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Proceedings Paper

Finite element analysis of the GTC Commissioning Instrument structure
Author(s): Alejandro Farah; Javier Godoy; F. Velazquez; Carlos Espejo; Salvador Cuevas; Vicente Bringas; A. Manzo; L. del Llano; J. L. Sanchez; Armando Chavoya; Nicholas Devaney; Javier Castro; Luis Cavaller
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Paper Abstract

Under a contract with the GRANTECAN, the Commissioning Instrument (CI) is a project developed by a team of Mexican scientists and engineers from the Instrumentation Department of the Astronomy Institute at the UNAM and the CIDESI Engineering Center. The CI will verify the Gran Telescopio Canarias (GTC) performance during the commissioning phase between First Light and Day One. The design phase is now completed and the project is currently in the manufacturing phase. The CI main goal is to measure the telescope image quality. To obtain a stable high resolution image, the mechanical structures should be as rigid as possible. This paper describes the several steps of the conceptual design and the Finite Element Analysis (FEA) for the CI mechanical structures. A variety of models were proposed. The FEA was useful to evaluate the displacements, shape modes, weight, and thermal expansions of each model. A set of indicators were compared with decision matrixes. The best performance models were subjected to a re-optimization stage. By applying the same decision method, a CI Structure Model was proposed. The FEA results complied with all the instruments specifications. Displacements values and vibration frequencies are reported.

Paper Details

Date Published: 4 February 2003
PDF: 8 pages
Proc. SPIE 4837, Large Ground-based Telescopes, (4 February 2003); doi: 10.1117/12.457979
Show Author Affiliations
Alejandro Farah, Instituto de Astronomia/Univ. Nacional Autonoma de Mexico (Mexico)
Javier Godoy, Instituto de Astronomia/Univ. Nacional Autonoma de Mexico (Mexico)
F. Velazquez, Instituto de Astronomia/Univ. Nacional Autonoma de Mexico (Mexico)
Carlos Espejo, Instituto de Astronomia/Univ. Nacional Autonoma de Mexico (Mexico)
Salvador Cuevas, Instituto de Astronomia/Univ. Nacional Autonoma de Mexico (Mexico)
Vicente Bringas, Ctr. de Ingenieria y Desarrollo Industrial (Mexico)
A. Manzo, Ctr. de Ingenieria y Desarrollo Industrial (Mexico)
L. del Llano, Ctr. de Ingenieria y Desarrollo Industrial (Mexico)
J. L. Sanchez, Ctr. de Ingenieria y Desarrollo Industrial (Mexico)
Armando Chavoya, Ctr. de Ingenieria y Desarrollo Industrial (Mexico)
Nicholas Devaney, Instituto de Astrofisica de Canarias (Spain)
Javier Castro, Instituto de Astrofisica de Canarias (Spain)
Luis Cavaller, Instituto de Astrofisica de Canarias (Spain)


Published in SPIE Proceedings Vol. 4837:
Large Ground-based Telescopes
Jacobus M. Oschmann; Larry M. Stepp, Editor(s)

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