Acoustic absorption of non-homogeneous poro-elastic materials

Celse K. Amédin, Noureddine Atalla, Franck Sgard

Abstract


A model to evaluate the acoustic absorption performance of configurations consisting of a porous material, bonded onto the hard termination of a semi-infinite rectangular waveguide is presented. A power balance approach is used to evaluate the performance of the porus material using the absorption coefficient. An experimental validation is performed for a macro-perforated material, which consists in a mineral wool with periodic holes containing air. The absorption coefficient of non-homogeneous porous-elastic layers is predicted.

Keywords


Finite element method; Mathematical models; Mineral wool; Porous materials; Tensile stress; Waveguides; Biot theory

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