Technical Papers and Presentations

The elastic and geometrical properties of Low Density Polyethylene (LDPE) foam are used in this paper to improve the attenuation properties of periodic arrangements of acoustic scatterers known as Sonic Crystals (SCs). A specific recycled profile of LDPE foam is used as elastic-acoustic scatterer. The acoustic spectrum of the single scatterer shows two attenuation peaks in the low frequency range. If the elastic scatterers are arranged as a SC, the attenuation spectrum shows the attenuation peaks of the single scatterers at the same position, as well as the attenuation peaks related to the periodicity of the structure. COMSOL Multiphysics® is used to reproduce numerically the frequency response measured experimentally for both the single scatterers and the periodic arrangement. The results provided by COMSOL are in good agreement with the experimental data.