中文摘要：

以载荷分析为主要内容,概述动态子结构法在航天工程中的应用。首先采用约束子结构模态综合法与超单元法进行全箭级器箭耦合载荷分析,给出器箭界面加速度条件、运载器和航天器的内部载荷;然后介绍采用航天器基础激励方法与超单元法,依据全箭级器箭耦合载荷分析给出的器箭界面加速度条件,进行航天器级的载荷二次分析,给出航天器的内部载荷,可以证明载荷二次分析所得航天器的内部载荷结果与全箭级器箭耦合载荷分析结果一样。由此说明航天器级载荷二次分析获得结果是可信的,也就是说全箭级器箭耦合载荷分析与航天器级载荷二次分析流程是合理的、可靠的。

英文摘要：

This paper demonstrates the application of the dynamic substructure method in the aerospace engineering.Our main focus is on the load analysis.First,the restraint modal synthesis method and the ultra-element method are applied to perform coupled loads analysis of a complete launch vehicle that is coupled with a spacecraft.As a result,the internal loads for a launch vehicle and its spacecraft,as well as the acceleration conditions of the interface between the spacecraft and the launch vehicle,are obtained.Second,based excitation approach and the ultra-element method for spacecraft,using the derived internal loads by the acceleration conditions of the interface between the spacecraft and the launch vehicle,to perform a secondary load analysis.It is proved that the internal load of the spacecraft that obtained from the secondary load analysis is consistent with the load obtained from the complete launch vehicle.Therefore,the two steps load analysis approach demonstrated in the paper can be considered as a reliable and robust approach for coupled load analysis.