Noise control strategies using composite porous materials – Simulations and experimental validations on plate/cavity systems

This paper examines the potential of using composite porous materials to design robust noise control packages. Composite porous are meso-perforated porous materials in which perforations are filled with another porous material. The work presented here shows that the association of two carefully selected materials could lead to interesting combined properties of sound absorption and sound insulation. A canonical plate/cavity system excited with an internal acoustic source is chosen to illustrate the potential of these materials for noise enclosures. The coupled problem is solved using Finite Element Method. The sound propagation in composite porous materials is described by Biot-Allard’s poroelasticity equations. Noise reductions obtained using composite porous are compared to those obtained using homogeneous materials. The sound powers dissipated into the system are also examined to give further insights into the physics of the involved phenomena. The results show that the achieved performances take full benefit of the efficiencies of either materials which form the composite porous for different frequency ranges