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A numerical method for the calculation of dynamic response and acoustic radiation from an underwater structure

机译：一种计算水下结构动力响应和声辐射的数值方法

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摘要

An approach combining finite element with boundary element methods is proposed to calculate the elastic vibration and acoustic field radiated from an underwater structure. The FEM software NASTRAN is employed for computation of the structural vibration. An uncoupled boundary element method, based on the potential decomposition technique, is described to determine the acoustic added mass and damping coefficients that result due to fluid loading effects. The acoustic matrices of added mass and damping coefficients are then added to the structural mass and damping matrices, respectively, by the DMAP modules of NASTRAN. Numerical results are shown to be in good agreement with experimental data. The complex eigenvalue analyses of underwater structure are obtained by NASTRAN solution sequence SOL107. Results obtained from this study suggest that the natural frequencies of underwater structures are only weakly dependent on the acoustic frequency if the acoustic wavelength is roughly twice as large as the maximum structural dimension. (c) 2004 Elsevier Ltd. All rights reserved.
机译：提出了一种将有限元与边界元相结合的方法来计算水下结构辐射的弹性振动和声场。有限元软件NASTRAN用于计算结构振动。描述了一种基于势能分解技术的非耦合边界元方法，用于确定由于流体载荷效应而产生的声学附加质量和阻尼系数。然后，通过NASTRAN的DMAP模块将质量和阻尼系数相加的声学矩阵分别添加到结构质量和阻尼矩阵中。数值结果表明与实验数据吻合良好。通过NASTRAN解序列SOL107获得了水下结构的复杂特征值分析。从这项研究获得的结果表明，如果声波波长大约是最大结构尺寸的两倍，则水下结构的固有频率仅对声波频率有微弱的依赖。 （c）2004 Elsevier Ltd.保留所有权利。

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