关键词: 声学, 复合结构, 水膜, 架空薄膜, 混响室实验, 扩散吸声系数

Abstract:

Water’s acoustic properties have been studied a lot. However, these studies were mainly focused on water’s properties of sound reflection and dissemination. Studies of sound absorption properties of composite structures made of water and other soundabsorbing materials are very few. In this study, a resonant absorption principle based novel water filmair layered structure is developed. By changing the thickness of water film, the absorption of this new structure can be modulated. Moreover, reverberation time experiments in a real scale test installation are designed to quantify the new structures diffusion absorption coefficients. The result shows that this multilayered composite structure produces a good absorption for low frequency sound, and the absorption properties depend on the water film thickness.

Key words: acoustics, composite structure, water film, filmair layered structure, reverberation time experiments, diffusion absorption coefficient