A frequency independent criterion for describing sound absorbing materials by a limp frame model

Doutres, Olivier, Dauchez, Nicolas, Génevaux, Jean-Michel and Dazel, Olivier. 2009. « A frequency independent criterion for describing sound absorbing materials by a limp frame model ». Acta Acustica united with Acustica, vol. 95, nº 1. pp. 178-181.
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Abstract

This paper proposes a criterion to determine if an absorbing porous material can be modeled with the ”equivalent fluid” limp model instead of Biot model. The limp model is derived from Biot theory assuming that the porous frame has no bulk stiffness. The proposed criterion offers a practical simplification of the frequency dependent criterion defined previously by the authors: it depends only on the bulk modulus of the frame and on its porosity. Frequency independent critical values, below which the effect of the frame stiffness can be neglected, are determined for the whole considered frequency range [1 − 10 000 Hz]. The critical values are gathered in charts for different porous thicknesses and two configurations: sound absorption of a porous layer backed by a rigid backing and sound radiation of a plate covered by a porous layer. Its is shown that the derived criterion matches Beranek criterion but it is less restrictive.

Item Type:	Peer reviewed article published in a journal
Professor:	Professor Doutres, Olivier
Affiliation:	Autres
Date Deposited:	28 Oct 2014 15:20
Last Modified:	29 Nov 2017 19:28
URI:	https://espace2.etsmtl.ca/id/eprint/8785

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