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Proceedings Paper

Study of tilt axis bearing arrangement for M3S of TMT project
Author(s): Hongchao Zhao; Jingxu Zhang; Fei Yang; Qichang An; Yanqin Su; Peng Guo
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Paper Abstract

The tertiary mirror positioned assembly (M3PA) of the thirty meters telescope (TMT) is the largest tertiary mirror pointing system in the world. The tracking and pointing performance of M3PA is better than any other telescopes which have been built, and the working condition is even worse, so the designers face an enormous challenge. The tracking system includes the bottom rotator shaft and the tilt shaft. The study of this paper focuses on the tilt shaft. There are mainly three forms. The first form is one end fixed with the other unrestrained in axial direction. The second form uses two pairs of angular contact ball bearing. The last form lays two tape roller bearings. All of them can meet the requirements when the M3PA is vertical. But the first one becomes invalid when the M3PA is horizontal. We pay our attention on the study for the second arrangement method.. This bearing arrangement can produce a good stiffness, and increase the first modal frequency to 15.1Hz. In addition, some analysis were down to study the load applied on the balls. The results show that the maximum load is up to 5000N with the stress of 2300MPa.

Paper Details

Date Published: 2 September 2014
PDF: 6 pages
Proc. SPIE 9280, 7th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 92800M (2 September 2014); doi: 10.1117/12.2068924
Show Author Affiliations
Hongchao Zhao, Changchun Institute of Optics, Fine Mechanics and Physics (China)
Univ. of Chinese Academy of Sciences (China)
Jingxu Zhang, Changchun Institute of Optics, Fine Mechanics and Physics (China)
Fei Yang, Changchun Institute of Optics, Fine Mechanics and Physics (China)
Qichang An, Changchun Institute of Optics, Fine Mechanics and Physics (China)
Yanqin Su, Changchun Institute of Optics, Fine Mechanics and Physics (China)
Univ. of Chinese Academy of Sciences (China)
Peng Guo, Changchun Institute of Optics, Fine Mechanics and Physics (China)


Published in SPIE Proceedings Vol. 9280:
7th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes
Wenhan Jiang; Myung K. Cho; Fan Wu, Editor(s)

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