Thermal optimum design for tracking primary mirror of Space Telescope

Hai-jun Pan; Ping Ruan; Fu Li; Hong-Wei Wang

doi:10.1117/12.899606

15 August 2011 Thermal optimum design for tracking primary mirror of Space Telescope

Hai-jun Pan, Ping Ruan, Fu Li, Hong-Wei Wang

Proceedings Volume 8196, International Symposium on Photoelectronic Detection and Imaging 2011: Space Exploration Technologies and Applications; 81960M (2011) https://doi.org/10.1117/12.899606
Event: International Symposium on Photoelectronic Detection and Imaging 2011, 2011, Beijing, China

Abstract

In the conventional method, the structural parameters of primary mirror are usually optimized just by the requirement of mechanical performance. Because the influences of structural parameters on thermal stability are not taken fully into account in this simple method, the lightweight optimum design of primary mirror usually brings the bad thermal stability, especially in the complex environment. In order to obtain better thermal stability, a new method about structure-thermal optimum design of tracking primary mirror is discussed. During the optimum process, both the lightweight ratio and thermal stability will be taken into account. The structure-thermal optimum is introduced into the analysis process and commenced after lightweight design as the secondary optimum. Using the engineering analysis of software ANSYS, a parameter finite element analysis (FEA) model of mirror is built. On the premise of appropriate lightweight ratio, the RMS of structure-thermal deformation of mirror surface and lightweight ratio are assigned to be state variables, and the maximal RMS of temperature gradient load to be object variable. The results show that certain structural parameters of tracking primary mirror have different influences on mechanical performance and thermal stability, even they are opposite. By structure-thermal optimizing, the optimized mirror model discussed in this paper has better thermal stability than the old one under the same thermal loads, which can drastically reduce difficulty in thermal control.

Citation Download Citation

Hai-jun Pan, Ping Ruan, Fu Li, and Hong-Wei Wang "Thermal optimum design for tracking primary mirror of Space Telescope", Proc. SPIE 8196, International Symposium on Photoelectronic Detection and Imaging 2011: Space Exploration Technologies and Applications, 81960M (15 August 2011); https://doi.org/10.1117/12.899606

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KEYWORDS

Mirrors

Space telescopes

Space mirrors

Thermal modeling

Mirror structures

Finite element methods

Optical instrument design

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