摘要
针对空间相机反射镜组件在随机振动试验中出现的疲劳破坏问题,为了保证结构的安全,应用有限元方法预测结构随机振动疲劳寿命。首先建立了反射镜组件有限元模型,然后进行了模态和频率响应分析,最后利用MSC.Fatigue软件结合材料S-N曲线和载荷谱进行了随机振动疲劳分析。通过分析得到反射镜组件的疲劳寿命最小为80235s,其位置在柔性支撑结构的十字筋处。结果表明,反射镜组件的疲劳寿命远大于试验的所需时间,满足设计要求,可以对材料的选取和结构的优化设计做出快速响应,为结构随机振动疲劳寿命的研究提供参考和依据。
In accordance with the fatigue failure of mirror component in a random vibration test, to guarantee the safety of structure, a finite element method to predict the fatigue life span of a mirror component is used. First, a finite element model of the mirror component is established. Then, the model and frequency response analysis is made. Final- ly, considering the S-N curve of materials and the load spectrum, the random vibration fatigue life span is analyzed by MSG. Fatigue software. Analytical results indicate that the minimum life span appears at the cross of the flexible support ing structure with 80235s. The life span of mirror component is much larger than the required time, which can fulfill the demand of the design, respond quickly to material selection, structure optimization design, provide reference and basis on the study of the random vibration fatigue.
出处
《光学技术》
CAS
CSCD
北大核心
2013年第6期549-552,共4页
Optical Technique
关键词
反射镜组件
随机振动
疲劳
有限元法
mirror component random vibration fatigue finite element method
