NASA-LLIS-0966
Lessons Learned – Space Shuttle Main Engine (SSME): Fuel System Oscillations
active, Most Current
| Organization: | NASA |
| Publication Date: | 15 May 1995 |
| Status: | active |
| Page Count: | 2 |
scope:
Description of Driving Event:
After the main fuel valve starts to open, three oxidizer valves in the SSME are separately subjected to a series of position commands to precisely control oxidizer system priming times for the three combustors. The first oxidizer valve to be commanded is the fuel preburner oxidizer valve (FPOV). After a delay of 0.100 seconds, the FPOV is ramped to 56 percent open at its maximum skew rate. At 0.72 seconds, the FPOV is given a "notch" command to close about 10%. Just prior to the third fuel system oscillation, second "notch" command is given.
Document History
NASA-LLIS-0966
May 15, 1995
Lessons Learned – Space Shuttle Main Engine (SSME): Fuel System Oscillations
Description of Driving Event:
After the main fuel valve starts to open, three oxidizer valves in the SSME are separately subjected to a series of position commands to precisely control oxidizer...
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