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BOTTOM-UP APPROACH FOR MICROSTRUCTURE OPTIMIZATION OF SOUND ABSORBING MATERIALS

BOTTOM-UP APPROACH FOR MICROSTRUCTURE OPTIMIZATION OF SOUND ABSORBING MATERIALS

par Perrot Camille - Groupe d’Acoustique de l’Université de Sherbrooke Sherbrooke, Québec J1K 2R1, Canada

le lundi 17 septembre à 16:00 Salle IAM 4ième étage

ABSTRACT :

A major issue in building acoustics concerns the need to increase or adapt the absorption spectrum of commonly used sound absorbing materials. However, the most advanced models used to characterize and predict sound absorbing material performances are based on macroscopic parameters, which are inter-dependant, and do not take explicitly into account the local geometry description of the porous media, i.e. microstructure. For these reasons, optimizing sound absorbing material performances firstly relies on our ability to predict acoustic properties of porous media from the description of their local geometry, and secondly to propose pertinent physically realistic modifications of the microstructure having predictable impacts on the absorption spectrum. Starting from an open-cell foam sample having poor sound absorption properties, this paper exposes how the link between microstructure and macrobehavior is achieved, and how its sound absorption is increased from the optimization of its microstructure.

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