多点随机激励振动试验的推力需求下限分析  

Lower limit of thrust load in vibration test with multi-point random excitation

作　　者：胡杰[1,2] 范宣华 HU Jie;FAN Xuanhua(Institute of System Engineering,China Academy of Engineering Physics;Key Laboratory of Engineering Material and Structure Impact and Vibration,Mianyang 621999,China)

机构地区：[1]中国工程物理研究院总体工程研究所 [2]工程材料与结构冲击振动四川省重点实验室,绵阳621999

出　　处：《航天器环境工程》2020年第6期546-551,共6页Spacecraft Environment Engineering

基　　金：国家自然科学基金资助项目(编号:11872059)。

摘　　要：针对载荷加载点与响应控制点数量相同的多点随机激励试验,进行多点响应与多点激励之间的传递关系理论分析,获得多点激励下控制载荷需求的表达式。采用遗传优化算法,开展对控制载荷推力需求的数值模拟,获得某典型结构在两点激励和三点激励等工况下的推力需求下限。结果表明,由于目前多点激励试验中只控制响应幅值,并不关注多点响应之间的相位差,使得控制载荷不唯一,这有利于实现对多个点的响应控制,同时需要通过合理的加载布局实现对加载设备能力的充分利用。In the multi-point random excited vibration test with the same number of the load points and the response control points,the transfer relations among those points are analyzed.The genetic algorithm is adopted for the numerical simulation of the lower limit of the required control thrust for the two-point and three-point excitation modes.Since the phase differences among the multi-point response are usually not taken as a control target,the choice of the multi-point excitation is not unique,allowing for a more flexible handling of test condition.Meanwhile,it is necessary to optimize the thrust force loading distribution for making a sufficient use of the load equipment.

关 键 词：随机振动 多点激励 功率谱密度 相位差 推力 数值仿真 

分 类 号：V416.2[航空宇航科学与技术—航空宇航推进理论与工程] O324[理学—一般力学与力学基础]