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Mathematical Problems in Engineering
Volume 2013, Article ID 583079, 8 pages
Research Article

Low-Frequency Acoustic-Structure Analysis Using Coupled FEM-BEM Method

1School of Aerospace, Tsinghua University, Beijing 100084, China
2Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China
3China Academy of Space Technology, Beijing 100094, China

Received 19 July 2013; Accepted 5 September 2013

Academic Editor: Song Cen

Copyright © 2013 Jinlong Feng et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A numerical algorithm based on finite element method (FEM) and boundary element method (BEM) is proposed for the analyses of acoustic-structure coupled problems. By this algorithm, the structural domain and the acoustic domain are modelled by FEM and BEM, respectively, which are coupled with each other through the consideration of the appropriate compatibility and equilibrium conditions on the interface of the two domains. To improve the computational efficiency, the adaptive cross approximation (ACA) approach is incorporated into the proposed algorithm to deal with the nonsymmetric and fully populated matrices resulting from the coupling of the FEM and BEM. The validity and the high efficiency of the present approach are demonstrated by two examples.