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

摘要：

对于水声特性的研究有很多，但目前主要集中在其传声及反射声特性的研究。有关水与其他吸声材料复合使用时吸声特性的研究和报道很少。基于架空薄膜吸声原理，提出在架空薄膜上铺水膜的新型构造和通过改变水膜厚度调节复合材料吸声特性的方法。 并利用混响室法实验测试该复合结构的扩散吸声系数，测试结果很好地说明了该复合材料具有较好的吸收低频声能力，且吸收特性与水膜厚度有关。

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