Contextual Normalization Applied to Aircraft Gas Turbine Engine Diagnosis

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Journal titleJournal of Applied Intelligence
Subjectmachine learning; engine diagnosis; machinery condition monitoring; normalization; robust classification; diagnostic de moteur; contrôle d'état de machines; normalisation; classification robuste
AbstractDiagnosing faults in aircraft gas turbine engines is a complex problem. It involve sseveraltasks, including rapid and accurate interpretation of patterns in engine sensor data.We have investigated contextual normalization for the development of a software tool to help engine repair technicians with interpretation of sensor data. Contextual normalization is a new strategy for employing machine learning. It handles variation in data that is due to contextual factors, rather than the health of the engine. It does this by normalizing the data in a context-sensitive manner.This learning strategy was developed and tested using 242 observations of an aircraft gas turbine engine in a test cell, where each observation consists of roughly 12,000 numbers,gathered over a 12 second interval. There were eight classes of observations: seven deliberately implanted classes of faults and a healthy class. We compared two approaches to implementing ourlearning strategy: linear regression and instance-based learning. We have three main results.(1) For the given problem, instance-based learning works better than linear regression. (2) For this problem, contextual normalization works better than other common forms of normalization. (3) The algorithms described here can be the basis for a useful software tool for assisting technicians with the interpretation of sensor data.
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AffiliationNRC Institute for Information Technology; National Research Council Canada
Peer reviewedNo
NRC number35028
NPARC number5764847
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Record identifierc40b3fe8-88e4-4436-8b21-bd17d4d07425
Record created2009-03-29
Record modified2016-05-09
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