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Analysis of Transmission Failure Modes
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English
Abstract
This paper presents a synopsis of an extensive failure mode investigation and analysis of Bell UH-1 and Vertol CH-47 transmissions. Correlation of these observed field experiences with conventional design stress analysis techniques and preliminary bench test data is presented. Lubrication states as defined by elastohydrodynamic film thickness calculations are shown to offer explanation for the existence of many failure modes which are not predicted by conventional analyses. Simple statistical methods for failure data analysis are employed as an aid to assessing relative gain in reliability afforded through correction of dominant failure modes. The premise is advanced that the key to successful design of advanced helicopter power transmissions featuring significant increases in operational reliability may be found in the application of these lessons.
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Authors
Citation
Bowen, C., "Analysis of Transmission Failure Modes," SAE Technical Paper 710454, 1971, https://doi.org/10.4271/710454.Also In
References
- Bowen C. W. Dyson L. L. Walker R. D. “Mode of Failure Investigations of Helicopter Transmissions.” U. S. Army Air Mobility Research and Development Laboratory Fort Eustis, Va. USAAVLABS Technical Report 70-66 Jan. 1971
- Burroughs L. R. “Study of Helicopter Transmission System Development Testing Final Report.” Sikorsky Aircraft - AVSCOM Oct. 1968
- Graham G. L. “Combat Operational Flight Profiles on the UH-1C, AH-1G, and UH-1H Helicopters.” 26th Annual National Forum of the AHS Washington, D. C. June 1970
- Chiu Y. P. McCool J. I. “Calculation of Minimum Lubricant Film Thickness in Rolling Bearings.” SKF Research Laboratory Report No. AL64L006 1964
- Christensen H. “Nature of Metallic Contact in Mixed Lubrication.” Institution of Mechanical Engineers Symposium in Leeds, Paper 12 Sept. 1965
- Dyson A. Naylor H. Wilson A. R. “The Measurement of Oil Film Thickness in Elastohydrodynamic Contacts.” Institution of Mechanical Engineers Symposium in Leeds, Paper 10 Sept. 1965
- Dowson D. Higginson G. R. Whitaker A. V. “Stress Distribution in Lubricated Rolling Contacts.” J. of Mechanical Engineering Sciences 1962 4 121
- Braddock C. E. Hopfensperger L. J. “Designing Planetary Gears to Operate With Low Viscosity Synthetic Lubricants.” Paper 680212 presented at SAE Business Aircraft Meeting Wichita April 1968