STUDY ON ACOUSTIC PROPERTY OF HIGH POROSITY OPEN-CELL FOAMS BY HOMOGENIZATION APPROACH
Keywords:Cellular material, cell size, permeability, tortuosity, effective and absorption property
This paper demonstrates a homogenization approach to characterize the effect of cell size of open-cell foam materials on their acoustic properties such as effective density, effective bulk modulus, and sound absorption. The three-dimensional representative volume element of the local morphology of open-cell foams is first reconstructed. The homogenization technique is then employed to calculate the effective acoustic properties of the foam materials. After a validation step, the proposed numerical framework is finally adapted to investigate the cell size-induced effect on the acoustic properties of foam-based absorbers. The obtained results indicate that, for a given high porosity, the tuned cell size can bring the desired effective and sound-absorbing properties. For two considered layers, the averaging cell size in the range of 0.15-0.45 mm shows better acoustic performance with an absorption ability > 80 %.