Computer Science
Scientific paper
Aug 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004esasp.558..127z&link_type=abstract
Proceedings of the 5th International Symposium on Environmental Testing for Space Programmes Noordwijk, The Netherlands (ESA SP-
Computer Science
Scientific paper
The Thermal Balance (T/B) test of the AMOS-2 spacecraft (S/C) was performed on the flight hardware and took place between 29/5/03 and 2/6/03, six months before its successful launch to space. The test that was performed at the solar vacuum chamber in IABG facility consisted of 6 test cases that covered different S/C operation scenarios and orbital changes. The reasons behind the decision to perform a Solar T/B test are as follow: The thermal design of AMOS-2 S/C is totally different from AMOS1 S/C. High power dissipation density in the S/C. High component density inside the S/C. Severe units temperatures limits. (Mixture of units with different operation temperature limits.) Generally speaking the test - measured temperatures are colder than the predicted temperatures. The S/C units power dissipation during the test is based on calculated assumptions, no actual measurements were performed. The main concern is with the payload power dissipation. There is high uncertainty in regards to the predicted power dissipated in the payload as result of an unqualified RF loads that were used in the test. The best temperatures matching between the measured and the predicted temperatures were achieved during the cold cases, when the S/C had minimum operating TWTA's. It is the opinion of the thermal engineers that worked on the design of the S/C that the actual power dissipated during the test was lower than assumed. During the cold cases the S/C temperatures were always within their lower limits, that fact ensures that the active thermal control of the S/C functioned as designed. The paper describes the thermal design of the S/C, the test layout; the test cases and the test limitations. Finally the results and the conclusions are brought.
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