摘要
考核某空间相机主镜组件支撑杆在宽带随机激励下的强度,直接获得支撑杆的峰值应力响应在工程上存在一定困难。为了提高支撑强度,加强星上载荷的安全性,采用有限元软件MSC.PATRAN/NASTRAN进行有限元建模,对主镜组件进行单位加速度载荷下的频率响应仿真,分析获得了正弦振动下结构的峰值应力。利用随机振动和正弦振动之间的峰值等效原理,获得了共振频率点处的随机振动的峰值应力。对支撑杆进行了随机激励下的应力测试试验。比较仿真分析与试验的峰值应力结果,误差在7%以内,说明工程分析方法和技术路线是合理可行的,为进一步展开力学分析和结构优化设计奠定了基础。
The peak value of stress response should be considered when the intensity of the space camera components supporting structure enduring broadband random vibration was investigated, but it is difficult to gt it directly in the engineering. The finite element model and the frequency response analysis of the components enduring the acceleration of unit load were done by MSC. PATRAN/NASTRAN. The peak value of stress enduring the sinusoidal vibration was obtained. Based on the peak value equivalent theory between the random vibration and the sinusoidal vibration, the peak value of stress response on random vibration can be obtained. The stress test was carried out. It is shown that the error value of the peak value of stress response between analysis and test results is less than 7%, the method and technical route mentioned on stress response prediction for random vibration are reasonable and feasible. Some valuable results are proposed to optimize the structural design of the Supporting Structure.
出处
《计算机仿真》
CSCD
北大核心
2010年第5期31-36,共6页
Computer Simulation
关键词
宽带随机振动
峰值应力
峰值等效原理
应力测试试验
Broadband random vibration
Peak value of stress
Peak value equivalent theory
Stress test
