A wave-based approach to estimate porous material properties

Mohamed Ichchou (1) , Olivier Bareille (1) , A Chettah (1)

1 LTDS - Laboratoire de Tribologie et Dynamique des Systèmes

The focus of this paper is the estimation of the acoustic properties of porous material by reconstructing the acoustic field. The proposed technique first estimates the wavenumber of the acoustic field. The incident and reflected wave components are then identified through cost function optimization, and the accuracy of the for- mulation is assessed. The surface impedance and acoustic absorption are evaluated for a number of porous materials. The non-acoustic parameters are thus derived using an inverse approach. The results show good correlation when compared to experiments. Within the framework of this study, foams and compound granulates were specifically tested.

Mots clés: porous material; wavenumber; inverse approach

Domaines: Acoustique [physics.class-ph]

Mohamed Ichchou, Olivier Bareille, A Chettah. A wave-based approach to estimate porous material properties. Acoustics 2012, Apr 2012, Nantes, France. ⟨hal-00811374⟩