摘要
为了确保遥感器能够承受发射过程中的力学环境,需要在地面对遥感器及其部组件进行充分的振动试验,随机振动试验是主要的试验方法之一。对于反射镜组件,除了需要关注常规的刚度和强度特性,还需要重点关注试验前后的面形变化。在多个型号的研制过程中,均出现过随机振动试验后反射镜组件面形发生退化的现象。因此,亟需研究随机振动试验引起的反射镜面形退化机理。文章通过对反射镜安装界面进行受力分析,研究了随机振动等效准静态加速度、连接刚度、预紧力以及摩擦力之间的关系。通过仿真分析发现横向残余应力是导致面形退化的主要因素,并给出了残余应力的估算公式。最后,结合某空间相机主镜组件的随机振动试验,验证了横向残余应力引起反射镜面形退化的机理。分析和试验结果表明,当达到产生横向残余应力的条件时,反射镜面形开始退化,横向残余应力越大,反射镜面形退化越严重。
In order to ensure that the remote sensor can withstand the mechanical environment in the launching process, it is necessary to conduct adequate vibration tests on the ground for the remote sensor and its components. Random vibration test is one of the main test methods. For the mirror assembly, attention should be paid to the conventional stiffness and strength characteristics, as well as to the surface figure change before and after the test. In the development of many models, the surface figure degradation of mirror assembly occurs after random vibration test. Therefore, it is urgent to study the mechanism of mirror surface figure degradation caused by random vibration test. In this paper, the relationship between equivalent quasi-static acceleration, connection stiffness, pre-tightening force and friction force of random vibration is studied by means of force analysis of mirror installation interface. Through the simulation analysis, it is found that the lateral residual force is the main factor leading to the surface figure degradation, and the estimation formula of the residual force is given. Finally, combined with the random vibration test of the main mirror assembly of a space camera, the mechanism of mirror surface figure degradation caused by transverse residual force is verified. The simulation and test results show that when the condition of producing transverse residual force is generated, the surface figure of the mirror begins to degenerate. The greater the transverse residual force is, the more serious the surface degeneration is.
作者
孔富家
白绍竣
陈祥
刘义良
乔玉莉
KONG Fujia;BAI Shaojun;CHEN Xiang;LIU Yiliang;QIAO Yuli(Beijing Institute of Space Mechanics & Electricity, Beijing 100094, China;North China Institute of Aerospace Engineering, Langfang 065000, China)
出处
《航天返回与遥感》
CSCD
2019年第5期58-66,共9页
Spacecraft Recovery & Remote Sensing
基金
国家重大科技专项工程
关键词
随机振动
空间反射镜
横向残余应力
面形退化
航天遥感
random vibration
space mirror
transverse residual force
surface degradation
space remote sensing
