Author(s)

R. Panneton & Y. Atalla

Abstract

An inverse experimental/numerical method for identification of the viscous and thermal characteristic lengths of air-saturated open-cell porous materials is dis- cussed. The inverse method is looked at as an optimization problem, where a merit function has to be minimized. The merit function is built using acoustic measurements and predictions of the acoustic refractive index from a mathemati- cal model for rigid porous materials. The minimization is based on the Leven- berg-Marquardt method for nonlinear least squares. Two validation examples show the applicability and the efficiency of the method. 1 Introduction Open-cell porous materials such as partially reticulated foam (see Figure 1) are commonly us

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