Parallel adjustment mechanism for large aperture telescope based on flexible hinges

被引：0
|
作者：
Yu Y. [1 ]
Wang X. [1 ,2 ]
Xu Z. [1 ,2 ]
Han C. [1 ]
Cao Y. [1 ]
Wang J. [1 ,2 ]
机构：
[1] Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun
[2] University of Chinese Academy of Sciences, Beijing
来源：
Guangxue Jingmi Gongcheng/Optics and Precision Engineering | 2023年 / 31卷 / 03期
关键词：
ground based telescope; high lateral stiffness; parallel mechanism; rigid flexible coupling; submicron accuracy;
D O I：
10.37188/OPE.20233103.0352
中图分类号：
学科分类号：
摘要：
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. © 2023 Chinese Academy of Sciences. All rights reserved.
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页码：352 / 362
页数：10
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