Abstract For floating bodies in shallow sea, the prediction of acoustic radiation requires consideration of complex acoustic environments. Generally, the influence of the sea surface, seabed and sound speed profile cannot be neglected. In this paper, a relevant calculation method in shallow sea considering the sound speed profile is developed by introducing the Green's function corresponding to a complex ocean acoustic environment into the three-dimensional sono-elasticity theory for ships. The inviscid, irrotational and compressible fluid, which can be regarded as an acoustic medium, is considered. The fluid load is taken into account by hydrodynamic coefficients during the fluid-structure coupling vibration analysis. The structural vibration response is obtained by the modal superposition method. The simple-source method is employed to calculate the acoustic field. The mirror method and the normal mode method are applied in the calculation of near-field and far-field Green's functions respectively. A series of numerical examples are given and the results are compared with those of the full FEM approach to verify the accuracy and applicability of the presented method.

中文翻译：

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考虑复杂海洋声环境的浅海浮体声辐射计算方法

摘要 对于浅海浮体，声辐射预测需要考虑复杂的声环境。一般来说，海面、海床和声速剖面的影响不可忽视。本文通过将复杂海洋声环境对应的格林函数引入船舶三维声弹性理论，发展了一种考虑声速剖面的浅海相关计算方法。考虑无粘性、无旋、可压缩的流体，可视为一种声学介质。在流固耦合振动分析过程中，流体载荷被流体动力系数考虑在内。结构振动响应通过模态叠加法获得。采用单源法计算声场。近场格林函数和远场格林函数的计算分别采用镜像法和法向模法。给出了一系列数值例子，并将结果与​​完整 FEM 方法的结果进行比较，以验证所提出方法的准确性和适用性。