薄膜閉空間構造を内包した高性能二重壁の音響透過損失

抄録

We report sound transmission loss of double wall structures included thin film cells. Experiments have shown that this double walls have higher sound insulation performance than double wall separated by air space. Transmission loss of double wall structures included thin film cells were calculated by numerical analysis using FEM and transfer matrix method (TMM). By numerical analysis, assuming that the sound wave is refracted inside the thin film cells and converted from oblique incidence to vertical, the transmission loss of the experiment and calculation agree well.