Design and tests of shafting structure in giant steerable science mirror prototype system

ZHAO Hong-chao; JIANG Hai-bo; AN Qi-chang; GUO Peng; YANG Fei

doi:10.3788/OPE.20172513.0113

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Design and tests of shafting structure in giant steerable science mirror prototype system

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- Design and tests of shafting structure in giant steerable science mirror prototype system
- Optics and Precision Engineering Vol. 25, Issue 10s, Pages: 113-119(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.20172513.0113
  CLC： TH751
- Received：17 May 2017，
  
  Revised：12 June 2017，
  
  Published：25 November 2017
- 稿件说明：
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赵宏超, 姜海波, 安其昌等. TMT三镜原理演示系统轴系结构设计及精度测试[J]. 光学精密工程, 2017,25(10s): 113-119

ZHAO Hong-chao, JIANG Hai-bo, AN Qi-chang etc. Design and tests of shafting structure in giant steerable science mirror prototype system[J]. Editorial Office of Optics and Precision Engineering, 2017,25(10s): 113-119
赵宏超, 姜海波, 安其昌等. TMT三镜原理演示系统轴系结构设计及精度测试[J]. 光学精密工程, 2017,25(10s): 113-119 DOI： 10.3788/OPE.20172513.0113.

ZHAO Hong-chao, JIANG Hai-bo, AN Qi-chang etc. Design and tests of shafting structure in giant steerable science mirror prototype system[J]. Editorial Office of Optics and Precision Engineering, 2017,25(10s): 113-119 DOI： 10.3788/OPE.20172513.0113.

摘要

为验证三十米望远镜项目（TMT）三镜系统的轴系跟踪系统设计，设计、加工制造了一个比例为1/4的原理演示系统。对影响该系统回转精度、重复性指向精度的误差来源进行研究。首先，设计了一套方位轴系和俯仰轴系均采用双排角接触预紧球轴承作为支撑的回转系统，以满足三镜系统复杂工况的需要。然后，建立了该系统的有限元模型，以预测原理演示系统的性能。最后，测量了两个垂直轴的晃动误差以及在两个工况下系统的重复性指向误差。仿真结果表明，系统的第一阶谐振频率可达35.9 Hz，能够满足前期设计要求；实验验证中，采用傅里叶谐波理论处理后得到俯仰轴系的晃动误差约为1.91"（PV），方位轴晃动误差约为2.5"（PV）。后期的重复性指向实验显示，三镜原理演示系统的重复性指向精度约为2.77"（RMS）。仿真和实验结果证明三镜系统轴系的设计方案合理，测试方法可行，能够达到预期效果。

Abstract

To develop a smooth tracking mechanism for Thirty Meter Telescope (TMT) in the gravity-invariant condition

a 1/4 scale

functionally accurate version of the Giant Steerable Science Mirror (GSSM) prototype was developed for pre-construction. The error sources influencing the rotation and pointing accuracies of the system were investigated. Due to complicated working conditions

a shafting system for the GSSM was designed with angular contact ball bearings as support of the azimuth-altitude system. Then

a detailed finite element model was constructed to verify the performance of this system. Wobble tests were performed. In addition

a repeatability test was designed and carried out to verify the pointing accuracy of the system. The first modal frequency is approximately 35.9 Hz

which meets the design requirement well. Moreover

the wobble error of the altitude axis is approximately 1.91"(PV)

while the one for azimuth axis is approximately 2.5"(PV). The repeatability of the GSSM is up to 2.77"(RMS) by the test data. The results indicate that the proposed shafting system is feasible and can achieve the requirements of the TMT.

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references

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