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Title: Transmission loss predictions for dissipative silencers of arbitrary cross section in the presence of mean flow
Authors: Kirby, R
Keywords: Dissipative silencers;Mean flow;Arbitrary cross section;Point collocation;Automotive silencer
Issue Date: 2003
Publisher: American Institute of Physics
Citation: Journal of the Acoustical Society of America 114 (1): 200 - 209, Jul 2003
Abstract: A numerical technique is developed for the analysis of dissipative silencers of arbitrary, but axially uniform, cross section. Mean gas flow is included in a central airway which is separated from a bulk reacting porous material by a concentric perforate screen. The analysis begins by employing the finite element method to extract the eigenvalues and associated eigenvectors for a silencer of infinite length. Point collocation is then used to match the expanded acoustic pressure and velocity fields in the silencer chamber to those in the inlet and outlet pipes. Transmission loss predictions are compared with experimental measurements taken for two automotive dissipative silencers with elliptical cross sections. Good agreement between prediction and experiment is observed both without mean flow and for a mean flow Mach number of 0.15. It is demonstrated also that the technique presented offers a considerable reduction in computational expenditure when compared to a three dimensional finite element analysis.
ISSN: 0001-4966
Appears in Collections:Mechanical and Aerospace Engineering
Dept of Mechanical Aerospace and Civil Engineering Research Papers

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