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Proceedings Paper

Preliminary structure design and analysis of the Chinese Future Giant Telescope
Author(s): Guoping Li; Dehua Yang
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Paper Abstract

The Chinese Future Giant Telescope (CFGT) has an aperture of 30 m with primary f-ratio of 1.2. Its primary mirror is segmented with 1020 annular submirrors arranged in 17 concentric annuluses. Each segment has average length and width both of 0.8 m. Apart from a conventional Cassegrain focus, four Nasmyth foci on two double-deck platforms on both sides are fundamental in CFGT. Still, there is a Coude focus provided for joining interferometric array. The comparatively small secondary mirror is 2.74 m in diameter, which will serve active corrections. Following optical system requirement, the preliminary structural configuration of CFGT is considered and presented in this paper, including related design schemes of driving systems, bearing systems and mirror support systems. Special consideration on overcoming dead gravitational and random thermal distortion has been taken into the support structure design of both primary and secondary mirrors. In order to evaluate the structural performance of the design, finite element analyses are performed for assemblies and full model of the CFGT.

Paper Details

Date Published: 29 September 2004
PDF: 12 pages
Proc. SPIE 5495, Astronomical Structures and Mechanisms Technology, (29 September 2004); doi: 10.1117/12.551172
Show Author Affiliations
Guoping Li, National Astronomical Observatory/Nanjing Institute of Astronomical Optics and Technology (China)
Dehua Yang, National Astronomical Observatory/Nanjing Institute of Astronomical Optics and Technology (China)

Published in SPIE Proceedings Vol. 5495:
Astronomical Structures and Mechanisms Technology
Joseph Antebi; Dietrich Lemke, Editor(s)

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