Center of gravity testing for giant steerable science mirror

AN Qi-chang; ZHANG Jing-xu; YANG Fei; ZHAO Hong-chao

doi:10.3788/OPE.20172513.0046

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Center of gravity testing for giant steerable science mirror

更新时间：2020-08-13

- Center of gravity testing for giant steerable science mirror
- Optics and Precision Engineering Vol. 25, Issue 10s, Pages: 46-51(2017)
- 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,中国,130033
  2. 中国科学院大学北京,中国,100049
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20172513.0046
  CLC： TH751
- Received：10 May 2017，
  
  Revised：13 June 2017，
  
  Published：25 November 2017
- 稿件说明：
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安其昌, 张景旭, 杨飞等. 巨型科学可控反射镜的质心检测[J]. 光学精密工程, 2017,25(10s): 46-51

AN Qi-chang, ZHANG Jing-xu, YANG fei etc. Center of gravity testing for giant steerable science mirror[J]. Editorial Office of Optics and Precision Engineering, 2017,25(10s): 46-51
安其昌, 张景旭, 杨飞等. 巨型科学可控反射镜的质心检测[J]. 光学精密工程, 2017,25(10s): 46-51 DOI： 10.3788/OPE.20172513.0046.

AN Qi-chang, ZHANG Jing-xu, YANG fei etc. Center of gravity testing for giant steerable science mirror[J]. Editorial Office of Optics and Precision Engineering, 2017,25(10s): 46-51 DOI： 10.3788/OPE.20172513.0046.

摘要

三十米望远镜三镜巨型科学可控反射镜（GSSM）的质量分布对望远镜整体的控制精度影响十分巨大。为实现三十米望远镜整体运动控制，需要在在不倾倒系统的前提下实现质心测量。首先，针对GSSM质心检测方法进行了理论研究，结合激光跟踪仪与力传感器提出了GSSM质心检测方法。为了验证该方法的可行性，对三十米望远镜三镜的四分之一缩比模型（GSSMP）进行了质心检测实验。最后对所测得的结果进行了误差分析。在误差分析中，考虑了由激光跟踪仪所带来的误差与测量仪器所带来的误差，忽略系GSSMP弯沉所带来的误差。根据本文所提出的方法，GSSMP的质量为805.800 kg，其质心位置在三镜坐标系中的坐标为（-7.169 mm，12.900 mm，526 mm）、位置精度为0.501 mm。

Abstract

The tertiary mirror of Thirty Meter Telescope (TMT) is a Giant Steerable Science Mirror (GSSM)

the center of gravity (CG) of which significantly influences the control accuracy of the telescope. However

the GSSM is so large that the traditional lying down method is not suitable for the CG measurement. To measure the CG of the GSSM at small tipping angles

a method for testing the CG with a laser tracker and load cells was proposed and verified theoretically and experimentally. In the experiment

a 1/4 scale prototype of the TMT was constructed and its CG was located. Furthermore

the error of the measuring result was analyzed considering the laser tracker error and equipment error

whereas the gravity sag of GSSMP was ignored. The mass of GSSMP is 805.800 kg

and the location of CG is (-7.169 mm

12.900 mm

526 mm) with an accuracy of 0.501 mm.

关键词

Keywords

references

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