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Systems Engineering and Software Specialists ABACUS   AI   PROJECTS   PRESENTATION Abacus has applied AI techniques to many real-world problems.
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FICX

The Abacus FMEA-IMRL Correlation Expert System (FICX) was developed as an aid to fault diagnosis for the Space Shuttle Main Engines (SSME).  The expert system uses two databases developed by SSME engineers: (1) an extensive Failure Mode Effect Analysis (FMEA) database and (2) the Instrumented Measurements Requirements List (IMRL).  The FMEA describes potential failures, their causes, and their effects.  The IMRL contains the identification and measurement types of the performance monitoring sensors attached to the engine on its test stand.  Based on the belief that any serious SSME failure would eventually manifest itself through some sensor measurement, the problem addressed by FICX is to correlate any selected FMEA entry with the set of IMRL measurements which would indicate the failure.  The significance of this correlation lies in its potential as a core strategy for automatic SSME fault diagnosis/prognosis.  Because of the way these two databases have been constructed (much of the data is in the form of relatively unrestrained English), and because the two databases were developed entirely independent of each other, the process of correlating the two requires the use of an heuristic strategy based on actual knowledge about the SSME rather than simple search techniques.  FICX was developed to perform this complex correlation task.



Space Shuttle Main Engine Expert Fault Analysis
The Abacus FMEA-IMRL Correlation Expert System was developed as an aid to fault diagnosis for the Space Shuttle Main Engines.
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