Research on positioning mechanism of optical device based on on-orbit replacement

Qing-ya LI; Wei-guo ZHAO; Zhen SHI; Yan WANG; Li-bao YANG

doi:10.3788/OPE.20192710.2233

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Research on positioning mechanism of optical device based on on-orbit replacement

Micro/Nano Technology and Fine Mechanics | 更新时间：2020-08-13

- Research on positioning mechanism of optical device based on on-orbit replacement
- Optics and Precision Engineering Vol. 27, Issue 10, Pages: 2233-2240(2019)
- 作者机构：
  
  1.中国科学院长春光学精密机械与物理研究所, 吉林长春130033
  2.中国科学院大学, 北京 100039
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20192710.2233
  CLC： V476
- Received：13 March 2019，
  
  Accepted：15 April 2019，
  
  Published：15 October 2019
- 稿件说明：
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Qing-ya LI, Wei-guo ZHAO, Zhen SHI, et al. Research on positioning mechanism of optical device based on on-orbit replacement[J]. Optics and precision engineering, 2019, 27(10): 2233-2240.
DOI：

Qing-ya LI, Wei-guo ZHAO, Zhen SHI, et al. Research on positioning mechanism of optical device based on on-orbit replacement[J]. Optics and precision engineering, 2019, 27(10): 2233-2240. DOI： 10.3788/OPE.20192710.2233.

摘要

为了实现空间望远镜大型光学载荷的在轨更换，设计了一种能够实现在轨快速拆装的定位机构，并针对其核心问题即在轨重复定位精度进行了研究。首先，选定了一种能够避免热应力的运动学定位方式。在此基础上设计了定位机构，并根据刚体的微小角位移是矢量并符合矢量合成法则的原则，利用角位移矢量合成的方法推导出了光学载荷的转角数学模型；然后，设计杆系结构模拟了光学载荷及其框架，同时为了模拟光学载荷在轨拆装的微重力环境，利用微重力模拟的常用方法悬吊法设计了悬吊装置，以实现光学载荷模块的重力卸载；最后，搭建了试验检测环境，对光学载荷模块进行重复拆装试验，利用经纬仪及数显千分表进行检测，并处理试验结果得到了重复定位误差值。结果表明，光学载荷模块的重复安装转角误差最大为±28.8″，平移误差最大为±0.057 mm。本文研究能够为在轨可更换载荷定位机构的设计提供参考，具有理论意义和应用价值。

Abstract

A kind of positioning mechanism that ensured large optical device could be replaced quickly was designed in order to realize the on-orbit replacement of a large optical device

and the accuracy of the re-orientation of the device was studied as the key issue of on-orbit replacement. Firstly

a kinematic positioning method that can prevent thermal stress was studied. On the basis of this method

the positioning mechanism was designed. And according to the principle that the microrotation angles of the rigid body are vectors and meets the vector synthesis rule

the mathematical model of the rotation angle of the optical device was derived by the method of synthesizing angular displacement vectors. Then

the beam structure simulating the optical device and frame was designed

simultaneously suspending device was designed based on the common sling suspension method of unloading gravity to imitate the replacement of the device on-orbit in microgravity. Finally

the experimental environment was set up

and the optical device module was repeatedly inserted and taken out of the frame to measure the re-orientation accuracy by theodolites and digital micrometers. The results show that the maximum repeated installation rotational error of the optical device module is ±28.8″ while the maximum translation error is ±0.057 mm. This study provides reference for the design of the positioning mechanism of an on-orbit replaceable device

and has theoretical significance and application value.

关键词

Keywords

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