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Study on calculation methods for acoustic radiation of axisymmetric structures in finite water depth
Journal of Fluids and Structures ( IF 3.6 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.jfluidstructs.2020.103115
He Huang , Ming-Song Zou , Ling-Wen Jiang

Abstract In this paper, a kind of FEM–WSM (Finite Element Method–Wave​ Superposition Method) is used to calculate the acoustic radiation of axisymmetric structures in finite water depth. FEM is used to solve the dry modes of axisymmetric structures, and WSM is applied along with the dry mode method to consider fluid–structure interaction effects and calculate the acoustic radiated field. This method combines the advantages of FEM and WSM. On one hand, it is suitable for complex or large axisymmetric structures on the one hand. On the other hand, it has higher computational efficiency than the FEM, and the computational domain size for the water is not limited. As long as the Green’s function is tailored for the boundary condition, the acoustic radiated field of axisymmetric structures in more complex ocean acoustic environments can be calculated by using this method. Besides, a least-square method is used to reduce the distortion resulting from computational errors of the modal estimates. The influence of the number of source and field points and the finite element mesh density on the calculation accuracy are discussed, eliciting some disciplinary conclusions. Using a spherical shell and a capsule shell as models, the results from the present approach, a semi-analytical method, and the crude FEM are compared to verify the correctness and efficiency. Based on numerical examples, the influence of the sea surface and the seafloor on the acoustic radiated field of structures in finite water depth is also analyzed.

中文翻译:

有限水深轴对称结构声辐射计算方法研究

摘要 本文采用一种FEM-WSM(Finite Element Method-Wave Superposition Method)方法计算有限水深轴对称结构的声辐射。有限元法用于求解轴对称结构的干模,WSM 与干模法一起用于考虑流固耦合效应并计算声辐射场。这种方法结合了 FEM 和 WSM 的优点。一方面,它一方面适用于复杂或大型的轴对称结构。另一方面,它比有限元法具有更高的计算效率,并且对水的计算域大小不受限制。只要格林函数是为边界条件量身定做的,使用该方法可以计算更复杂的海洋声环境中轴对称结构的声辐射场。此外,最小二乘法用于减少由模态估计的计算误差导致的失真。讨论了源点和场点的数量以及有限元网格密度对计算精度的影响,得出了一些学科结论。使用球壳和胶囊壳作为模型,将本方法、半解析方法和原始有限元法的结果进行比较,以验证正确性和效率。结合数值算例,分析了海面和海底对有限水深结构声辐射场的影响。最小二乘法用于减少由模态估计的计算误差导致的失真。讨论了源点和场点的数量以及有限元网格密度对计算精度的影响,得出了一些学科结论。使用球壳和胶囊壳作为模型,将本方法、半解析方法和原始有限元法的结果进行比较,以验证正确性和效率。结合数值算例,分析了海面和海底对有限水深结构声辐射场的影响。最小二乘法用于减少由模态估计的计算误差导致的失真。讨论了源点和场点的数量以及有限元网格密度对计算精度的影响,得出了一些学科结论。使用球壳和胶囊壳作为模型,将本方法、半解析方法和原始有限元法的结果进行比较,以验证正确性和效率。结合数值算例,分析了海面和海底对有限水深结构声辐射场的影响。得出一些纪律性结论。使用球壳和胶囊壳作为模型,将本方法、半解析方法和原始有限元法的结果进行比较,以验证正确性和效率。结合数值算例,分析了海面和海底对有限水深结构声辐射场的影响。得出一些纪律性结论。使用球壳和胶囊壳作为模型,将本方法、半解析方法和原始有限元法的结果进行比较,以验证正确性和效率。结合数值算例,分析了海面和海底对有限水深结构声辐射场的影响。
更新日期:2020-10-01
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