基于频响函数综合的浮筏隔振系统误差传递分析

采用基于频响函数综合的子结构方法对浮筏隔振系统进行建模分析和误差传递分析。针对测试频响函数的一些常见误差，如测试噪声对频响函数幅值和相位的污染，同一子结构的频响函数不满足互易性，原点频响函数的虚部小于零等，分析其在综合时由于误差传递和放大效应对综合结果的影响。并采用矩方法对误差传递进行定量分析，将矩方法的结果和采用Monte Carlo方法的结果进行对比，结果表明矩方法具有较高的效率和精度。

Analysis of Uncertainty Propagation in Floating Raft System Using FRF-based Substructuring Method

The FRF-based substructuring method is investigated for predicting vibration transmission and uncertainty propagation in floating raft system. The effects of various commonly encountered errors of substructure FRFs, such as measurement noise, reciprocity violation, negative imaginary part of driving-point FRFs, on the modeling results are investigated. The uncertainty in substructure FRFs can be amplified due to the coupling process. Propagation of uncertainties of FRFs is quantified based on an analytical approximate moment method using the derivatives of substructure FRFs and variance defined on these parameters. The moment method is of high efficiency and accuracy compared with Monte Carlo probabilistic method.