Analytical approach for sound attenuation in perforated dissipative silencers with inlet/outlet extensions.
The acoustic attenuation performance of perforated dissipative circular expansion chambers with inlet/outlet extensions is investigated. The eigenvalues and eigenfunctions of the sound field are analytically determined in the extended inlet/outlet circular ducts, upstream/downstream end annular dissipative chambers, and the central perforated dissipative expansion chamber. Utilizing the continuity conditions of velocity/pressure at the interfaces the transmission loss is predicted by a two-dimensional analytical approach. For a specific configuration, such predictions are compared with both experiments and a three-dimensional computational solution based on the substructure boundary element technique, showing a reasonable agreement. The analytical results for the effect of the absorbent resistivity, duct porosity, and geometryon the acoustic attenuation performance are discussed in detail.
Selamet
A
A
Department of Mechanical Engineering and The Center for Automotive Research, The Ohio State University, Columbus, Ohio 43210, USA. selamet.1@osu.edu
Xu
M B
MB
Lee
I J
IJ
Huff
N T
NT