A finite element solution of acoustic propagation in rigid porous media

被引:12
作者
Bermúdez, A [1 ]
Ferrín, JL [1 ]
Prieto, A [1 ]
机构
[1] Univ Santiago de Compostela, Dept Matemat Aplicada, Fac Matemat, Santiago De Compostela 15782, Spain
关键词
rigid frame; porous medium; finite element method;
D O I
10.1002/nme.1218
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
This paper deals with the acoustical behaviour of a rigid porous material. A finite element method to compute both the response to an harmonic excitation and the free vibrations of a three-dimensional finite multilayer system consisting of a free fluid and a rigid porous material is considered. The finite element used is the lowest order face element introduced by Raviart and Thomas, that eliminates the spurious or circulation modes with no physical meaning. For the porous medium a Darcy's like model and the Allard-Champoux model are taken into account. The numerical results show that the finite element method allows us to compute the response curve for the coupled system and the complex eigenfrequencies. Some of them have a small imaginary part but there are also overdamped modes. Copyright (C) 2004 John Wiley Sons, Ltd.
引用
收藏
页码:1295 / 1314
页数:20
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