Dynamic Characteristic Analysis of a 3-D Semi-Submerged Body as a Fluid-Structure Interaction System
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摘要: 对于采用位移-压力有限元格式从流固耦合系统导出的大型非对称矩阵特征值问题，构造出了一种新格式的迭代Arnoldi方法进行非对称特征值分析来获得浮式结构的动力特性．该迭代格式在克服零频的移频技术中，可以高效地计算出Arnoldi向量．实例分析结果表明，流固耦合作用对水上大型薄壁浮式结构动力特性具有重要影响．Abstract: An Arnoldi's method with new iteration pattern, which was designed for solving a large unsymmetric eigenvalue problem introduced by displacement-pressure FE pattern of a fluid-structure interaction system, was adopted here to get the dynamic characteristics of the semi-submerged body. The new iteration pattern could be used efficiently to obtain the Arnoldi's vectors in the shift-frequency technique, which was used for the zero-frequency problem. Numerical example showed that the fluid-structure interaction is one of the important factors to the dynamic characteristics of large semi- submerged thin-walled structures.
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