. The method is based on an auxiliary
capacitance function. This function is equivalent to time-varying capacitance. Such capacitance function can be computed when reference signal is
known. The fixed switching frequency control techniques for PWM voltage source inverter can be easy obtained when the aux[...]
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Active source localization in 3D BEM multilayer model
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Konrad NITA
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Boundary Element Method for simulation of spatially heterogeneous objects of electroencephalography is presented in this paper. The
four layer spherical model (representing skin, skull, CSF layer and brain) of the real head approximated with isoparametric six nodes triangles was
consist. Forward and invers problem for active source localization was presented in this paper.
Streszczenie. W artyk[...]
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Ambiguity groups in linear dynamic analog circuit
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Piotr SIDYK
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The method for finding ambiguity groups in linear dynamic analog circuits is presented in the paper. This method is derived using
sensitivity of the circuit response in time and frequency domain. The sensitivity analysis of the circuit in time domain as well as in frequency domain
is performed with usage of the state-space description of the circuit.
Streszczenie. W referacie zaprezentowano met[...]
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Eddy currents induced in the screen of a non-coaxial cable
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Zygmunt PIĄTEK
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Expanding the logarithmic vector potential into Fourier series we determine the source magnetic field generated in the screened noncoaxial
cable as a function of two variables r and Θ of the cylindrical co-ordinate system. In the non-conducting areas, internal and external, the
electric field is described by Laplace equation, while in the conducting area by Helmholtz equation for two variab[...]
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Electrodes modeling in the copper electrocrystallization process
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Maria TRZASKA Anna Maria BIAŁOSTOCKA
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In the article will be presented usefulness of the computer-aided modeling of electrochemical technologies. Modeling of the electrolytic
surface deposits needs solutions of problems connected with current distribution in the electrolyte, with electrodes shape and composition of
electrochemical environments in which the process takes place. Adapted methodology is used to analyze the coating layer[...]
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Epileptic seizure detection using single-class SVM
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Bartosz ŚWIDERSKI Stanisław OSOWSKI Andrzej CICHOCKI
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The paper presents the application of single-class Support Vector Machine (SVM) for the detection of the epileptic seizure using the EEG
waveform. On the basis of the registered EEG signals the diagnostic features are generated first. These features are applied as the input signals to
the single-class SVM, serving as the classification tool. Single class SVM is learned using only the baseline se[...]
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Fast orthogonal neural networks for 2D signal processing
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Bartłomiej STASIAK Mykhaylo YATSYMIRSKYY
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The paper presents a method of constructing fast orthogonal neural networks suitable for two-dimensional data processing. The
neural connection scheme is based on a two-stage fast cosine transform algorithm. Two processing variants applicable to the proposed architecture
are discussed. A substantial acceleration of the learning process, as compared to a classical linear neural network, is demons[...]
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Finding parametric characteristics in diode-transistor circuits
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Stanisław HAŁGAS Michał TADEUSIEWICZ
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The paper is devoted to the analysis of transistor circuits having multiple DC solutions. A method for tracing multivalued parametric
characteristics expressing output signals in terms of some parameters is offered. The proposed approach utilizes the previously developed method
for finding all the DC solutions of circuits containing the Ebers-Moll modeled transistors and the Newton-Raphson algor[...]
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Generalized robust parameters distribution model
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Yuriy BOBALO Leonid NEDOSTUP Oxana LAZKO
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The quality and adequacy of mathematical models on base of Gram-Charlier and Edeworth rows was shown.In spite of great number of theoretical and .practical
investigation, that were made as in Ukraine as in the other
countries of the world in the area of analysis and synthesis
of electronic devices components parameters, present
methods, approaches and software are deficient of stateof-
the-ar[...]
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Level Set Method for capacitor optimization problem
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Magdalena STASIAK Przemysław BEROWSKI Jan SIKORA
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The optimal shape design of capacitor with Laplace equation of state using level set method is presented in the paper. The inverse
problem solution provides the positions of the capacitor plates, which was optimized to achieve required potential distribution. The forward problem
was approximated by Boundary Elements Method.
Streszczenie. W pracy przedstawiono rozwiązanie zadania odwrotnego dla [...]
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Mathematical model for M-phases switched reluctance motor
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Vasyl TKACHUK Lidiya KASHA
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The constructive schemes of switched reluctance motor and basic electrical scheme of a commutator with capacity buffers of energy are
circumscribed. Is explained a mathematical model to a research of electromechanical processes in electric drives with switched reluctance motor
with buffers of an energy.
Streszczenie. Artykuł prezentuje schematy konstrukcyjne silnika o przełączanej reluktancji i[...]
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Modeling of high currents dismountable contacts
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Ioan POPA Ioan CAUTIL Dan FLORICAU Florin OCOLEANU
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The paper presents an electro-thermal numerical model which can be used for the modelling and optimization of dismountable contacts of
high currents by neglecting the skin effect (by taking into account of the very large ratio, near to 10, of the dimensions of cross-section of the current
lead for which the skin effect is very weak). The numerical model is obtained by the coupling of the electro[...]
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Models of nonlinear one-ports supplied with periodic and discontinuous waveforms
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Piotr ŚWISZCZ
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Analysis of harmonics propagation in electrical systems requires information about nonlinear one-ports which are the main source of
harmonics. A method of determination of parameters of the model of one-port has been described in this article for periodical and discontinuous
excitations. This method has been developed assuming that mathematical description of a nonlinear one-port is known.
Stre[...]
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Optimal electric power flow computation
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Mariana DUMITRESCU Toader MUNTEANU Dan FLORICAU
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The paper proposes a comparative study of the Optimal Active Power Flow computation for a power delivery system. The main goal of the
paper is to use different Security models for Optimal Power Flow analysis for the case study. Some models allow power flow computing to obtain the
minimum total system generation cost. The comparative study, on the proposed power system, is done considering differ[...]
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Performance tuning of the ray tracing process running in a multi-processor environment
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Łukasz STELMACH
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Ray tracing is a way of creating photo-realistic images with a very accurate reflection and shadow mapping. Despite high
computational complexity of ray tracing, its work principle allows partitioning and dividing the job for parallel processing in quite simple
way. Theoretically every pixel may be computed separately by a different processor. Virtually each processor is assigned to computing a
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Positive discrete-time linear Lyapunov systems with delays
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Tadeusz KACZOREK Przemysław PRZYBOROWSKI
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The notion of positive discrete-time linear Lyapunov system with delays is introduced. Necessary and sufficient conditions for the positivity
and the asymptotic stability of this system are established. The necessary and sufficient conditions for reachability are given and the Cayley-
Hamilton theorem is extended for linear Lyapunov systems with delays. The considerations are illustrated on the [...]
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Procedures for matrix exponential function derivative in Matlab
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Lubomír BRANČÍK
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The paper deals with a few approaches how to determine a derivative of the matrix exponential function in the Matlab language. A
usefulness for such the computation appears in many branches of the electrical engineering when various simulation tasks are solved. A Taylor
series expansion, an augmented matrix utilization, an eigenvalues decomposition, a Laplace transform approach, a convolution in[...]
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Professor Tadeusz Cholewicki (1907-1988)
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Professor Tadeusz Cholewicki was born on October 23rd 1907 in Warsaw.
After finishing the grammar school he got a humanistic education. In 1925
Tadeusz Cholewicki entered the Mathematical Department of Warsaw
University and after graduating it in 1930 and his military service, he became a
student of the Electrical Department at Warsaw Technical University. Tadeusz
Cholewicki was qualified as [...]
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Steady state calculation of nonlinear circuits by the secants method
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Yaroslav SHMYGELSKY
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The effective variant of a secants method of solution of systems of the nonlinear algebraic equations is used for the steady state
calculation of the nonlinear dynamic systems. Efficiency of the developed algorithms is confirmed by the numerical experiments.
Streszczenie. W pracy przedstawiono wariant metody siecznych umożliwiający efektywne rozwiązywanie nieliniowych równań algebraicznych
otrz[...]
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The magnetic microsensors response
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Cornel PANAIT George CĂRUNTU
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This paperwork presents the structure, the operating conditions and the main features of some microsensors realised in the bipolar and
the MOS integrated circuits technology. By using numerical simulation, the values of the sensor response for the two analysed devices are
compared and it is also emphasized the way in which choosing the geometry and the material features allows getting high-perfo[...]
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The magnetic sensitive MOS structures
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George CARUNTU Cornel PANAIT
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In this paperwork based on the adequate models it is analysed the operating conditions, and are established the noise main characteristic
for MOS Hall plates. By using the numerical simulation the values of the signal-to-noise ratio and the noise-equivalent magnetic induction for
different structure devices are compared and it is also emphasized the way in which choosing the geometry and the mat[...]
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The selection of genetic algorithm parameters for soft fault diagnosis
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Marek KORZYBSKI Marek OSSOWSKI
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Some methods for soft fault diagnosis developed in last years use evolutionary computing. Genetic algorithms are the most popular
evolutionary method. The genetic algorithms are very sensitive to parameter settings, hence the selection of these parameters seems to be a very
important problem. This paper deals with the issue of an optimal determination of genetic algorithm parameters for soft fau[...]
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Using Stochastic Petri Nets for power system dependability computation
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Mariana DUMITRESCU
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Combining the Generalized Stochastic Petri nets (GSPN) properties and high level Petri nets facilities, a structural simplified model
Logical Explicit Stochastic Petri Nets (LESPN), having the same modeling power as GSPN, is built. LESPN primitive architectural modules are used
in repairable power systems dependability modeling. The paper presents a dependability comparative analysis, used in el[...]
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