动态子结构方法在全箭动特性分析中的应用研究  

Applications of Dynamic Substructure Technology in Structural Dynamic Analysis of Launch Vehicle

作　　者：张忠[1] 韩丽[1] 任方[1] 李海波[1] 秦朝红[1] 

机构地区：[1]北京强度环境研究所可靠性与环境工程技术重点实验室,北京100076

出　　处：《载人航天》2014年第3期209-213,共5页Manned Spaceflight

基　　金：国家重大基础研究项目(613133)

摘　　要：液体推进剂质量对运载火箭全箭动力学特性有重要影响,其动力学建模是全箭动力学建模的难点和重点。结合航天工程实际,提出了采用虚质量法和动态子结构方法相结合的液体推进剂建模方法,减缩了计算模型自由度,提高了计算效率,实现了全箭动力学特性分析。最后,以某液体运载火箭为例,分析了不同液体推进剂建模方法对全箭动特性计算结果的影响。The mass of liquid propellant has significant effects on the structural dynamics of the launch vehicle .The dynamic modeling of liquid propellant is still one of the key and difficult prob-lems in dynamic analysis of launch vehicle .Considering the aerospace engineering practice , the modeling method of liquid propellant which combined the methods of virtual fluid mass and dynamic substructure was proposed .The method reduced the system DOF efficiently and increased the accu-racy , and was suitable for the analysis of the launch vehicle .In the end , taking strap-on launch ve-hicle as an example , the influences of different liquid propellant modeling methods on the results were studied .

关 键 词：结构动力学 动态子结构法 液体推进剂 航天工程 

分 类 号：V421.1[航空宇航科学与技术—飞行器设计]