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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, we study the acoustic properties of layered media composed of two layers of elastic plates and anechoic rubber with different thicknesses in water and air under oblique incidence, and use the numerical method to solve the linear equations of the multi-layer structure sound field. The reflection, When the thickness of the plate is far less than the wavelength, the vibrational model and the elastic wave model are used to calculate the thin shells. The results are basically the same, but the shell vibration model is more convenient for calculation and theoretical analysis. The reflection coefficient and the transmission coefficient The calculated results show that the frequency response of the reflection coefficient and the transmission coefficient are greatly changed after the rubber layer is added into the system; the frequency increases, the reflection coefficient decreases, and the peak of the high-frequency resonance can be effectively suppressed.