Efficient, wide-band rigid-body and elastic scattering computations using transient equivalent sources

A previous paper by the author has shown that transient structural-acoustic problems can be solved using time stepping procedures with the structure and fluid modeled using finite elements and equivalent sources, respectively. Here, the analysis is extended to included scattering problems. Although scattering problems have been discussed extensively in the literature, the current formulation is unique because the acoustic coupling matrix is treated as sparse. Also, most of the previous analyses have assumed the problem is time harmonic, and there is an advantage to performing the computations in the time domain because only a limited number of time steps are required to obtain wideband frequency resolution. This is especially true if the main emphasis is on the mid- to high-frequencies since the ringing response is typically dominated by the lowest frequency modes. Several examples are solved to validate the computations and to document the computation times and solution accuracy.

Copyright 2019 Acoustical Society of America. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the Acoustical Society of America.

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Work Title Efficient, wide-band rigid-body and elastic scattering computations using transient equivalent sources
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Open Access
Creators
  1. John B. Fahnline
License In Copyright (Rights Reserved)
Work Type Article
Publisher
  1. The Journal of the Acoustical Society of America
Publication Date October 1, 2019
Publisher Identifier (DOI)
  1. https://doi.org/10.1121/1.5125424
Deposited March 16, 2024

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Version 1
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  • Created
  • Added transient_elastic_scattering-with_line_numbers.pdf
  • Added Creator John B. Fahnline
  • Published
  • Updated Publisher, Publication Date Show Changes
    Publisher
    • Journal of the Acoustical Society of America
    • The Journal of the Acoustical Society of America
    Publication Date
    • 2019-09-01
    • 2019-10-01
  • Updated