Open AccessBoundary Element Analysis of Reactive Mufflers and Packed Silencers with Catalyst Converters
Author(s) -
Tao Wu,
C. Y. R. Chen
Publication year - 2007
Publication title -
electronic journal of boundary elements
Language(s) - English
Resource type - Journals
ISSN - 1542-3891
DOI - 10.14713/ejbe.v1i2.759
Subject(s) - muffler , silencer , boundary element method , boundary (topology) , converters , computer science , substructure , domain (mathematical analysis) , modular design , integral equation , finite element method , mathematics , mathematical analysis , mechanical engineering , engineering , structural engineering , electrical engineering , voltage , inlet , operating system
This paper reviews recent developments in the application of the boundary element method (BEM) to muffler and silencer analysis. Initial results of modeling built-in catalyst converters are also presented. A so-called “direct mixed-body boundary element method� has been developed for muffler and silencer analysis since 1996. The idea of the method is to integrate all kinds of different boundary and internal surfaces into a single integral equation set without using the conventional multi-domain approach, even though there may be different media in the domain. A key ingredient in this method is the hypersingular integral equation. The concept of the direct mixedbody BEM is not totally against the conventional multi-domain BEM, though. For very large structures or at high frequencies, a multi-domain or substructuring approach is still necessary in order to reduce the memory usage as well as the computation time. With the direct mixed-body BEM, each substructure does not need to be a well-defined and homogeneous subdomain. As such, substructuring can be done more naturally along the longitudinal direction. Catalyst converters may also be modeled as a modular in the general framework of substructuring. Several test cases are presented with experimental verification, including two cases with built-in converters.