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Wyszukujesz frazę "topology" wg kryterium: Temat

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    Wyświetlanie 1-10 z 10
    Tytuł:
    Optimization of space-time material layout for ID wave propagation with varying mass and stiffness parameters
    Autorzy:
    Jensen, J. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/969896.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    dynamic structures
    topology optimization
    wave propagation
    transient analysis
    Opis:
    Results are presented for optimal layout of materials in the spatial and temporal domains for a ID structure subjected to transient wave propagation. A general optimization procedure is outlined including derivation of design sensitivities for the case when the mass density and stiffness vary in time. The outlined optimization procedure is exemplified on a ID wave propagation problem in which a single gaussian pulse is compressed when propagating through the optimized structure. Special emphasis is put on the use of a time-discontinuous Galerkin integration scheme that facilitates analysis of a system with a time-varying mass matrix.
    Źródło:
    Control and Cybernetics; 2010, 39, 3; 599-614
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fuzzy regions: interpretations of surface area and distance
    Autorzy:
    Verstraete, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/970936.pdf
    Data publikacji:
    2009
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    fuzzy topology
    fuzzy EIS
    fuzzy surface
    fuzzy distance
    Opis:
    This contribution concerns the modelling of fuzzy information in geographic databases. For this purpose, fuzzy regions and fuzzy points have been defined in the past, along with a number of suitable operations. For numerical information - such as the surface area of fuzzy regions, or the distance between fuzzy regions and/or fuzzy points - the computation depends on the interpretation given to the fuzzy regions or points. Consequently, it is important to differentiate between the interpretation in order to obtain correct results. This article explains in detail the impact of the interpretation in terms of both the surface area and the distance.
    Źródło:
    Control and Cybernetics; 2009, 38, 2; 509-526
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Topological sensitivity analysis for elliptic problems on graphs
    Autorzy:
    Leugering, G.
    Sokolowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/970307.pdf
    Data publikacji:
    2008
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    differential equations on metric graphs
    obstacles
    topology optimization
    asymptotic analysis
    Opis:
    We consider elliptic problems on graphs under given loads and bilateral contact conditions. We ask the question: which graph is best suited to sustain the loads and the constraints. More precisely, given a cost function we may look at a multiple node of the graph with edge degree q and ask as to whether that node should be resolved into a number of nodes of edge degree less than q, in order to decrease the cost. With this question in mind, we are looking into the sensitivity analysis of a graph carrying a second order elliptic equation with respect to changing its topology by releasing nodes with high edge degree or including an edge. With the machinery at hand developed here, we are in the position to define the topological gradient of an elliptic problem on a graph.
    Źródło:
    Control and Cybernetics; 2008, 37, 4; 971-997
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Topology optimization - broadening the areas of application
    Autorzy:
    Bendsoe, M. P.
    Lund, E.
    Olhoff, N.
    Sigmund, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/970157.pdf
    Data publikacji:
    2005
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    optymalizacja topologiczna
    laminat
    płyn
    topology optimization
    laminates
    pressure loads
    multiphysics
    fluids
    Opis:
    This paper deals with recent, developments of topology optimization techniques for application in some new types of design problems. The emphasis is on recent work of the Danish research groups at Aalborg University and at the Technical University of Denmark and focus is on the central role that the choice of objective functions and design parameterization plays for a successful extension of the material distribution approach to new design settings and to new types of physics models. The applications that will be outlined encompass design of laminated composite structures, design for pressure loads, design in fluids, design in acoustics, and design in photonics. A short outline of other design optimization activities is also given.
    Źródło:
    Control and Cybernetics; 2005, 34, 1; 7-35
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Shape sensitivity analysis of eigenvalues revisited
    Autorzy:
    Nazarov, S. A.
    Sokolowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/970311.pdf
    Data publikacji:
    2008
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    spectral problem
    singular perturbation
    eigenvalues of Laplacian
    shape sensitivity analysis
    topology optimization
    Opis:
    The paper can be considered as a complement to previous papers of the authors. An insight into applied asymptotic analysis of boundary value problems in singularly perturbed domains is presented. As a result, the asymptotic expansions of eigenvalues are obtained and discussed in terms of integral attributes of the geometrical perturbations including the virtual mass tensor, polarization tensor etc. The results are presented in such a way that can be easily employed in numerical methods for shape optimization and inverse problems.
    Źródło:
    Control and Cybernetics; 2008, 37, 4; 999-1012
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A new approach for simultaneous shape and topology optimization based on dynamic implicit surface function
    Autorzy:
    Guo, H.
    Zhao, K.
    Wang, M. Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/970141.pdf
    Data publikacji:
    2005
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    optymalizacja topologiczna
    pochodna topologiczna
    topology optimization
    implicit
    surface function
    topological derivative
    level set
    Opis:
    In the present paper, a new approach for structural topology optimization based on dynamic implicit surface function (DISF) is proposed. DISF is used to describe the shape/topology of a structure, which is approximated in terms of the nodal values. Then, a relationship is established between the element stiffness and the values of the implicit surface function on its four nodes. In this way and with some non-local treatments of the design sensitivities, not only the shape derivative but also the topological derivative of the optimal design can be incorporated in the numerical algorithm in a unified way. Numerical experiments demonstrate that by employing this approach, the computational efforts associated with DISF (and level set) based algorithms can be diminished. Clear optimal topologies and smooth structural boundaries free from any sign of numerical instability can be obtained simultaneously and efficiently.
    Źródło:
    Control and Cybernetics; 2005, 34, 1; 255-282
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural optimization using topological and shape sensitivity via a level set method
    Autorzy:
    Allaire, G.
    Gournay, F. de
    Jouve, F.
    Toader, A.-M.
    Powiązania:
    https://bibliotekanauki.pl/articles/970155.pdf
    Data publikacji:
    2005
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    optymalizacja kształtu i topologiczna
    gradient topologiczny
    shape and topology optimization
    level set method
    topological gradient
    Opis:
    A numerical coupling of two recent methods in shape and topology optimization of structures is proposed. On the one hand, the level set method, based on the classical shape derivative, is known to easily handle boundary propagation with topological changes. However, in practice it does not allow for the nucleation of new holes (at least in 2-d). On the other hand, the bubble or topological gradient method is precisely designed for introducing new holes in the optimization process. Therefore, the coupling of these two method yields an efficient, algorithm which can escape from local minima in a given topological class of shapes. Both methods rely on the notion of gradient computed through an adjoint analysis, and have a low CPU cost since they capture a shape on a fixed Eulerian mesh. The main advantage of our coupled algorithm is to make the resulting optimal design largely independent of the initial guess.
    Źródło:
    Control and Cybernetics; 2005, 34, 1; 59-80
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the evaluation of compatibility with gradual rules in information systems : a topological approach
    Autorzy:
    Kortelainen, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/205981.pdf
    Data publikacji:
    1999
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    analiza danych
    topologia
    zbiór rozmyty
    data analysis
    knowledge acquisition
    L-fuzzy sets
    modifier logic
    rough sets
    topology
    Opis:
    The paper presents an approach to detecting dependence of a decision-maker's actions (or decisions) on conditions with respect to a certain type of fuzzy rules, namely gradual rules. Gradual rules are of the form "the more c is C, the more d is D", where C and D are L-fuzzy sets on the domain of the attributes c and d with membership values possibly in different lattices, respectively. The decision-maker's actions and conditions for those are found in a data base-like system, called an information system. We use the information system to define relations corresponding to L-fuzzy sets, and we define weakening modifiers by these relations. These modifiers are closure operators in the corresponding topologies, and we can define fineness relation between L-fuzzy sets. This relation is useful when comparing different decision-maker's actions. We define strong degree and topological degree of depedence of the attributes (with respect to a gradual rule), and we study some properties of those. Finally, we present a small application.
    Źródło:
    Control and Cybernetics; 1999, 28, 1; 121-131
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mathematical challenges in shape optimization
    Autorzy:
    Henrot, A.
    Sokołowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/970146.pdf
    Data publikacji:
    2005
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    optymalizacja kształtu
    optymalizacja topologiczna
    zagadnienie znajdowania wartości własnych
    równanie Naviera-Stokesa
    Navier-Stokes equations
    shape optimization
    topology optimization
    eingenvalue problem
    Opis:
    Activities of the CNRS programme GDR shape optimization are described. Recent developments in shape optimization for eigenvalues and drag minimization are presented.
    Źródło:
    Control and Cybernetics; 2005, 34, 1; 37-57
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fast level set based algorithms using shape and topological sensitivity information
    Autorzy:
    Hintermuller, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/970129.pdf
    Data publikacji:
    2005
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    algorytm opadania
    metoda Newtona
    analiza wrażliwości
    optymalizacja kształtu
    optymalizacja topologiczna
    descent algorithm
    level set method
    Newton method
    sensitivity analysis
    shape optimization
    topology optimization
    Opis:
    A framework for descent algorithms using shape as well as topological sensitivity information is introduced. The concept of gradient-related descent velocities in shape optimization is defined, a corresponding algorithmic approach is developed, and a convergence analysis is provided. It is shown that for a particular choice of the bilinear form involved in the definition of gradient-related directions a shape Newton method can be obtain. The level set methodology is used for representing and updating the geometry during the iterations. In order to include topological changes in addition to merging and splitting of existing geometries, a descent algorithm based on topological sensitivity is proposed. The overall method utilizes the shape sensitivity and topological sensitivity based methods in a serial fashion. Finally, numerical results are presented.
    Źródło:
    Control and Cybernetics; 2005, 34, 1; 305-324
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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