Polymer foams (polyurethane) are well known porous materials with elastic frame. Many works have been done to evaluate these effective properties to predict the behavior of these types of materials. This model is characterized by the effective density and the compression modulus. The “equivalent fluid” model is often used to model these types of materials.
Because of the huge rigidity in their frames, only longitudinal waves can propagate inside the fluid phase. Metallic foams and fiber layers are common examples of materials having limp or rigid frame, respectively. According to their frame state, they can be classified to three types: elastic, rigid, or limp. Porous materials are materials well known for their promising applications in many areas, for example, in automotive and aeronautics they are mainly used to reduce noise level. The simulations show that these parameters have an influence on the sound absorption around the resonance frequency. Afterwards, we studied the effect of varying each mechanical parameter independently on the absorption in interval of ☒0%. The obtained results are compared together and show an excellent agreement. We calculated the absorption coefficient analytically using classical Biot formulation (, ) and numerically using Biot mixed formulation (, ) in 3D COMSOL Multiphysics. The aim of this work is to study the quality of acoustic absorption in polyurethane foam and to show the importance of the structural vibration of this foam on the absorption by varying mechanical parameters (Young’s modulus, Poisson’s coefficient, structural damping factor, and the density ). When the skeleton is set to motion, it is necessary to use generalized Biot-Allard model which takes into account the deformation of the skeleton and the fluid and the interactions between them.
Polymer foams have acoustic absorption properties that play an important role in reducing noise level.