内容：
根据声学边界元理论,本文在考虑海面和吸声海底的声反射作用基础上,对格林函数进行修正,建立波导域声辐射模型,并分析了浅海中圆柱壳的声辐射特性。研究发现吸声和刚性海底边界条件下圆柱壳的辐射声场有明显差别;可采用波导中点源格林函数预测圆柱壳的声辐射特性。结果表明边界反射作用随着圆柱壳离开海面或海底而减弱,随着场点离开圆柱壳而增强;且水深方向上声压呈周期性波动,其周期规律与海底边界类型无关。本文用声学点源的辐射叠加原理解释研究现象的产生机理,可为工程应用提供理论参考。 Based on the acoustic boundary element theory, this paper corrects the Green's function on the basis of the acoustic reflection of the sea surface and the sound-absorbing seabed, and establishes the acoustic radiation model in the waveguide domain, and analyzes the acoustic radiation characteristics of the cylindrical shell in the shallow sea. It is found that the radiated sound field of the cylindrical shell is obviously different under the condition of sound absorption and rigid seabed boundary. The acoustic radiation characteristics of the cylindrical shell can be predicted by the midpoint of the waveguide. The results show that the boundary reflection is weakened as the cylindrical shell leaves the sea surface or the seabed, and increases with the cylindrical surface, and the sound pressure fluctuates periodically in the water depth direction. The cycle rule is independent of the seabed boundary type. In this paper, the radiation superposition principle of acoustic point source is used to explain the mechanism of the research phenomenon, which can provide theoretical reference for engineering application.

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