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Design of Test Set-ups and Thermal Analysis for Space Simulation Tests with Extreme Temperature Requirements
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Abstract
Various test set-ups are described which illustrate how to obtain very hot and cold temperatures during thermal cycling with the additional requirement that at the extreme temperatures the specimens - in our case white painted antenna dishes- must be visible to perform distortion measurements.
In the cold case the number of thermal leaks or holes in the shroud must be small i.e. the effective shroud temperature shall be as low as possible.
If a solar simulator is used to irradiate the specimen in the hot case, the absorbed energy can be enlarged by using a removable curtain in front of the antenna, which changes the thermo-optical surface properties to higher αs/εH.
In the case of the CASSINI reflector the requirements for the cycle temperature are Tantenna= -160°C and + 150°C. The coating is white paint with αs/εH = 0.2/0.85 and it is not possible to insulate the rear side. More than 3000 Watt/m2 must be absorbed to obtain the high temperature in a space environment.
To fulfil these requirements various test set-ups will be discussed and analysed by thermal calculation. This includes a thermal model for infrared quartz tube heaters. The result is a test set-up with infrared heaters mounted on a shroud with special coating.
Authors
Citation
Frey, H., "Design of Test Set-ups and Thermal Analysis for Space Simulation Tests with Extreme Temperature Requirements," SAE Technical Paper 951677, 1995, https://doi.org/10.4271/951677.Also In
References
- Frey H.U. Holography - a Successful Tool for Distortion Measurements on Antennas under Space Simulation Conditions (ESA SP-304). Proceedings of the Int. Symposium on Environmental Testing ESTEC Noordwjik 1990
- Frey H.U. Distortion Measurements of Antennas under Space Simulation Conditions NASA Conference Publication 2340 Proceedings of the 13th Space Simulation Conference Orlando Octobre 8-11 1984
- Doeneke J. Survey and Evaluation of Multilayer Insulation Heat Transfer Measurements SAE Paper 932117 23 ICES Conference Colorado Springs 12 - 15 Jul. 1993