Transmission loss predictions for dissipative silencers of arbitrary cross section in the presence of mean flow

Publication Type:
Journal Article
Citation:
Journal of the Acoustical Society of America, 2003, 114 (1), pp. 200 - 209
Issue Date:
2003-07-01
Full metadata record
Files in This Item:
Filename Description Size
JASA 114 2003.pdfAccepted Manuscript Version260.79 kB
Adobe PDF
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 that 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 the computational expenditure when compared to a three-dimensional finite element analysis. © 2003 Acoustical Society of America.
Please use this identifier to cite or link to this item: