浮筏系统频率响应灵敏度分析

FREQUENCY RESPONSE FUNCTION SENSITIVITY ANALYSIS OF A FLOATING RAFT SYSTEM

本文介绍了一种频率响应函数灵敏度分析计算的新方法。该方法运用模态叠加法，在第一次频率响应计算的基础上，再次运用模态叠加法，第二次计算频率响应，求得系统在所要求的激励点和响应点之间的频率响应函数对给定参数的灵敏度。其中，参数可以是属于某个有限单元的某个参数，也可以是属于一组单元或整个模型的某个参数，为以响应为目标的浮筏系统优化和振动控制提供了基础。

The conventional computation of frequency response sensitivity requires the inverse assembled matrix of frequency response function, which costs too much work. This paper proposed a new method, which based on the construction of a pseudo excitation force and calculation of frequency response function using mode superposition method. The numerical calculation of a floating raft system shows that much information can be obtained from the frequency response sensitivity analysis.