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Study of acoustic radiation from the finite double cylindrical shells with rigid rib underwater

机译：水下带刚性肋的有限双圆柱壳声辐射研究

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Finite cylindrical shells were widely used in many under water structures, whose acoustic radiation had been researched for 30 years. Most of the published investigators assumed the ribs as acoustic transparent, in which the acoustic influence of the ribs was not considered. In this presentation, a general approach is suggested to evaluate the acoustic radiation from the underwater finite double cylindrical shells with rings and ribs based on the assumption of acoustic rigid ribs. The vibration of the shell is obtained using the classical Donnell operator. Based on the assumption of acoustic rigid ribs, the interaction equations of fluid and structure consider the dominant forces between cylindrical shells and rings and ribs, such as radial forces, tangential and vertical forces, moments in circumferential direction. The influence of the blocking effect of the ribs in the acoustic field between shells is studied in this presentation. Referencing the solution of commercial software of finite element analysis, the numerical simulation under the acoustic rigid assumptions is better than the results under the acoustic transparent assumption in some frequency bands such as 140Hz-190Hz and 210Hz-230Hz, which corresponds to the natural frequencies of rib vibration in axial direction of cylindrical shells. It can be understood that the acoustic transparent assumption of ribs is available in the frequency band below 140Hz, while the acoustic rigid assumption of ribs can obtain more accurate results in the higher frequency band.
机译：有限圆柱壳广泛用于许多水下结构，其声辐射已经研究了30年。大多数已发表的研究者都认为肋骨是声学透明的，其中并未考虑肋骨的声学影响。在此演示文稿中，提出了一种通用方法，该方法基于声学刚性肋骨的假设，评估来自带有环和肋骨的水下有限双圆柱壳的声辐射。使用经典的Donnell算子可以得到壳体的振动。基于声学刚性肋的假设，流体和结构的相互作用方程考虑了圆柱壳与环和肋之间的主力，例如径向力，切向力和垂直力，圆周方向的力矩。在此演示中，研究了肋之间的声场中肋的阻挡效果的影响。参照有限元分析的商业软件解决方案，在与刚性频率相对应的某些频段（例如140Hz-190Hz和210Hz-230Hz）下，在声学刚性假设下的数值模拟要好于在声学透明假设下的结果。肋沿圆柱壳轴向振动。可以理解，在低于140Hz的频带中可以使用肋的透声假设，而在较高的频带中，肋的透声假设可以得到更准确的结果。

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