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Wyszukujesz frazę "electromagnetic method" wg kryterium: Temat


Wyświetlanie 1-11 z 11
Tytuł:
Pilot implementation of the on-line partial discharge monitoring system for heads of the high voltage cable lines
Autorzy:
Konarski, Michał
Węgierek, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/220896.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
cable lines diagnostics
partial discharges
unconventional methods of partial discharges measurement
UHF electromagnetic method
Opis:
The article presents the assumptions, characteristics and description of the implementation of a pilot system for on-line monitoring of partial discharges in heads of the high-voltage cable lines. The main purpose of the implementation was to increase the reliability of cable line heads by equipping them with a system of continuous assessment of technical condition with direct transmission of measurement data and alarms to the SCADA system. In order to achieve the assumed goal, unconventional methods for measuring partial discharges were used, the application of which does not require disconnecting the line from the voltage. The implementation was carried out on an active 110 kV high voltage cable line in the area of activity of one of the Distribution System Operators.
Źródło:
Metrology and Measurement Systems; 2020, 27, 2; 373-382
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling of linear dispersive materials using scalable time domain finite element scheme
Autorzy:
Butryło, B.
Powiązania:
https://bibliotekanauki.pl/articles/140567.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
dispersive dielectrics
electromagnetic field
finite element method
fractional relaxation
wideband numerical scheme
Opis:
This paper deals with some aspects of formulation and implementation of a broadband algorithm with build-in analysis of some dispersive media. The construction of the finite element method (FEM) based on direct integration of Maxwell’s equations and solution of some additional convolution integrals is presented. The broadband, fractional model of permittivity is approximated by a set of some relaxation sub-models. The properties of the 3D time-dependent formulation of the FEM algorithm are determined using a benchmark problem with the Cole-Cole and the Davidson-Cole models. Several issues associated with the implementation and some constraints of the broadband finite element algorithm are presented.
Źródło:
Archives of Electrical Engineering; 2016, 65, 4; 719-732
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design and analysis of the ferrite air-gapped cores for a resonant inductor
Autorzy:
Zheng, J.
Wang, Ch.
Xia, D.
Powiązania:
https://bibliotekanauki.pl/articles/949922.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
three-air-gapped
electromagnetic and thermal field
finite element method
resonant inductor
Opis:
In this paper, a three-air-gapped structure of a ferrite core for a resonant inductor is proposed. The electromagnetic and thermal field models are built using a 3D finite element method. Compared with the conventional signal-air-gapped structure of a ferrite core, the simulation and analysis results show that the proposed three-air-gapped ferrite core resonant inductor can reduce eddy-current loss and decrease temperature rise. In addition, the optimal position of air-gapped is presented.
Źródło:
Archives of Electrical Engineering; 2018, 67, 3; 579--589
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of the rotor eccentricity on the torque of a cage induction machine
Autorzy:
Silwal, B.
Rasilo, P.
Belahcen, A.
Arkkio, A.
Powiązania:
https://bibliotekanauki.pl/articles/141083.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
cage induction machine
dynamic eccentricity
electromagnetic torque
energy balance
finite element method
harmonics
Opis:
The non-uniform air gap in an electrical machine caused by rotor eccentricity creates an asymmetrical flux-density distribution in the air gap. This can affect the nominal torque produced by the machine. Eccentricity also produces forces that act on the rotor which may also have an effect on the torque. Thus, it is important to know how the torque of the machine behaves. In this paper, the torque of a cage induction machine is studied when the machine has dynamic eccentricity. The study is performed using the finite element method and a magnetic vector potential formulation. The torque is calculated by the method of energy balance. The harmonic components of the torque are also analyzed. The results show that the machine under eccentricity does not exhibit the same torque as a normal healthy machine. The harmonic components around the first principal slot harmonic is most affected.
Źródło:
Archives of Electrical Engineering; 2017, 66, 2; 383-396
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the influence of the complex structure of clay hollow bricks on the values of electric field intensity by using the FDTD method
Autorzy:
Choroszucho, A.
Powiązania:
https://bibliotekanauki.pl/articles/140952.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
building materials
electromagnetic waves propagation
finite-difference time-domain method (FDTD)
wireless communication systems
Opis:
The study presents the analysis of the effects occurring at the propagation of electromagnetic waves within an area containing non-ideal, non-homogenous and absorbing dielectric. The analysed models are connected with housing constructions and include single and double-layered walls made of clay hollow bricks. The influence of the size of holes, the contained clay mass percentage and conductivity of brick on the distribution of electric field is presented. Double-layered wall causes more heterogeneity in distribution of electric field and numerous maxima and minima to compare with singlelayered construction. The presented results refer to the electromagnetic field generated by a wireless communication system (Wi-Fi), operating within the standard frequencies (2.4 GHz and 5 GHz). A FDTD method was used to the analysis of electric field distribution. Also in this paper all formulations of difference method (FDTD) is presented. The possibilities of modifying the described method are indicated too. The obtained values of electric field intensity allow to determining the attenuation coefficient for different variants of the walls. Detailed analysis of influence of different types of building construction will make it possible to better understand the wave phenomena and counteract local fading at planning of wireless networks systems.
Źródło:
Archives of Electrical Engineering; 2016, 65, 4; 745-759
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modal-frequency spectrum of magnetic flux density in air gap of permanent magnet motor
Autorzy:
Witczak, P.
Kubiak, W.
Lefik, M.
Szulakowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/140681.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
electromagnetic fields
waves permanent magnet machines
air gap magnetic flux
spectral analysis
finite element method
Opis:
The classic relationships concerning the harmonic content in the air gap field of three-phase machines are presented in form of series of rotating waves. The same approach is applied to modeling of permanent magnet motors with fractional phase windings. All main reasons of non-sinusoidal shape of flux density distribution, namely, magnets’ shape and their placement, slotting, magnetic saturation and eccentricity are also related to their counterparts in modal-frequency spectrum. The Fourier 2D spectrum of time-stepping finite element solution is confronted with results of measurements, with special attention paid to accuracy of both methods.
Źródło:
Archives of Electrical Engineering; 2014, 63, 1; 29-46
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling Liquid Steel Motion Caused by Electromagnetic Stirring in Continuous Casting Steel Process
Modelowanie ruchów ciekłej stali wywołane mieszaniem elektromagnetycznym w procesie ciągłego odlewania
Autorzy:
Rywotycki, M.
Malinowski, Z.
Giełżecki, J.
Gołdasz, A.
Powiązania:
https://bibliotekanauki.pl/articles/355391.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
continuous casting
electromagnetic stirring
numerical modelling
finite elements method
odlewanie ciągłe
mieszanie elektromagnetyczne
modelowanie numeryczne
metoda elementów skończonych
Opis:
The paper presents an attempt of modelling liquid steel motion triggered off by electromagnetic stirring. Steel viscosity was calculated on the basis of temperature field determined with the use of stationary heat conduction equation. Velocity field was determined using Navier-Stokes equations and stream continuity equation. Solution was obtained using the finite element method. The developed model allows to carry out quick simulating calculations of fluid flow. Stationary solution was employed, and this allowed to reduce computation time substantially.
W pracy podjęto próbę modelowania ruchu ciekłej stali wywołanej mieszaniem elektromagnetycznym. Lepkość stali obliczano na podstawie pola temperatury wyznaczonego ze stacjonarnego równania przewodzenia ciepła. Pole prędkości wyznaczono korzystając z równań Naviera-Stokesa i równania ciągłości strugi. Rozwiązanie uzyskano metodą elementów skończonych. Opracowany model pozwala na wykonywanie szybkich obliczeń symulacyjnych ruchów ciekłej stali. Zastosowano rozwiązanie stacjonarne, co umożliwiło istotne skrócenie czasu obliczeń.
Źródło:
Archives of Metallurgy and Materials; 2014, 59, 2; 487-492
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the electromagnetic response of complex dispersive material with the single-step wideband finite element method
Autorzy:
Butryło, B.
Powiązania:
https://bibliotekanauki.pl/articles/141234.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
propagation of electromagnetic pulse
dielectric dispersion
frequency selective materials
broadband time-domain simulation
finite element time-domain method
Opis:
The paper describes the formulation and implementation of the broadband finite element time domain algorithm. The presented formalism is valid to analysis of electromagnetic phenomena in linear, frequency selective materials. The complex profile of permittivity of materials is approximated using a set of the Lorentz resonance models. The solution of the integro-differential second order equation is obtained using a singlestep integration scheme and a recursive convolution algorithm. The discussed formulation enables to adopt the structure of the narrowband part as well as the phase of calculation of the convolution equations for the subsequent components. The properties of the algorithm are validated using a finite difference broadband algorithm.
Źródło:
Archives of Electrical Engineering; 2013, 62, 1; 111-122
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Coupling electromagnetic (FE) models to multidomain simulator to analyse eletrical drives and complex control systems
Autorzy:
Jagieła, M.
Garbiec, T.
Powiązania:
https://bibliotekanauki.pl/articles/141422.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
symulacja wspólna
napęd elektryczny
modelowanie matematyczne
metoda elementów skończonych
co-simulation
electrical drives
electromagnetic systems
mathematical modelling
finite element method
Opis:
This work presents the co-simulation approach to the analysis of control systems containing detailed models of electromagnetic and electromechanical converters. In this method of analysis the attention is paid to the whole system and not only to its electromagnetic part. The latter is described by equations resulted from the two-dimensional finite element discretisation of the Maxwell equations, and is coupled weakly with the remaining part of the system. The simulation is carried out in Matlab/Simulink environment wherein the coupling is realised through the S-function. Example results regarding simulation of the operation of the control system of an electrical machine and the operation of a power electronic converter are presented and compared with available reference data.
Źródło:
Archives of Electrical Engineering; 2010, 59, 3-4; 189-201
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Photoacoustic transformation at oppositely directed interaction electromagnetic waves in the magnetoactive two-layer medium
Transformacja fotoakustyczna przy oddziaływaniu przeciwbieżnych wiązek elektromagnetycznych w magnetoaktywnych ośrodkach dwuwarstwowych
Autorzy:
Mityurich, G. S.
Aleksiejuk, M.
Sviridova, V. V.
Serdyukov, A. N.
Powiązania:
https://bibliotekanauki.pl/articles/351166.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
photoacoustic signal gas-microphone method
thermooptical sound generation
magnetic circular dichroism
tunnel interference of electromagnetic waves
metoda foto-akustyczna generacji dźwięku
magnetoaktywne układy dwuwarstwowe
termooptyczna genaracja dźwięku
tunelowa interferencja fal elektromagnetycznych
Opis:
The paper treats the thermooptical sound generation in the magnetoactive two-layered medium on the condition of tunnel interference of electromagnetic waves. It were studied the conditions of complete suppression of the photoacoustic signal amplitude in response to the polarization type of oppositely interacting waves, the difference in their initial phases as well as the intensities of one of the oppositely interacted beams. The given paper provides an effective method of managing the thermooptical sound generation in the magnetoactive structural element during the tunnel electromagnetic interference of electromagnetic waves.
Celem pracy są badania nad foto-akustyczną generacją dźwięku w magnetoaktywnych układach dwuwarstwowych, w warunkach interferencji tunelowej fal elektromagnetycznych. Badano warunki całkowitego wytłumienia amplitudy sygnału fotoakustycznego w funkcji polaryzacji przeciwbieżnych, oddziałujących wzajemnie fal, ich faz początkowych oraz intensywności jednej z przeciwbieżnych wiązek. Praca przedstawia efektywną metodę sterowania termooptyczną generacją dźwięku w strukturach magnetoaktywnych, podczas tunelowej interferencji fal elektromagnetycznych.
Źródło:
Archives of Metallurgy and Materials; 2013, 58, 4; 1419-1423
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Two-level approach for solving the inverse problem of defects identification in Eddy Current Testing - type NDT
Autorzy:
Putek, P.
Crevecoeur, G.
Slodička, M.
Gawrylczyk, K.M.
Van Keer, R.
Dupré, L.
Powiązania:
https://bibliotekanauki.pl/articles/140340.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
charakterystyka wad
elektromagnetyczny problem odwrotny
problem odwrotny
algorytmy optymalizacji
algorytmy dwupoziomowe
badanie wiroprądowe
analiza wrażliwości
defect characterization
electromagnetic inverse problem
two level optimization algorithms
eddy current testing method
sensitivity analysis
Opis:
This work deals with the inverse problem associated to 3D crack identification inside a conductive material using eddy current measurements. In order to accelerate the time-consuming direct optimization, the reconstruction is provided by the minimization of a last-square functional of the data-model misfit using space mapping (SM) methodology. This technique enables to shift the optimization burden from a time consuming and accurate model to the less precise but faster coarse surrogate model. In this work, the finite element method (FEM) is used as a fine model while the model based on the volume integral method (VIM) serves as a coarse model. The application of the proposed method to the shape reconstruction allows to shorten the evaluation time that is required to provide the proper parameter estimation of surface defects.
Źródło:
Archives of Electrical Engineering; 2011, 60, 4; 497-518
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
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