Pipes with porous (permeable) walls have received the attention of several authors as a noise control element in automotive intake systems; however, a closed theory of sound transmission including the effect of the coupling of the internal and external acoustic fields and the presence of mean flow does not appear to be available. The present paper proposes an integro-differential system for the propagation of plane sound waves in pipes with porous walls, and presents its general numerical solution, as well as an approximate analytical solution. The predicted effect of the coupling between the internal and external acoustic fields in a circular pipe made of reinforced woven fabric walls is shown, and the transmission loss predictions are compared with the existing experimental data in the literature.
Sound transmission in pipes with porous walls
Schallübertragung in Rohren mit porösen Wänden
Journal of Sound and Vibration ; 329 , 25 ; 5346-5355
2010
10 Seiten, 6 Bilder, 7 Quellen
Article (Journal)
English
Sound transmission in pipes with porous walls
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