轻型空间相机桁架结构设计与模态分析

为设计适合轻型高分辨空间相机的桁架结构,研究了模态分析的方法和桁架设计中需要考虑的问题.通过对不同的次镜支撑结构进行模态分析和对比,提出了适用于轻型相机的三翼中心三角次镜支撑结构,并完成了整体桁架结构的设计.有限元分析结果表明,所设计的桁架结构具有固有频率高、质量轻等优点,能够满足轻型空间相机的要求,并可以作为其他大口径空间相机桁架结构的设计参考. 

Structure Design and Modes Analysis for the Truss of Light High Resolution Space Camera

To design the light precision truss,which is fitted to characteristic of the light high resolution space camera,the method of mode analysis and the principles of designing the main truss are studied.The natural frequency and the first two vibration modes of different types supporting structure for the second mirror are analyzed using FEA software UG and Nastran.Then,a three vanes with triangular hub structure for supporting secondary mirror is proposed,and the design of the main truss is done.The analysis results indicate that the truss design has a higher resonance frequency and a light mass.So it can be applied to the light high resolution space telescope and it can also be a special reference to the design of other large aperture space telescope.