振动疲劳寿命分析在主镜支撑结构设计中的应用

通过随机振动峰值应力响应考核空间相机在随机振动环境下主镜支撑结构的可靠性存在一定的局限性。本文针对主镜支撑结构在随机振动试验中出现断裂的现象，采用振动疲劳寿命分析对结构的可靠性进行考察，提出了应用数值仿真技术预测结构随机振动疲劳寿命的方法。根据有限元和随机振动疲劳相关理论，采用振动疲劳分析软件对某空间相机支撑环柔节进行了随机振动疲劳分析，计算了疲劳寿命的大小及分布。比较仿真和随机振动试验结果表明，采用振动疲劳寿命评价随机振动环境下结构的可靠性是合理的，利用数值仿真技术预测结构的随机振动疲劳寿命是可行的。

Application of vibration fatigue life analysis to design of primary mirror supporting structure

It is not perfect to estimate the reliability of primary mirror supporting structures in space cameras based on the peak value of stress response at a random vibration environment. In accordance with the fracture of supporting structure in a random vibrating test, this paper presents an analysis method of vibration fatigue life to explore the reliability of primary mirror supporting structures, and uses a simulation technology to predict the fatigue lifespan of a supporting structure. Based on the theories of Finite Element Method and random vibration fatigue, the random vibrating fatigue life of the primary mirror supporting structure for a space camera is analyzed by an analysis software. The fatigue lifespan distribution of the whole body and the lifespan values of the most dangerous points are obtained. Experimental results indicate that the simulation results are consistent with the experimental data, which means the proposed method is feasible.