Author(s)

T. W. Wu, G. Lou & C.Y.R. Cheng

Abstract

A substructure boundary element method for packed silencers T. W. WU', G. LOU' & C. Y. R. cheng2 I Department of Mechanical Engineering, University of Kentucky, Lexington, U. S. A. 2 Nelson Industries, Inc., Stoughton, U. S. A. Abstract Substructuring has been a classical technique in structural FEM analysis to reduce the matrix size and the computation time. In this paper, a substructuring technique based on the impedance matrix synthesis is used along with the recently developed direct mixed-body BEM to evaluate the transmission loss (TL) of packed silencers. Due to the single-domain nature of the direct mixedbody BEM, each substructure does not need to be a homogeneous domain. Complex internal components such as extended inletloutlet tubes, perforated tubes, and thin baffles, as well as bulk-reacting linings, can all be in one single substructure. As such, dividing a large silencer into modular substructures can be done naturally in the longitudinal direction. The substructuring technique

Keywords