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  • 1
    Electronic Resource
    Electronic Resource
    Dynamic response in the time domain by coupled boundary and finite elements (1990)
    Springer
    Computational mechanics 6 (1990), S. 35-46 
    Details
    ISSN: 1432-0924
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract This paper reports on the development of a finite element — boundary element coupling procedure for the analysis of arbitrary shaped elastic bodies subjected to dynamic loads. The coupling is accomplished through equilibrium and compatibility considerations along the boundary element — finite element interface. Several numerical studies are performed where one part of a uniform body is treated by finite elements, whereas the remaining region is descretized by boundary elements. The examples demonstrate the influence of different finite element approaches and the applicability and the accuracy of the proposed procedure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00373797
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Ausbreitung transienter akustischer Wellen-Untersuchungen mit einer Zeitschritt-Randelementmethode (1989)
    Springer
    Archive of applied mechanics 59 (1989), S. 17-31 
    Details
    ISSN: 1432-0681
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Summary By using Graffi's reciprocal theorem a time-dependent integro-differential equation and therefrom a time step boundary element method is derived. It is applicable to arbitrary compressible but non-viscous fluids (acoustic media), especially suitable for determining transient pressure waves in infinite or semi-infinite domains. As an application of the method, a reservoir-dam system is analyzed, especially considering the influence of the topography and of the dynamic interaction with the soil.
    Notes: Übersicht Unter Benutzung des Reziprozitätssatzes von Graffi wird eine zeitabhängige Integro-Differen-tialgleichung und daraus eine Zeitschritt-Randelementmethode hergeleitet. Sie ist bei beliebigen kompressiblen, nicht-viskosen Flüssigkeiten (akustischen Medien) anwendbar und besonders zur Ermittlung transienter Druckwellen in unendlichen oder halb-unendlichen Gebieten geeignet. Als Anwendung wird das Staudammproblem, dabei vor allem der Einfluß der Topographie und der dynamischen Interaktion mit dem Untergrund untersucht.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00536628
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Some observations on time domain and frequency domain boundary elements (1990)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 29 (1990), S. 785-800 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: The numerical solution of problems in elastodynamics involving infinite media calls for the use of discrete techniques such as the boundary element method and the finite element method. These techniques can, in turn, be formulated in the time or frequency domains, and have each relative merits and drawbacks. This paper presents a comparative study of the accuracy and limitations of three different implementations of these methods.The problem studied is that of transient loads on the surface of homogeneous elastic halfspaces, and of finite depth strata. In each case, the response is computed first for an uninterrupted (continuous) medium, and then for a medium that includes a trench (or cavity).Three independent computer programs were used that incorporated the following methods: (i) frequency domain boundary element method (FD-BEM), using a discrete fundamental solution; (ii) time domain boundary element method (TD-BEM) using an analytical fundamental solution; and (iii) a coupled time domain boundary element-finite element model (BEM/FEM).It is found that for convex domains (halfspace or stratum without a trench) the three independent implementations are in excellent agreement, while for non-convex domains (trench in the path of the waves), numerical errors associated with non-causal behaviour become evident in some cases.
    Additional Material: 23 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620290408
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  • 4
    Electronic Resource
    Electronic Resource
    On FEM-BEM coupling for fluid-structure interaction analyses in the time domain (1991)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 31 (1991), S. 1151-1168 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: The investigation of coupled fluid-structure systems, subjected to dynamic loads, calls for the use of discrete techniques such as the finite element method (FEM) and the boundary element method (BEM). This paper reports on the development of a FEM-BEM coupling procedure, where finite elements are used to model the linear elastic structure, while the adjacent fluid is represented by boundary elements. The new approach is formulated entirely in the time domain to be extensible to non-linear problems.Various numerical calculations are presented which clearly demonstrate the applicability and the merits of the hybrid method. The obtained results are in excellent agreement with solutions stemming from a boundary element analysis which uses subdomain techniques.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620310609
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    Paper (German National Licenses)
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