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    Wyświetlanie 1-3 z 3
    Tytuł:
    Stability analysis of MRASSCC speed estimator in motoring and regenerating mode
    Autorzy:
    Korzonek, M.
    Orłowska-Kowalska, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1193274.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    induction motor
    vector control
    MRAS-type estimator
    stability
    regenerating mode
    stabilization method
    Opis:
    This paper deals with the stability analysis of MRAS current speed estimator in a motoring and regenerating mode. The unstable operating points of the estimator, mainly in a regenerating mode are widely discussed. The expanded version of the estimator MRASCC is proposed to provide its stability in the whole operating range. The new correction coefficients for two analyzed stabilization methods are proposed. Finally, simulation results confirming the theoretical analysis are presented.
    Źródło:
    Power Electronics and Drives; 2016, 1, 36/2; 113-131
    2451-0262
    2543-4292
    Pojawia się w:
    Power Electronics and Drives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Extended penalty coefficients for elimination the locking effects in moderately thick beam and plate finite elements
    Autorzy:
    Gilewski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/230116.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    metoda elementów skończonych
    blokada ścinania
    stabilizacja
    spójność
    finite elements method
    shear locking
    stabilization
    consistency
    Opis:
    The present paper is dedicated to presentation and energy verification of the methods of stabilization the strain energy by penalty coefficients. Verification of the methods is based on the consistency and ellipticity conditions to be satisfied by the finite elements. Three methods of stabilization are discussed. The first does not satisfy the above requirements. The second is consistent but cannot eliminate parasitic energy terms. The third method, proposed by the author, is based on the decomposition of the element stiffness matrix. The method can help to eliminate locking of the finite elements. For two-noded beam element with linear shape functions and exact integration a stabilized free of locking (and elliptical) element is received (equivalent to reduced integration element). Two plate finite elements are analyzed: four-noded rectangular element and DSG triangle. A new method of stabilization with the use of four independent parameters is proposed. The finite elements with this kind of stabilization satisfy the consistency condition. In the rectangular element it was not possible to eliminate one parasitic term of energy which appears during the procedure. For DSG triangle all parasitic terms of energy are eliminated. The penalty coefficients depends on the geometry of the triangle.
    Źródło:
    Archives of Civil Engineering; 2014, 60, 3; 367-385
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Efficient simulations of large-scale convective heat transfer problems
    Autorzy:
    Goik, Damian
    Banaś, Krzysztof
    Bielański, Jan
    Chłoń, Kazimierz
    Powiązania:
    https://bibliotekanauki.pl/articles/2097965.pdf
    Data publikacji:
    2021
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    convective heat transfer
    finite element method
    sparse linear equations
    algebraic multigrid
    Navier–Stokes equations
    GMRES
    block preconditioning
    SUPG stabilization
    MPI
    PETSc
    scalability
    Opis:
    We describe an approach for efficient solution of large-scale convective heat transfer problems that are formulated as coupled unsteady heat conduction and incompressible fluid-flow equations. The original problem is discretized over time using classical implicit methods, while stabilized finite elements are used for space discretization. The algorithm employed for the discretization of the fluid-flow problem uses Picard’s iterations to solve the arising nonlinear equations. Both problems (the heat transfer and Navier–Stokes equations) give rise to large sparse systems of linear equations. The systems are solved by using an iterative GMRES solver with suitable preconditioning. For the incompressible flow equations, we employ a special preconditioner that is based on an algebraic multigrid (AMG) technique. This paper presents algorithmic and implementation details of the solution procedure, which is suitably tuned – especially for ill-conditioned systems that arise from discretizations of incompressible Navier–Stokes equations. We describe a parallel implementation of the solver using MPI and elements from the PETSC library. The scalability of the solver is favorably compared with other methods, such as direct solvers and the standard GMRES method with ILU preconditioning.
    Źródło:
    Computer Science; 2021, 22 (4); 517--538
    1508-2806
    2300-7036
    Pojawia się w:
    Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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