Boundary Element Prediction of Sound Propagation in Ducts Containing Bulk Absorbing Materials

[+] Author and Article Information
A. F. Seybert

Department of Mechanical Engineering, 521 CRMS Building, University of Kentucky, Lexington, KY 40506-0108

R. A. Seman, M. D. Lattuca

Lexmark International, Inc., Lexington, KY 40511

J. Vib. Acoust 120(4), 976-981 (Oct 01, 1998) (6 pages) doi:10.1115/1.2893929 History: Received June 01, 1997; Online February 26, 2008


In this paper the sound propagation in a rectangular duct containing a bulk absorbing foam liner is investigated. The foam is characterized by the complex characteristic impedance and propagation constant which are measured using an improved two-cavity method. These quantities are used to predict the normal incidence impedance and absorption coefficient of the foam which is compared to measured data obtained using the ASTM E-1050 test method. The complex characteristic impedance and propagation constant are also used to predict the attenuation through a layer of foam in a plane-wave tube for which measured results are also available. Finally, the boundary element method is used to predict the attenuation of sound in a rectangular duct where one surface is replaced by a foam-filled cavity. Comparison with experiment is shown for several frequencies.

Copyright © 1998 by The American Society of Mechanical Engineers
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