卫星激光测距中主镜柔性支撑结构设计及分析.pdf

第27卷第8期
电子测量与仪器学报
Vot. 27 N
69
JOURNAL OF ELECTRONIC MEASUREMENT AND INSTRUMENT
2013年8月
DI:10.3724/SP.J.187.2013.00696
卫星激光测距中主镜柔性支撑结构设计及分析
薛向尧高云国
(中国科学院长春光学精密械与物理研究所长春130033)
摘要:为了降低卫星激光测距中主镜在大温差环境下的面形误差,设计了一种主镜柔性支撑结构,针对柔性饺链结枘形
式,推导了单边圆弧形柔的转角柔度方程,确定了影响柔饺支撑刚度和柔度最敏感的两个参数为柔性铰链的宽度和最薄
处厚度,采用有限元法对主镜支撑结构进行了仿真分析,确定了柔性铰链的宽度最薄处厚度,使主镜在0℃温差环境下具
有良好的热尺寸稳定性,结构刚度在工作状态下满足使用要求。在力热耦合状态下,分析结果表明,主镜综合面形误差
RMS小于20m,主镜刚体位移则控制在6pm以下,并通过主镜面形检测試验进一步验证了彷真分析的正确性。由此,在
大温差环境下该柔性支撑结构俽到了刚柔兼庼
关键词:激光测距;主镜;柔性支撑;有限元分析
中图分类号:TH703;V55.5文献标识码:A国琼标准学科分类代码:120.4640
Design and analysis of a flexible support structure for the primary mirror of SLR
Xue Xiangyao Gao Yunguo
Changchun Institute of Optic, Fine Mechanics and Physics, Chinese Academy of Science, Changchun 130033, China)
Abstract To reduce the surface deformation of the primary mirror in a satellite laser ranging, a flexible support
structure is designed. Based on the structure of the flexure hinge, a compliance formulation of the half right circular
flexure hinge is formulated, therefore, the width 'b 'and thickness 't' of the flexure hinge, which are two of the
most sensitive parameters, are picked out. Then, he fexible support structure is analyzed with finite element meth-
od by which the value of b' and 1 'are determined. The simulation results show that RMS and displacement val
ues of the primary mirror is less than 20 nm and 6 um, respectively, under the load case of gravity in z direction
coupled with uniform temperature drop 60C, which is validated by measured values of pri
shape. Finally, the balance between rigid and flexible of the flexible support structure is found under great variation
ature
Keywords: laser ranging; primary mirror; flexible support; finite element analysis
技术的文献报道较为少见。这是因为航空航天领
1引
域的光电设备大多有环境温度控制技术作为保
主反射镜作为卫星激光浏距系统的关键部件,障,工作环境温差一般控制在士5℃以内,因此主
决定着发射激光的光束质量,进而影响整个系统的镜柔性支撑技术可以保证支撑刚度的同时具有
探测距离和测距精度,主反射镜的支撑在对反射镜定的柔度,以减小热应力对反射镜面形的影
进行有效定位的同时,需要减小自重及热应力对反响“。地面光电设备大多裸露在外场工作
射镜面形的影响?。
作环境温差最大可达到60℃,在大温差工况下要
目前,主镜柔性支撑技术在航空航天领域已兼顾主镜柔性支撑结构的刚度和柔度将是一项非
经较为成熟,而有关地面光电测控设备中采用该常艰巨的任务。
收稿日期:2013-04 Received Date:2013-04
基金项目:中国科学院长春光学精密机械与物理研究所三期创新工程资助项目(061X20060
万方数据