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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/24363

Title: A new concept of modal participation factor for numerical instability in the dual BEM for exterior acoustics
Authors: J.T. Chen;K.H. Chen;I.L. Chen;L.W. Liu
Contributors: NTOU:Department of Harbor and River Engineering
Keywords: Modal participation factor;Fictitious frequency;Exterior acoustics;Dual BEM;Scattering
Date: 2003-03
Issue Date: 2011-10-20T08:11:45Z
Publisher: Mechanics Research Communications
Abstract: Abstract:This paper presents the occurring mechanism why irregular frequencies are imbedded in the exterior acoustics using the dual boundary element method (BEM). The modal participation factor which dominates the numerical instability is derived for continuous and discrete systems. In addition, the irregular (fictitious) frequencies embedded in the singular or hypersingular integral equations are discussed, respectively. It is found that the irregular values depend on the kernels in the integral representation for the solution. A two-dimensional dual BEM program for the exterior acoustics was developed. Numerical experiments are conducted to verify the concept of modal participation factor. (C) 2002 Elsevier Science Ltd. All rights reserved.
Relation: 30(2), pp.161-174
URI: http://ntour.ntou.edu.tw/handle/987654321/24363
Appears in Collections:[河海工程學系] 期刊論文

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