Title: Effect of voids on the acoustics of perforated dissipative silencers

Authors: A. Selamet, M.B. Xu, I-J. Lee, N.T. Huff

Addresses: Department of Mechanical Engineering, The Center for Automotive Research, The Ohio State University, Columbus, Ohio 43210, USA. ' Department of Mechanical Engineering, The Center for Automotive Research, The Ohio State University, Columbus, Ohio 43210, USA. ' Department of Mechanical Engineering, The Center for Automotive Research, The Ohio State University, Columbus, Ohio 43210, USA. ' Owens Corning, Novi, Michigan 48377, USA

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.

Keywords: voids; perforated dissipative silencers; acoustics; vehicle noise; acoustic performance; transmission loss; void length; void location; fibrous material; acoustic attenuation.

DOI: 10.1504/IJVNV.2006.012785

International Journal of Vehicle Noise and Vibration, 2006 Vol.2 No.4, pp.357 - 372

Published online: 14 Mar 2007 *

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