先进上面级动特性分析及结构动力学改进设计  

Analysis and Improved Design of Structural Dynamics for An Advanced Upper Stage

作　　者：胡伟峰[1] 申麟[1] 杨建民[1] 赫武乐[1] 

机构地区：[1]中国运载火箭技术研究院研究发展中心,北京100076

出　　处：《导弹与航天运载技术》2010年第3期1-7,共7页Missiles and Space Vehicles

摘　　要：先进上面级及有效载荷尺寸及质量较大,固有频率较低。上面级与运载火箭的级间分离、多星发射时的星箭分离冲击、推进剂晃动、发动机推力脉动、多星分离的不对称性、伺服系统动作及主发动机摇摆等加剧了振动环境条件,因此上面级结构的动力学问题将非常突出。应用有限元软件系统,对先进上面级结构动力学及静力学特性进行了预示。针对分析发现的局部模态现象和不合理的结构,进行了结构设计改进和结构布局优化,使得优化后的上面级的整体刚度有了明显改善。最后,根据优化结果,对上面级结构改进前后的动特性进行了对比分析。The weight and dimension of the advanced upper stage and its payload is relatively large,so it has lower natural frequencies.Serious vibrational environments will result form the upper stage separation,the shock and dissymmetry of multiple satellite sepration,the propellant sloshing,the thrust ripple of engineer,the startup of servo system,two-way swing of the engines.So the dynamic research is very crucial for the upper stage.The dynamics and statics characteristics are predicted on FEM soft system.According to the mode localization and local unreasonable structure,the design of part structure and layout is optimized,and the rigidity of the upper stage is improved.Finally,comparative analysis is presented for the dynamic characteristics of the advanced upper stage after improvement.

关 键 词：结构动力学 有限元 先进上面级 

分 类 号：V421.7[航空宇航科学与技术—飞行器设计]