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Comparative Study of Vibration Condition Indicators for Detecting Cracks in Spur Gears
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Author and Affiliation:
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)
Abstract: This 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.
Publication Date: May 21, 2013
Document ID:
20130014045
(Acquired Jul 24, 2013)
Subject Category: METALS AND METALLIC MATERIALS
Report/Patent Number: GRC-E-DAA-TN8754
Document Type: Conference Paper
Meeting Information: American Helicopter Society (AHS) 69th Anual Forum; 21-23 May 2013; Phoenix, AZ; United States
Meeting Sponsor: American Helicopter Society, Inc.; New York, NY, United States
Contract/Grant/Task Num: WBS 380046.02.03.02.02.02
Financial Sponsor: NASA Glenn Research Center; Cleveland, OH, United States
Organization Source: Rochester Inst. of Tech.; Rochester, NY, United States
Description: 9p; In English; Original contains color illustrations
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright; Distribution as joint owner in the copyright
NASA Terms: CRACK PROPAGATION; CRACKS; DAMAGE; DETECTION; FAILURE MODES; GEARS; LOADS (FORCES); MACHINING; VIBRATION; WEAR
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