空间相机支杆组件的随机振动分析与试验研究

Research on Analysis and Test of Random Vibration on Tripodic Supporting Structure of Space Camera

根据结构件随机振动的原理,利用MSC.NASTRAN有限元分析软件,对某空间相机碳化硅支杆组件进行了模态分析、随机激励下的加速度响应和峰值应力响应分析。研究了峰值等效原理在随机振动峰值应力预测上的应用,并进行了相关的地面振动试验。依据试验获得结构阻尼,修正有限元模型。将分析与试验数据进行了对比,结果表明该工程分析方法和技术途径是合理可行的。

According to the theory of random vibration analysis on structure components, the modal analysis, acceleration response and peak value of stress response prediction for random vibration on a tripodic supporting structure of a space camera were conducted with MSC.NASTRAN finite element software. The peak value of stress response on random vibration was studied based on the peak value equivalent theory. The relative vibration test was done in the lab condition. Damp of the structure was obtained using the date of test, and the finite element model was corrected. The analysis and test results show that the method and technical route mentioned on response prediction for random vibration is reasonable and feasible.