NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Comparative Study of Vibration Condition Indicators for Detecting Cracks in Spur GearsThis paper reports the results of an empirical study on the tooth breakage failure mode in spur gears. Of four dominant gear failure modes (breakage, wear, pitting, and scoring), tooth breakage is the most precipitous and often leads to catastrophic failures. The cracks were initiated using a fatigue tester and a custom-designed single-tooth bending fixture to simulate over-load conditions, instead of traditional notching using wire electrical discharge machining (EDM). The cracks were then propagated on a dynamometer. The ground truth of damage level during crack propagation was monitored with crack-propagation sensors. Ten crack propagations have been performed to compare the existing condition indicators (CIs) with respect to their: ability to detect a crack, ability to assess the damage, and sensitivity to sensor placement. Of more than thirty computed CIs, this paper compares five commonly used: raw RMS, FM0, NA4, raw kurtosis, and NP4. The performance of combined CIs was also investigated, using linear, logistic, and boosted regression trees based feature fusion.
Document ID
20130014045
Acquisition Source
Glenn Research Center
Document Type
Conference Paper
Authors
Nanadic, Nenad
(Rochester Inst. of Tech. Rochester, NY, United States)
Ardis, Paul
(Rochester Inst. of Tech. Rochester, NY, United States)
Hood, Adrian
(Army Research Lab. Aberdeen Proving Ground, MD, United States)
Thurston, Michael
(Rochester Inst. of Tech. Rochester, NY, United States)
Ghoshal, Anindya
(Army Research Lab. Aberdeen Proving Ground, MD, United States)
Lewicki, David
(NASA Glenn Research Center Cleveland, OH, United States)
Date Acquired
August 27, 2013
Publication Date
May 21, 2013
Subject Category
Metals And Metallic Materials
Report/Patent Number
GRC-E-DAA-TN8754
Meeting Information
Meeting: American Helicopter Society (AHS) 69th Anual Forum
Location: Phoenix, AZ
Country: United States
Start Date: May 21, 2013
End Date: May 23, 2013
Sponsors: American Helicopter Society, Inc.
Funding Number(s)
WBS: WBS 380046.02.03.02.02.02
Distribution Limits
Public
Copyright
Public Use Permitted.
No Preview Available