Effect of voids on the acoustics of perforated dissipative silencers
by A. Selamet, M.B. Xu, I-J. Lee, N.T. Huff
International Journal of Vehicle Noise and Vibration (IJVNV), Vol. 2, No. 4, 2006

Abstract: The effect of voids on the acoustic performance of a perforated dissipative expansion chamber is investigated by axially staggering filled/empty segments external to the perforations. A two-dimensional analytical approach is used to determine the Transmission Loss (TL) through pressure and velocity matching at the boundaries of the inlet/outlet ducts, rigid end-plates, and the interfaces between the fibrous material and void. The analytical results are then compared with the experiments and numerical predictions for one specific configuration, showing a reasonable agreement. The effects of void length and location, and the properties of fibrous material on the acoustic attenuation of this perforated dissipative expansion chamber are also discussed.

Online publication date: Wed, 14-Mar-2007

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