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    Wyświetlanie 1-2 z 2
    Tytuł:
    Finite element modelling and static shape control of a functionally graded piezoelectric beam
    Autorzy:
    Eshraghi, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/38697103.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Podstawowych Problemów Techniki PAN
    Tematy:
    functionally graded piezoelectric beam
    finite element method
    shape control
    Buildup Voltage Distribution algorithm
    Opis:
    A finite element model is developed for discretization and analysis of the functionally graded piezoelectric material (FGPM) beam based on the Timoshenko beam theory and assuming linear constitutive relation for the corresponding piezoelectric material behavior. Results obtained using the developed finite element code are compared with the available experimental and numerical results for smart structures with and without graded properties. Static shape control of the beam is conducted using the Buildup Voltage Distribution (BVD) algorithm by implementing this method in the finite element routine. Numerical simulations have been performed to study the performance of the shape control algorithm by optimizing the distribution of the applied voltages. Furthermore, the effect of the number of iterations on the result accuracy as well as the variation of the control voltage distribution with the number of discretized regions and the volume fractions of the constituent material is studied. A fast numerical convergence with good accuracy is observed for the shape control of FGPM beams using the developed method. The proposed technique is a good candidate for the modeling, analysis, and control of smart structures with graded properties.
    Źródło:
    Archives of Mechanics; 2023, 75, 4; 469-492
    0373-2029
    Pojawia się w:
    Archives of Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chosen possibilities of $ \overline{ \epsilon } $-fuzzy boundary elements method application in the analysis of conductivity problems with uncertainties
    Autorzy:
    Witek, Halina
    Witek, Bernard
    Powiązania:
    https://bibliotekanauki.pl/articles/38705714.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Podstawowych Problemów Techniki PAN
    Tematy:
    ɛ-fuzzy boundary element method
    ɛ-number
    fuzzy boundary element method
    heat conduction
    temperature distribution
    object diagnosis
    ɛ-metoda rozmytych elementów brzegowych
    metoda rozmytych elementów brzegowych
    przewodnictwo cieplne
    rozkład temperatury
    diagnoza obiektu
    Opis:
    The paper presents a methodology of solving boundary problems with uncertainty parameters based on the use of interval perturbation numbers. This methodology allows for the analysis of very complex problems with different uncertain parameters. Fuzzy Boundary Element Method (FBEM) using $ \overline{ \epsilon } $-number will be called $ \overline{ \epsilon } $-Fuzzy Boundary Element Method ($ \overline{ \epsilon } $-FBEM). Detailed discussion of the problems of computing and applications will be presented on the example of the fuzzy boundary integral equation arising from the boundary problem for the potential problems with heterogeneous, fuzzy boundary conditions of Dirichlet and Neumann type, fuzzy internal sources, fuzzy boundary and fuzzy fundamental solution. The presented methodology can be used to solve various engineering problems (e.g. in civil engineering, power engineering and others) – e.g. to analyze the temperature distribution in structural elements or elements located in the vicinity of objects or devices. In the latter case the increased temperature may be a symptom of a severe failure (e.g. power transformer overload, overexcitation or a fault) which cannot be tolerated due to the threat to the object and to the entire power system. Proposed method maybe used for electrical equipment diagnosis and in consequence as a power system failure prevention. In this paper calculation methodology is illustrated on the example of an area bounded by a square, on the left boundary of which a certain temperature is set, while on the rest of the boundaries the conditions are equal to zero. A dedicated computer program allows for the calculation of both temperature and temperature derivative for any number of boundary elements using $ \overline{ \epsilon } $-FBEM.
    Źródło:
    Computer Assisted Methods in Engineering and Science; 2023, 30, 4; 407-426
    2299-3649
    Pojawia się w:
    Computer Assisted Methods in Engineering and Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-2 z 2

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