REG NASA-LLIS-2116-2009 Lessons Learned Mission Operations Planning for Irreversible Processes.pdf
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1、Lessons Learned Entry: 2116Lesson Info:a71 Lesson Number: 2116a71 Lesson Date: 2009-9-30a71 Submitting Organization: GSFCa71 Submitted by: Jerome Koskoa71 POC Name: Jerry Koskoa71 POC Email: jerome.g.koskonasa.gova71 POC Phone: 301-286-5584Subject: Mission Operations Planning for Irreversible Proces
2、ses Abstract: Many spacecraft include mission operations that implement an irreversible process(s) (e.g. pyro technical deployments) which changes the state or configuration of the spacecraft and its operational capability. If not thought out thoroughly some transitions can have undesirable conseque
3、nces. Consequences may arise due to the untimeliness of the transition or unrelated design features.Description of Driving Event: GSFC built an X-Ray Spectrometer (XRS) which was integrated in Japan with 3 other instruments into the Astro E-2 spacecraft and launched it aboard a Japanese rocket from
4、Japan. The XRS was the primary instrument for this mission which was managed by the Japanese Space Agency (JAXA). Astro E-2 was renamed Suzaku once orbit was obtained as is customary for Japanese missions. The XRS uses calorimetric detectors that must be cooled to near absolute zero (operating at 60
5、mK). This was accomplished by a multi stage Dewar which includes liquid He and solid Ne. Dewar operations are initiated on ascent by blowing pyro valves allowing the He and Ne to vent. The Dewar was also equipped with a pyro driven vent that exposes the Dewar guard vacuum to ambient environment. Thi
6、s design feature was intended to vent the guard vacuum to deep space once on orbit. This would allow any cryogen leakage to be effectively prevented from contaminating this volume. There is another pyro gate valve at the telescopes aperture that protects the internal detectors until on orbit. By blo
7、wing the aperture gate valve the instrument becomes fully operational and is enabled to view its entire desired spectrum. Once the XRS was on orbit it was successfully calibrated and configured Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-for full
8、 operations (i.e. guard vacuum and gate valves blown). However, prior to opening either the aperture valve or the valve to the guard vacuum (i.e. He and Ne are venting) significant science can acquired (although only over a small spectrum) in this configuration. Unfortunately, the space craft design
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