船舶结构振动模态综合法

有限元法是复杂结构振动分析的常用计算方法，但对于大型船舶结构用有限元法进行较高频率振动分析时，要求结构被划分成非常多的单元数以便获得详细的位移和应力特性，目前常用的计算机仍然无法对其进行计算。针对这个问题，提出了一种适用于具有弹性联接部件的大型结构振动分析模态综合法，它能够在有限的计算机设备资源的基础上分析计算大型结构较高频率的振动特性。实例计算表明，此方法是分析大型复杂结构振动的有效方法。

Modal Synthesis Method of Structural Vibration Analysis of Ship

The finite element method(FEM) is generally used to analyze the structural vibration of complicated systems. When FEM is used to analyze the structural vibration of a ship, it is mostly not feasible in high-frequency regime, as the required node numbers within each wavelength might lead to extremely large numbers of degrees of freedom. A modal synthesis method was proposed to accommodate the analysis of the structural vibration of a large structure with elastic-coupling parts. It can effectively treat the complicated system in which there exist rigid connection and flexible connection that is formed by elastic-coupling part and allow solution of very large problems with limited computer resources. The example shows that the method is effective for the analysis of structural vibration of a large structure.