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Health Monitoring Survey of Bell 412EP TransmissionsHealth and usage monitoring systems (HUMS) use vibration-based Condition Indicators (CI) to assess the health of helicopter powertrain components. A fault is detected when a CI exceeds its threshold value. The effectiveness of fault detection can be judged on the basis of assessing the condition of actual components from fleet aircraft. The Bell 412 HUMS-equipped helicopter is chosen for such an evaluation. A sample of 20 aircraft included 12 aircraft with confirmed transmission and gearbox faults (detected by CIs) and eight aircraft with no known faults. The associated CI data is classified into "healthy" and "faulted" populations based on actual condition and these populations are compared against their CI thresholds to quantify the probability of false alarm and the probability of missed detection. Receiver Operator Characteristic analysis is used to optimize thresholds. Based on the results of the analysis, shortcomings in the classification method are identified for slow-moving CI trends. Recommendations for improving classification using time-dependent receiver-operator characteristic methods are put forth. Finally, lessons learned regarding OEM-operator communication are presented.
Document ID
20160006439
Acquisition Source
Glenn Research Center
Document Type
Conference Paper
Authors
Tucker, Brian E. (Textron Bell Helicopter Fort Worth, TX, United States)
Dempsey, Paula J. (NASA Glenn Research Center Cleveland, OH United States)
Date Acquired
May 19, 2016
Publication Date
May 17, 2016
Subject Category
Aircraft Design, Testing And Performance
Report/Patent Number
GRC-E-DAA-TN30704
E-19216
Meeting Information
Meeting: American Helicopter Society International''s Annual Forum & Technology Display
Location: West Palm Beach, FL
Country: United States
Start Date: May 17, 2016
End Date: May 19, 2016
Sponsors: American Helicopter Society, Inc.
Funding Number(s)
CONTRACT_GRANT: NNC10BA04B
WBS: WBS 664817.02.03.02.03.02
Distribution Limits
Public
Copyright
Public Use Permitted.
Keywords
mechanical components
helicopter
health

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