一种修改的B—H法及其应用

本文中提出了一种修改的Ｂｅｎｆｉｌｄ－Ｈｒｕｄａ法，它改善了主体部件模态基的独立性条件，允许主体部件的自由－自由状态模态参数直接参与综合过程，因而可以直接利用实验模态分析的结果，这使它有可能在星．简耕合分析中得到应用。算例表明，只要选取适当数量的基向量，本文方法的精度可满足工程要求，但是该法的综合效率低于Ｂ－Ｈ法，尚待改进。

A Revised B-H Method and Its Application

A revised Benfield-Hruda method is presented in this paper. The method improves the independence condition of modal base of main component and allows the free-free modal parameters of it totake part in synthesis, ther fore the results of test modal analysis can be used in modal synthesis directly.This characteristic makes the method be possible of being applied in the payload/launch vehicle couplinganalysis. It is also shown in examples that the accuracy for engineering application can be satisfied if appropriate number of base vectors are selected. But the coupling efficiency of it is lower than that of B-Hmethod, further improvement is required.