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Modeling sound scattering using a combination of the edge source integral equation and the boundary element method

Martin Roman, Sara-Regina; Svensson, U. Peter; Slechta, Jan; Smith, Julius O.
Journal article, Peer reviewed
Accepted version
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Martin Roman (1.503Mb)
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http://hdl.handle.net/11250/2589024
Utgivelsesdato
2018
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  • Institutt for elektroniske systemer [1526]
  • Publikasjoner fra CRIStin - NTNU [19694]
Originalversjon
Journal of the Acoustical Society of America. 2018, 144 131-141.   10.1121/1.5044404
Sammendrag
A hybrid method for sound scattering calculations is presented in this paper. The boundary element method (BEM) is combined with a recently developed edge source integral equation (ESIE) [J. Acoust. Soc. Am. 133, 3681–3691 (2013)]. Although the ESIE provides accurate results for convex, rigid polyhedra, it has several numerical challenges, one of which applies to certain radiation directions. The proposed method, denoted ESIEBEM, overcomes this problem with certain radiation directions by applying a similar approach as BEM. First, the sound pressure is calculated on the surface of the scattering object using the ESIE, and then second, the scattered sound is obtained at the receiver point using the Kirchhoff-Helmholtz boundary integral equation, as BEM does. The three methods have been compared for the scattering by a rigid cube. Based on results from several discretizations, ESIE and ESIEBEM results are typically (90% quartile) within 3–4 · 10−4 for a kL-value of 1.83 and 2 · 10−3 for kL = 9.15, L being the cube length, of reference results computed with the BEM. The computational cost of ESIEBEM appears to be lower than BEM.
Utgiver
Acoustical Society of America
Tidsskrift
Journal of the Acoustical Society of America

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