Parallel adjustment mechanism for large aperture telescope based on flexible hinges

YU Yang; WANG Xuewen; XU Zhenbang; HAN Chunyang; CAO Yuyan; WANG Jianli

doi:10.37188/OPE.20233103.0352

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Parallel adjustment mechanism for large aperture telescope based on flexible hinges

Micro/Nano Technology and Fine Mechanics | 更新时间：2023-02-15

- Parallel adjustment mechanism for large aperture telescope based on flexible hinges
- Optics and Precision Engineering Vol. 31, Issue 3, Pages: 352-362(2023)
- 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 100049
- 作者简介：
- 基金信息：
- DOI：10.37188/OPE.20233103.0352
  CLC： TH132
- Received：20 August 2022，
  
  Revised：28 September 2022，
  
  Published：10 February 2023
- 稿件说明：
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于阳,王学问,徐振邦等.基于柔性铰链的大口径望远镜并联调整机构[J].光学精密工程,2023,31(03):352-362.

YU Yang,WANG Xuewen,XU Zhenbang,et al.Parallel adjustment mechanism for large aperture telescope based on flexible hinges[J].Optics and Precision Engineering,2023,31(03):352-362.
于阳,王学问,徐振邦等.基于柔性铰链的大口径望远镜并联调整机构[J].光学精密工程,2023,31(03):352-362. DOI： 10.37188/OPE.20233103.0352.

YU Yang,WANG Xuewen,XU Zhenbang,et al.Parallel adjustment mechanism for large aperture telescope based on flexible hinges[J].Optics and Precision Engineering,2023,31(03):352-362. DOI： 10.37188/OPE.20233103.0352.

摘要

为减小地基大口径望远镜在光学追踪过程中重力变形对成像质量的影响，设计了一种基于柔性铰链的高侧向刚度、亚微米精度并联调整机构。首先，介绍了系统组成并针对技术指标的要求，开展了两自由度柔性铰链设计。建立了柔性铰链并联机构的等效运动学模型和刚度模型，搭建了并联机构刚柔耦合运动学仿真系统，分析了柔性铰链对机构精度的影响。最后，搭建实验测试系统，来验证柔性铰链的设计合理性和并联调整平台刚柔耦合运动学分析的准确性。仿真和测试结果表明，柔性铰链转动刚度误差控制在3.54%之内，小位移（微米/角秒量级）运动精度达亚微米量级，大位移（毫米/度）运动精度与仿真结果对比误差控制在微米量级，机构侧向刚度优于60 N/μm，能够满足地基望远镜光学成像的要求。

Abstract

To reduce the effects of gravity deformation on the imaging quality of large aperture ground-based telescopes during optical tracking， a parallel adjustment mechanism with high lateral stiffness and submicron accuracy based on flexible hinges is developed. First， a system of parallel mechanism is introduced and a two-degree-of-freedom flexible hinge is designed according to specific technical indicators. Second， equivalent kinematics and stiffness models of the flexible hinge parallel mechanism are developed. Subsequently， a rigid-flexible coupling kinematics simulation system of the parallel mechanism is established， and the effects of the flexible hinge on the accuracy of the mechanism are analyzed. Finally， an experimental test system is built to verify the rationality of the flexible hinge design and the accuracy of the rigid-flexible coupling kinematics analysis of the parallel adjustment platform. Simulation and test results show that the rotational stiffness error of the flexible hinge is controlled to within 3.54%， the motion accuracy of the small displacement （micrometer/angular second） reaches the sub-micrometer level， and the motion accuracy of the large displacement （millimeter/degree） is controlled to within the micrometer level as compared with the simulation results. The lateral stiffness of the mechanism is greater than 60 N/μm and can thus meet the requirements of ground-based telescope optical imaging.

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