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  • 2005-2009  (3)
  • Comparative Studies. Non-European Languages/Literatures  (3)
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  • 2005-2009  (3)
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  • Comparative Studies. Non-European Languages/Literatures  (3)
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  • 1
    Online Resource
    Online Resource
    The design of a boundary element package for treating acoustic scattering from buried objects
    Acoustical Society of America (ASA) ; 2006
    In:  The Journal of the Acoustical Society of America Vol. 120, No. 5_Supplement ( 2006-11-01), p. 3143-3143
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 120, No. 5_Supplement ( 2006-11-01), p. 3143-3143
    Abstract: The target strength of objects placed in water and partially buried in the sediment are calculated by means of a boundary element solver. For this reason, a boundary element code with suitable pre- and postprocessor is developed. With the help of the preprocessor, the scattering objects within the transition range between fluid and sediment can be modeled. The preprocessor can manage large and complex meshes (more than 100 & lt;th & gt;000 elements) and is able to import NASTRAN and ANSYS mesh-files. It automatically generates closed geometric meshes. These meshes are used as database for the BEM calculations. For reducing computing time, the boundary element solver runs on a high number of personal computers in parallel equipped with Windows- or Linux-operating systems. These calculator hosts will receive their task from the preprocessor using TCP/IP-based interprocess communication. The parallel calculations can be performed as a service in the background and remotely administrated by the postprocessor. The postprocessor polls the results from the calculator hosts, delivers them to the appropriate projects, and provides visualization and analysis of the results. The efficiency of such a parallel processing boundary element package will be demonstrated for the acoustic scattering at simple test objects consisting of a high number of surface elements.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.4787780
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2006
    detail.hit.zdb_id: 1461063-2
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  • 2
    Online Resource
    Online Resource
    Calculation of the acoustic target strength of elastic objects based on BEM-BEM-coupling
    Acoustical Society of America (ASA) ; 2008
    In:  The Journal of the Acoustical Society of America Vol. 123, No. 5_Supplement ( 2008-05-01), p. 3757-3757
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 123, No. 5_Supplement ( 2008-05-01), p. 3757-3757
    Abstract: Based on a BEM-BEM-coupling method, the scattered pressure from elastic objects placed in water and partially buried in the sediment is calculated. For this reason, a special variant of the boundary element method (BEM) is implemented. It contains a pre- and a postprocessor with 3D visualization, in order to define the geometry of the scattering objects in the interface layer between fluid and sediment and the parameters needed for characterizing the fluid and the elastic material. The solver is able to perform numerical calculations in a multiple parallel manner. For the solution of the underlying system of linear equations, we use different kinds of approximate and direct solution techniques. Simple acoustical exterior problems, for example, the sound scattering by elastic solid cylinders and spheres placed in a fluid are treated by the BEM-BEM-coupling method. The results will be compared with analytical solutions or solutions obtained from other numerical methods.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.2935332
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2008
    detail.hit.zdb_id: 1461063-2
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  • 3
    Online Resource
    Online Resource
    Bistatic and monostatic scattering from elastic structures using boundary element methods in free space and near plane boundaries.
    Acoustical Society of America (ASA) ; 2009
    In:  The Journal of the Acoustical Society of America Vol. 125, No. 4_Supplement ( 2009-04-01), p. 2733-2733
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 125, No. 4_Supplement ( 2009-04-01), p. 2733-2733
    Abstract: The bistatic and monostatic numerical calculation of the pressure scattered from structures composed of elastic materials and possibly filled with another material is one of the main purposes for the detection of underwater objects. For this reason, the sound pressure scattered from spherical objects placed in and filled with fluid will be calculated in the frequency domain. The results of an in-house developed BEM-package which supports single and multiple fluid-structure-interactions will be compared with analytical solutions based on spherical wave functions and with results of commercial BEM/FEM applications. Performance optimizations of the calculation process for the uncoupled rigid and coupled monostatic case as a result of using a parallelized matrix creation and solution with a specific variant of the direct solving process will be presented. We will also compare results for a cubic structure, placed in water above a finite plane boundary, with an equivalent half-space solution that incorporates a suitable half-space Green’s function and could be used for fast approximations in the mid- and high-frequency range.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.4784515
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2009
    detail.hit.zdb_id: 1461063-2
    Location Call Number Limitation Availability
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    Online Resource
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