Abstract
Predicting the noise radiated from vibrating structures is important in the automotive, aerospace, construction equipment, and defense industries. In this paper a numerical implementation of the boundary element method (BEM) in solving the Helmholtz equation for acoustic analysis is presented. The developed code can use the results from a structural dynamic analysis performed by a general-purpose structural finite element code like NASTRAN, to predict the noise emitted from the vibrating structure. A new approach is introduced in this paper to numerically treat the singularity problem inherent in the boundary element methodology for acoustics. The integration scheme and the overdetermination technique used in this development are also presented. The developed computer code is verified by comparison to available analytical solutions. Two practical applications, a vehicle interior noise analysis and a transmission cover noise radiation analysis are presented. Finally, the Rayleigh integral method which is suitable for analyzing plane structures in a baffle is implemented into computer code as an alternative to the BEM formulation, and some verification analyses are presented.
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