基于频响函数综合的浮筏隔振系统误差传递分析

摘要

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。%The FRF-based substructuring method was used for vibration transmission prediction and uncertainty propa-gation analysis in a floating raft system. The effects of various commonly encountered uncertainties of substructure FRFs, such as measurement noise, reciprocity violation, negative imaginary part of the FRFs at the origin, on the modeling results were investigated. The effects of uncertainty propagation and amplification on the FRF’s result were analyzed. The uncer-tainty propagation was quantitatively analyzed using the moment method. The result was compared with that from Monte Carlo method. It shows that the moment method is of higher efficiency and accuracy.