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RESEARCH PAPERS: Power Transmissions and Gearing Papers

An Analytical Method to Predict Efficiency of Aircraft Gearboxes

[+] Author and Article Information
N. E. Anderson

Propulsion Laboratory, AVSCOM Research and Technology Laboratories, Lewis Research Center, Cleveland, Ohio

S. H. Loewenthal

National Aeronautics and Space Administration, Lewis Research Center, Cleveland, Ohio

J. D. Black

Allison Gas Turbine Division, Indianapolis, IN

J. Mech., Trans., and Automation 108(3), 424-432 (Sep 01, 1986) (9 pages) doi:10.1115/1.3258750 History: Received November 08, 1985; Online November 19, 2009

Abstract

A spur gear efficiency prediction method previously developed by the authors was extended to include power loss of planetary gearsets. A friction coefficient model was developed for MIL-L-7808 oill based on disk machine data. This, combined with the recent capability of predicting losses in spur gears of nonstandard proportions, allows the calculation of power loss for complete aircraft gearboxes that utilize spur gears. The method was applied to the T56/501 turboprop gearbox and compared with measured test data. Bearing losses were calculated with large-scale computer programs. Breakdowns of the gearbox losses point out areas for possible improvement.

Copyright © 1986 by ASME
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