Acoustic Properties Study of Anisotropic Porous Materials Through the Biot Model Applied with a Finite Element Model

Abstract

The available information about the acoustic properties of current building industry materials, specifically porous materials, is scarce, and the models that describe their properties are mostly empirical or oversimplified, e.g., the equivalent fluid models. This study works with a glass wool sample, described through the Biot model, which explains the interaction between the fluid and the porous matrix in more detail, where the equivalent density and bulk modulus of the material are obtained through the Johnson-Champoux-Allard model. The models consider the anisotropy of the airflow resistivity and elastic parameters of the porous material, and they are followed by a sensitivity study. The models are implemented through a finite element modeling tool, and the results of the study show the most important parameters in this specific situation. The final model may provide a more general tool for optimizing the materials.