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Proceedings Paper

Thermal analysis of the TMT telescope structure
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Paper Abstract

Thermal performances of the Thirty Meter Telescope (TMT) structure were evaluated by finite element thermal models. The thermal models consist of the telescope optical assembly systems, instruments, laser facility, control and electronic equipments, and structural members. Temporal and spatial temperature distributions of the optical assembly systems and the telescope structure were calculated under various thermal conditions including air convections, conductions, heat flux loadings, and radiations. In order to capture thermal responses faithfully, a three-consecutive-day thermal environment data was implemented. This thermal boundary condition was created by CFD based on the environment conditions of the corresponding TMT site. The thermo-elastic analysis was made to predict thermal deformations of the telescope structure at every hour for three days. The line of sight calculation was made using the thermally induced structural deformations. Merit function was utilized to calculate the OPD maps after repositioning the optics based on a best fit of M1 segment deformations. The goal of this thermal analysis is to establish creditable thermal models by finite element analysis to simulate the thermal effects with the TMT site environment data. These thermal models can be utilized for estimating the thermal responses of the TMT structure. Thermal performance prediction of the TMT structure will guide us to assess the thermal impacts, and enables us to establish a thermal control strategy and requirements in order to minimize the thermal effects on the telescope structure due to heat dissipation from the telescope mounted equipment and systems.

Paper Details

Date Published: 4 August 2010
PDF: 12 pages
Proc. SPIE 7738, Modeling, Systems Engineering, and Project Management for Astronomy IV, 77380C (4 August 2010); doi: 10.1117/12.857265
Show Author Affiliations
Myung Cho, GSMT Program Office, National Optical Astronomy Observatory (United States)
Andrew Corredor, The Univ. of Arizona (United States)
Konstantinos Vogiatzis, Thirty Meter Telescope (United States)
George Angeli, Thirty Meter Telescope (United States)

Published in SPIE Proceedings Vol. 7738:
Modeling, Systems Engineering, and Project Management for Astronomy IV
George Z. Angeli; Philippe Dierickx, Editor(s)

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