Acoustic performances of silicone foams for sound absorption
Résumé
The aim of this study is the investigation of the link between the elaboration process, the microstructure and the acoustic behaviour of silicone foams obtained using a two-component silicone. Different parameters are varied such as the ratio of components, the addition of a thinning agent and the curing temperature, with the objective of understanding the in uence of each parameter in
the foam's acoustic absorption. The microstructure is analysed using SEM and acoustic properties are measured. Two non-acoustical properties of the porous material are also investigated, namely the porosity and the ow resistivity. Pore cell size and inter-connected porosity have great impact on acoustical properties. Significant enhancements of the absorption properties could be obtained in the low frequency band by increasing the rate of agent B through an increase in the amount of interconnected porous cells. An improvement in absorption is observed in the higher frequency range when a thinning agent is added to the mixture. Representative models of the foam for acoustic simulations are obtained allowing estimation of the tortuosity, viscous and thermal characteristic length from acoustic measurements. These models are able to simulate the acoustic behaviour of the silicone foams when embedded in sound packages.
Domaines
Mécanique [physics]
Origine : Fichiers produits par l'(les) auteur(s)
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