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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/24348

Title: Boundary collocation method for acoustic eigenanalysis of three-dimensional cavities using radial basis function
Authors: J. T. Chen;M. H. Chang;K. H. Chen;I. L. Chen
Contributors: NTOU:Department of Harbor and River Engineering
Date: 2002-10-01
Issue Date: 2011-10-20T08:11:37Z
Abstract: abstract:In this paper, a theoretical formulation based on the collocation method is presented for the eigenanalysis of arbitrarily shaped acoustic cavities. This article can be seen as the extension of non-dimensional influence function (NDIF) method proposed by Kang et al. (1999, 2000a) extending from two-dimensional to three-dimensional case. Unlike the conventional collocation techniques in the literature, approximate functions used in this paper are two-point functions of which the argument is only the distance between the two points. Based on this radial basis expansion, the acoustic field can be represented more exactly. The field solution is obtained through the linear superposition of radial basis function, and boundary conditions can be applied at the discrete points. The influence matrix is symmetric regardless of the boundary shape of the cavity, and the calculated eigenvalues rapidly converge to the exact values by using only a few boundary nodes. Moreover, the method results in true and spurious boundary modes, which can be obtained from the right and left unitary vectors of singular value decomposition, respectively. By employing the updating term and document of singular value decomposition (SVD), the true and spurious eigensolutions can be sorted out, respectively. The validity of the proposed method are illustrated through several numerical examples.
Relation: 29(4-5), pp.392-408
URI: http://ntour.ntou.edu.tw/handle/987654321/24348
Appears in Collections:[河海工程學系] 期刊論文

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