摘要
本文研究水和空气中由不同厚度的两层弹性板及消声橡胶共同组成的分层介质在斜入射时的声特性，并采用数值方法求解多层结构声场的线性方程组，得到反射、透射系数；当板的厚度远小于波长时，采用弹性薄壳振动模型和弹性波模型进行计算，它们的结果基本相同，但是薄壳振动模型更便于计算和理论分析；对系统反射系数和透射系数的计算结果表明，系统增加消声橡胶层后，极大地改变反射系数和透射系数的频率响应；频率升高，反射系数减小，并能有效地抑制高频共振的峰值．
In this paper, the sound fields in a multiple-layer structure for oblique incidence wave were studied, the structure located between water and air being composed of two elastic plates of different thickness and a rubber layer. For the single plate in water, the vibration model of a thin plate and elastic wave model of a finite-thickness plate are used to calculate the sound fields when the thickness of the plate is small in comparison with the elastic wavelength. The calculated results of the sound reflection and transmission coefficients of the plate for the two models are same, but the thin plate model is simpler in calculation and analysis. In multi-layer structure, it is found that the coefficients are greatly changed when the structure is covered with a rubber layer, the reflective sound decreases as frequency increases and the resonant peak value of the coefficients are controlled effectively.
出处
《应用声学》
CSCD
北大核心
1999年第4期8-12,共5页
Journal of Applied Acoustics
关键词
水声
多层结构
斜入射
声特性
Underwater acoustics, Multiple-layer structure, Oblique incidence, Sound characteristics
