Wideband acoustic modulation using periodic poroelastic composite structures
We proposed an effective acoustic abatement solution comprised of periodic resonators and multi-panel structures with porous lining, which incorporates the wideband capability of porous materials and the low-frequency advantage of locally resonant structures together. Theoretical model and numerical implementation are developed and validated. Two-dimensional poroelastic field expressions are used and resonator forces are incorporated. The results agree well with those reported in the literature and the results obtained from the finite element method. It turns out that sound insulation concerning both the amplitude and tuning bandwidth can be achieved effectively using porous additions and locally-resonant designs. This study presents a promising and practical alternative for wideband acoustic modulation.