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Attenuation of a resonant dissipative silencer in a rigid duct

✍ Scribed by Thomas J. Trella; Peter K. Kasper

Book ID
102632373
Publisher
Elsevier Science
Year
1974
Tongue
English
Weight
460 KB
Volume
7
Category
Article
ISSN
0003-682X

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✦ Synopsis

SUMMA R Y

Soundimenuation characteristics of a resonant-type dissipative silencer consisting of a reactive chamber with a porous facing have been considered. Such a silencer provides a high degree of attenuation within a narrow frequency range. Predicted attenuation values are compared with experiment for plane waves propagating in a rigid duct containing the dissipative silencer. The sound fieM is described by one-dimensional acoustical expressions taking into account the effect of boundary conditions and the presence of the silencer. The theoretical model incorporates the acoustical properties of porous materials and inertance of the sound field in the duct adjacent to the silencer. Good agreement was achieved between theoretical predictions and actual measurements. Results presented indicate the dependence of the attenuation spectrum upon flow resistivity and thickness of the porous material.

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