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Article
Porous layer impedance applied to a moving wall: Application to the radiation of a covered piston
J. Acoust. Soc. Am. (2007)
  • Olivier Doutres, Ph.D.
  • Nicolas Dauchez
  • Jean-Michel Génevaux
Abstract
Modeling a porous layer mounted on a vibrating structure using acoustic impedance is investigated in this paper. It is shown that the use of surface impedance usually measured with the impedance tube method can provide an inaccurate estimation of the acoustic pressure radiated by the covered structure. The paper focuses on the derivation of an impedance, denoted the “transfer impedance,” which describes accurately the dynamic movement of the porous layer. Biot’s theory is used in the model to account for deformations in the thickness of the layer. Experimental validation is performed using a circular piston covered by a foam or a fibrous layer, radiating in an infinite half space. The radiation model including the transfer impedance shows close agreement with experimental data. Copyright (2007) Acoustical Society of America. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the Acoustical Society of America.
Publication Date
January, 2007
Citation Information
Olivier Doutres, Nicolas Dauchez and Jean-Michel Génevaux. "Porous layer impedance applied to a moving wall: Application to the radiation of a covered piston" J. Acoust. Soc. Am. Vol. 121 Iss. 1 (2007)
Available at: http://works.bepress.com/olivier_doutres/8/