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Poster communications

Checking of an optimal sound absorbing structure

Abstract : A variety of performance demands are increasingly being placed on sound absorbing material systems. A bottom-up approach for microstructure optimization of long-wavelength sound absorbing materials was recently presented using hybrid estimates based on direct numerical evaluation of macroscopic parameters and analytical models [J. Acoust. Soc. Am. 124, 940 (2008)]. To illustrate the potential of such an optimization method, this methodology was applied to study the sound absorption properties of a two-dimensional and manufacturable hexagonal-like porous structure of motionless solid fibers. Results of this paper tend to demonstrate the existence of a microstructural configuration maximizing the area under the sound absorption spectrum, together with the optimal range of local characteristic lengths. This is a crucial conclusion, notably for foam and fibrous materials manufacturers, which need to be confirmed with a more general formulation proposed by Lafarge and provided in terms of two independent permeabilities including a thermal analog of the well known viscous dynamic one. This paper reports and quantifies differences obtained with the simplified and refined models. It is found that the optimal microstructural configuration is correctly estimated from a simplified model with only 3 % of uncertainty on the global performances. However, for very dilluted (large porosities) porous structures, the simplified model underestimates significantly the material performances with uncertainties reaching up to 30 %.
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https://hal-upec-upem.archives-ouvertes.fr/hal-00732578
Contributor : Camille Perrot <>
Submitted on : Saturday, April 20, 2013 - 3:13:50 PM
Last modification on : Wednesday, July 8, 2020 - 12:42:25 PM
Long-term archiving on: : Friday, March 31, 2017 - 1:10:18 PM

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  • HAL Id : hal-00732578, version 1

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Camille Perrot, F. Chevillotte, R. Panneton. Checking of an optimal sound absorbing structure. Symposium on the Acoustics of Poro-Elastic Materials (SAPEM 2008), Dec 2008, Bradford, United Kingdom. pp.89-91, 2008. ⟨hal-00732578⟩

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