固体火箭发动机随动推力作用下细长体亚临界试车及动力学失稳临界推力预示  

Subcritical trial and critical dynamic instability thrust prediction of slender body under solid rocket motor based follower thrust

作　　者：史晓鸣 侯凯宇 李海东 夏鹏 刘陆广 高阳 王志新 强科杰 赵志茹 SHI Xiao-ming;HOU Kai-yu;LI Hai-dong;XIA Peng;LIU Lu-guang;GAO Yang;WANG Zhi-xin;QIANG Ke-jie;ZHAO Zhi-ru(Shanghai Electro-Mechanical Engineering Institute,Shanghai 201109,China;Shanghai Academy of Spaceflight Technology,Shanghai 201109,China;Shanghai Space Propulsion Technology Research Institute,Shanghai 201109,China)

机构地区：[1]上海机电工程研究所,上海201109 [2]上海航天技术研究院,上海201109 [3]上海航天动力技术研究所,上海201109

出　　处：《振动工程学报》2023年第4期885-891,共7页Journal of Vibration Engineering

摘　　要：设计了随动推力作用下细长体模拟件试车试验系统,开展固体火箭发动机试车;理论推导了耦合模态频率差-推力关系的多项式,结合亚临界试车数据外推预示失稳临界推力。研究结果表明:理论分析与地面试验结果吻合,只需开展少数几次安全可控的亚临界试车试验,获取系统的振动响应数据,即可准确预测临界推力;亚临界试验验证了随动推力横向分量引起模态间的刚度耦合,对于弯曲振动明显的细长体飞行器,推力对结构的影响应视为随动载荷。A trial system for follower thrust acted on slender body test piece was designed and applied to solid rocket motor trial.The relational expression between coupled mode frequencies difference and thrust was theoretically derived.It was shown that theo⁃retical results agree with test data,and critical thrust can be predicted based on vibration data from a few of safe and controllable subcritical trials;stiffness coupling caused by transverse component of follower thrust is verified by subcritical trials;thrust should be considered as follower load for the slender vehicle with obvious bending vibration.

关 键 词：固体火箭发动机 随动推力 细长体 亚临界试车 稳定边界预示 

分 类 号：V435[航空宇航科学与技术—航空宇航推进理论与工程] V414.34