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首页> 美国政府科技报告 >THERMAL VACUUM LIFE TEST OF AN MSDS SOLAR ARRAY DRIVE (MSDS NO 2) (FIRST 2 YEARS OF OPERATION)
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THERMAL VACUUM LIFE TEST OF AN MSDS SOLAR ARRAY DRIVE (MSDS NO 2) (FIRST 2 YEARS OF OPERATION)

机译：msDs太阳能驱动器的热真空寿命测试（msDs NO 2）（第一个2年的操作）

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The second of the solar paddle drive mechanisms manufactured by Marconi Space and Defence Systems, under the ESTEC supporting technology programme, is undergoing a thermal vacuum life test at ESTL, the shaft being rotated at its normal speed of one revolution a day. An initial Acceptance test was carried out in June 1974 and the Life Test was commenced in July 1975.a During the test a radiator surrounding the mechanism in the vacuum chamber has been held at a constant temperature of 22.5°C, while the shaft temperature, measured at the top of the shaft inboard of the large shaft bearing, is changed at six monthly intervals so that it operates at either 10°C or 60°C. At the beginning of each six monthly cycle, thirty "eclipse" temperature cycles are carried out in which the shaft temperature is reduced from 60°C to 0°C in 72 minutes and returned to 60°C.

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