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A novel hexapod and its prototype for secondary mirror alignment in telescopes
Yang, De-Hua1; Cheng, Ying1; Wu, Chang-Cheng1; Fei, Fei1; Jin ZY(金振宇)2
Source PublicationRESEARCH IN ASTRONOMY AND ASTROPHYSICS
2018-08-01
Volume18Issue:9Pages:10
DOI10.1088/1674-4527/18/9/115
Contribution Rank第2完成单位
Indexed BySCI
Keywordtelescopes methods: analytical methods: miscellaneous techniques: miscellaneous
Abstract

This paper presents a novel hexapod as the adjustment mechanism for a telescope to actively align its secondary mirror. The special hexapod provides six degrees of freedom (6-DOFs) with decoupled translation and rotation. The decoupled kinematic motions are analyzed and commented on as the alignment mechanism of a secondary mirror from an optical alignment point of view. In terms of performance of the adjustment generally required by the secondary mirror in a telescope, we developed a prototype that uses a novel hexapod design with linear micro-displacement actuators. Especially, in order to achieve high precision, flexures were used to build joints for the hexapod to minimize frictions and eliminate backlashes. Based on the specific configuration and dimension of the prototype hexapod, an analytical model of the reachable workspace was built with the constraints defined by limited rotation angles of the flexure-based joints. We used a laser tracker to verify that the hexapod can reach a spherical translation workspace of phi 6 mm and a rotation workspace of +/- 1 degrees. The translational repeatability was tested to be around half a mu m by laser displacement sensors. In addition, we also measured the axial and lateral stiffnesses of the hexapod to be around 5500 N mm(-1) and 1750 N mm(-1), respectively. The kinematic analyses and convincing test results jointly encourage implementing the novel hexapod design with decoupled translation and rotation as a favorable alignment mechanism for secondary mirrors in astronomical telescopes.

Funding ProjectNational Natural Science Foundation of China[U1531110]
Funding OrganizationNational Natural Science Foundation of China[U1531110]
Language英语
Subject Area天文学
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherNATL ASTRONOMICAL OBSERVATORIES, CHIN ACAD SCIENCES
Publication PlaceCHIN ACAD SCIENCES, 20A DATUN RD, CHAOYANG, BEIJING, 100012, PEOPLES R CHINA
ISSN1674-4527
URL查看原文
WOS IDWOS:000445688500011
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
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Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/17923
Collection抚仙湖太阳观测站
Corresponding AuthorYang, De-Hua
Affiliation1.College of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China
2.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650011, China
Recommended Citation
GB/T 7714
Yang, De-Hua,Cheng, Ying,Wu, Chang-Cheng,et al. A novel hexapod and its prototype for secondary mirror alignment in telescopes[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2018,18(9):10.
APA Yang, De-Hua,Cheng, Ying,Wu, Chang-Cheng,Fei, Fei,&Jin ZY.(2018).A novel hexapod and its prototype for secondary mirror alignment in telescopes.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,18(9),10.
MLA Yang, De-Hua,et al."A novel hexapod and its prototype for secondary mirror alignment in telescopes".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 18.9(2018):10.
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