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    Wyświetlanie 1-11 z 11
    Tytuł:
    Analytical solution for certain nonlinear electromagnetic field problems
    Autorzy:
    Sowa, M.
    Spałek, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/377744.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    electromagnetic field
    analytical solution
    nonlinear analysis
    Opis:
    The paper presents a nonlinear electromagnetic field problem with cylindrical symmetry. A time-sinusoidal boundary condition is applied, which yields non-sinusoidal steady-state fields. The problem is brought forth to test an analytical-numerical method based on the method of small parameter. A distinctive feature of this method is that it requires symbolic calculations to be performed. These allow to reduce the problem to a system of nonlinear equations. In order to check the accuracy of the solution, several error criteria are introduced. Moreover, the power balance of a nonlinear conductive region is verified.
    Źródło:
    Poznan University of Technology Academic Journals. Electrical Engineering; 2012, 69; 49-56
    1897-0737
    Pojawia się w:
    Poznan University of Technology Academic Journals. Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pole magnetyczne szynoprzewodów prostokątnych o skończonej długości
    Magnetic field in rectangular bus-bars of finite lenght
    Autorzy:
    Szczegielniak, T.
    Piątek, Z.
    Kusiak, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/408310.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
    Tematy:
    szynoprzewód prostokątny
    tor wielkoprądowy
    pole magnetyczne
    metoda analityczna
    rectangular busbar
    high-current busduct
    magnetic field
    analytical method
    Opis:
    W artykule przedstawiono nową analityczną metodę obliczania pola magnetycznego układów szyn prostokątnych. Metoda wykorzystuje prawa Biota-Savarta. Zaproponowana metoda pozwala na wyznaczanie rozkładu pola magnetycznego w układach równoległych szynoprzewodów prostokątnych o dowolnych wymiarach w tym szynoprzewodów o skończonej długości. W szczególności wyznaczono pola magnetyczne w nieekranowanych trójfazowych torach wielkoprądowych z prostokątnymi szynoprzewodami fazowymi i z szynoprzewodem neutralnym.
    This paper presents a new analytical computation method for determining the magnetic field distributions in high-current busducts of rectangular busbars. This method is based on Biot-Savart law. The proposed method allows us to calculate the magnetic field intensity distribution in a set of parallel rectangular busbars of any dimensions including any length. In particular, the magnetic fields in busbars of unshielded three-phase systems with rectangular phase and neutral busbars, and the use of the method are described.
    Źródło:
    Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2013, 4; 45-48
    2083-0157
    2391-6761
    Pojawia się w:
    Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Power losses in the screens of the flat single-pole high-current busduct
    Autorzy:
    Szczegielniak, T.
    Piątek, Z.
    Kusiak, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/97698.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    analytical method
    high-current busduct
    electromagnetic field
    power losses
    Opis:
    This paper presents an analytical method for determining the power losses in the screens of the three-phase gas-insulated transmission line (i.e., high-current busduct) of circular crosssection geometry. The mathematical model takes into account the skin effect and the proximity effects, as well as the complete electromagnetic coupling between phase conductors and enclosures (i.e., screens). The power losses produced by high-current busducts are usually calculated numerically with the use of a computer. However, the analytical calculation of the power losses is preferable, because it results in a mathematical expression for showing its dependences on various parameters of the line arrangement. Moreover, knowledge of the relations between electrodynamics and constructional parameters is necessary in the optimization construction process of the high-current busducts.
    Źródło:
    Computer Applications in Electrical Engineering; 2013, 11; 64-72
    1508-4248
    Pojawia się w:
    Computer Applications in Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    MHD flow of Walters’ liquid B over a nonlinearly stretching sheet
    Autorzy:
    Siddheshwar, P. G.
    Mahabaleshwar, U. S.
    Chan, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/265047.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    analytical solution
    magnetic field
    nonlinear stretching sheet
    Walters' liquid B
    pole magnetyczne
    blacha
    rozciąganie blachy
    Opis:
    The paper discusses the boundary layer flow of a weak electrically conducting viscoelastic Walters’ liquid B over a nonlinearly stretching sheet subjected to an applied transverse magnetic field, when the liquid far awal from the surface is at rest. The stretching is assumed to be a quadratic function of the coordinate along the direction of stretching. An analytical expression is obtained for the stream function and velocity components as a function of the viscoelastic parameter, the Chandrasekhar number and stretching related parameters. The results have possible technological applications in liquid based systems involving stretchable materials.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2015, 20, 3; 589-603
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of heating curves of a rectangular busbar in different conditions of heat abstraction during the short-circuit heating
    Autorzy:
    Zaręba, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/201224.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    analytical methods
    field theory
    transient heat flow
    short-circuit in leads
    Green’s function
    metody analityczne
    teoria pola
    nieustalony przepływ ciepła
    funkcja Greena
    Opis:
    The paper compares heating curves for a rectangular busbar in the conditions of convective and adiabatic heat transfer during short-circuit heating. Different coefficients of heat transfer from the external surface of the busbar and different busbar cross-sections have been assumed. This has allowed determining the error value occurring when the adiabatic rather than convective boundary condition is presumed at short circuit. The analysis takes into account a change of resistivity in the temperature function. The respective boundary-initial problems have been solved with analytical methods using Green’s function. The calculated results show that no considerable errors occur for long-lasting short circuits with an adiabatic rather than convective boundary condition.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2018, 66, 1; 79-85
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Field Theoretical Model of the Polish Emigration to Other European Countries
    Autorzy:
    Mueller, Georg P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1790682.pdf
    Data publikacji:
    2019-08-22
    Wydawca:
    Polskie Towarzystwo Socjologiczne
    Tematy:
    Polska
    International Migration
    social field theory
    analytical sociology
    international comparisons
    Opis:
    This article presents a formalized field theory of international migration. Departing from the theories of Kurt Lewin, the author assumes that the valences of different migration targets create a field of attracting forces, which may trigger long-range “locomotions.” Moreover, the author hypothesizes that the selection among the different migration targets also depends on the perceived opportunities: the higher the number of vacancies at a target and the stronger the reporting about these vacancies by earlier migrants, the stronger the field of perceived opportunities. A mathematical model based on these theoretical assumptions is tested with data about migration from Poland to other EU countries. The goodness of fit of the model is quite high and seems to corroborate its field theoretical foundations. The model is further explored by simulating its behavior for different scenarios of valences and perceived opportunities. The article finishes with a summary from the perspective of analytical sociology.
    Źródło:
    Polish Sociological Review; 2019, 207, 3; 323-336
    1231-1413
    2657-4276
    Pojawia się w:
    Polish Sociological Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the influence of current frequency on the thermal field of the insulated busbar
    Autorzy:
    Gołębiowski, J.
    Zaręba, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/200976.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    frequency analysis
    analytical methods
    temperature field
    insulated busbar
    Opis:
    The paper analysed the influence of current frequency on the thermal field of the insulated busbar. Its physical model consists of two hollow cylinders and a solid cylinder with different material properties. In turn, the mathematical model is a system of heat conduction equations with the appropriate set of the boundary, initial and continuity conditions. The problem was solved using the modified Green’s method. As a result, the following characteristics and parameters of the busbar were determined as a functions of frequency: heating curves, local time constants, steady-state current ratings, and stationary temperature profiles. The results were positively verified by finite element method.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 1; 89-97
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An analytical-numerical method for calculating the stationary thermal field in electrical systems with elliptical cross-sections
    Autorzy:
    Gołębiowski, Jerzy
    Zaręba, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/2128141.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    analytical-numerical methods of field theory
    elliptical conductors
    Poisson's equation
    metody teorii pola analityczno-numeryczne
    przewodniki eliptyczne
    równanie Poissona
    Opis:
    In this article, an analytical-numerical approach to calculating a stationary thermal field in the elliptical region is presented. The eigenfunctions of the Laplace operator were determined analytically, whereas the coefficients of the eigenfunctions were obtained numerically. The cooling was modeled with 3rd kind (Hankel’s) boundary condition, where the total heat transfer coefficient was the sum of the convective and radiative components. The method was used to analyze the thermal field in an elliptical conductor and a dielectrically heated elliptical column. The basic parameters of these systems, i.e. their steady-state current rating and the maximum charge temperature, were determined. The results were verified using the finite element method and have been presented graphically.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 2; e136738, 1--6
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An analytical-numerical method for calculating the stationary thermal field in electrical systems with elliptical cross-sections
    Autorzy:
    Gołębiowski, Jerzy
    Zaręba, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/2173609.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    analytical-numerical methods of field theory
    elliptical conductors
    Poisson's equation
    metody teorii pola analityczno-numeryczne
    przewodniki eliptyczne
    równanie Poissona
    Opis:
    In this article, an analytical-numerical approach to calculating a stationary thermal field in the elliptical region is presented. The eigenfunctions of the Laplace operator were determined analytically, whereas the coefficients of the eigenfunctions were obtained numerically. The cooling was modeled with 3rd kind (Hankel’s) boundary condition, where the total heat transfer coefficient was the sum of the convective and radiative components. The method was used to analyze the thermal field in an elliptical conductor and a dielectrically heated elliptical column. The basic parameters of these systems, i.e. their steady-state current rating and the maximum charge temperature, were determined. The results were verified using the finite element method and have been presented graphically.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 2; art. no. e136738
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Integrated analytical-field design method of multi-disc magnetorheological clutches for automotive applications
    Autorzy:
    Kluszczyński, Krzysztof
    Pilch, Zbigniew
    Powiązania:
    https://bibliotekanauki.pl/articles/2086881.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    electromechanical convertor
    drive system component
    electromagnetic calculations
    MR fluids
    magnetorheological fluids
    MR multi-disc clutch
    multi-disc magnetorheological clutch
    clutch design
    analytical field
    design
    przetwornik elektromechaniczny
    element układu napędowego
    obliczenia elektromagnetyczne
    płyny MR
    płyny magnetoreologiczne
    wielotarczowe sprzęło magnetoreologiczne
    sprzęgło wielotarczowe
    projektowanie
    Opis:
    This study proposes a new integrated analytical-field design method for multi-disc magnetorheological (MR) clutches. This method includes two stages, an analytical stage (composed of 36 algebraic formulas) and a field stage based on the finite element method (FEM). The design procedure is presented systematically, step-by-step, and the results of the consecutive steps of the design calculations are depicted graphically against the background of the entire considered clutch. The essential advantage of the integrated method with this two-stage structure is the relatively high accuracy of the first analytical stage of the design procedure and the rapid convergence of the second field stage employing the FEM. The essence of the new method is the introduction of a yoke factor ky (the concept of which is based on the theory of induction machines) that determines the ratio of magnetomotive force required to magnetise the entire magnetic circuit of the clutch to the magnetomotive force required to magnetise the movement region. The final value, the yoke factor ky is determined using loop calculations. The simplicity of the developed design method predisposes its use in optimisation calculations. The proposed method can also be adapted to other MR devices analysed in shear mode.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 6; e139392, 1--15
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characteristics simulations of the electrodynamic railgun different constructions and their measurement verification
    Autorzy:
    Piekielny, Paweł
    Tomczuk, Bronisław
    Waindok, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/27309948.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    3D field analysis
    analysis of transients
    analytical models
    electrodynamic accelerator
    experimental verification
    field-circuit modeling
    projectile velocity
    Opis:
    Dynamic characteristics for three types of railgun constructions were simulated and measured in this work. The simplest construction is the iron-less (IL) railgun, while the two other ones (IC and ICPM) have an iron-core. The iron-core permanent magnet (ICPM) railgun additionally has permanent magnets. To compare their characteristics, similar dimensions of the rails and iron cores were adopted, and the same power supply system was used. Numerical magnetic field analyses and our analytical models have been used to determine the electromagnetic parameters. They were verified experimentally. The transient states of the railguns were studied with our field-circuit mathematical model, and their results were also verified by experiments.
    Źródło:
    Archives of Electrical Engineering; 2023, 72, 4; 951--969
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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