A non-parametric fluid-equivalent approach for the acoustic characterization of rigid porous materials

Abstract

The acoustic characterization of porous materials with rigid solid frame plays a key role in the prediction of the acoustic behaviour of any dynamic system that incorporates them. In order to obtain an accurate prediction of its frequencydependent response, a suitable choice of the parametric models for each material is essential. However, such models could be inadequate for a given material or only valid in a specific frequency range. In this work, a novel non-parametric methodology is proposed for the characterization of the acoustic properties of rigid porous materials. This technique is based on the solution of a sequence of frequency-by-frequency well-posed inverse problems. Once a reduced number of experimental measurements are available, the proposed method avoids the a priori choice of a parametric model.

Sound Absorption Properties of Perforated Recycled Polyurethane Foams Reinforced with Woven Fabric

“…Results showed a good agreement between the measurements and the models. Recently, Carbajo et al used in [26] the double porosity media to acoustically model rigid porous materials.…”