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Framework for a space shuttle main engine health monitoring systemA framework developed for a health management system (HMS) which is directed at improving the safety of operation of the Space Shuttle Main Engine (SSME) is summarized. An emphasis was placed on near term technology through requirements to use existing SSME instrumentation and to demonstrate the HMS during SSME ground tests within five years. The HMS framework was developed through an analysis of SSME failure modes, fault detection algorithms, sensor technologies, and hardware architectures. A key feature of the HMS framework design is that a clear path from the ground test system to a flight HMS was maintained. Fault detection techniques based on time series, nonlinear regression, and clustering algorithms were developed and demonstrated on data from SSME ground test failures. The fault detection algorithms exhibited 100 percent detection of faults, had an extremely low false alarm rate, and were robust to sensor loss. These algorithms were incorporated into a hierarchical decision making strategy for overall assessment of SSME health. A preliminary design for a hardware architecture capable of supporting real time operation of the HMS functions was developed. Utilizing modular, commercial off-the-shelf components produced a reliable low cost design with the flexibility to incorporate advances in algorithm and sensor technology as they become available.
Document ID
19900012493
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Hawman, Michael W. (United Technologies Research Center East Hartford, CT., United States)
Galinaitis, William S. (United Technologies Research Center East Hartford, CT., United States)
Tulpule, Sharayu (United Technologies Research Center East Hartford, CT., United States)
Mattedi, Anita K. (United Technologies Research Center East Hartford, CT., United States)
Kamenetz, Jeffrey (United Technologies Corp. Windsor Locks, CT., United States)
Date Acquired
September 6, 2013
Publication Date
May 1, 1990
Subject Category
Spacecraft Propulsion And Power
Report/Patent Number
NAS 1.26:185224
UTRC-R90-997978
NASA-CR-185224
Accession Number
90N21809
Funding Number(s)
PROJECT: RTOP 553-13-00
CONTRACT_GRANT: NAS3-25626
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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