RESEARCH PAPERS: Power Transmissions and Gearing Papers

Fatigue Life Analysis of a Turboprop Reduction Gearbox

[+] Author and Article Information
D. G. Lewicki, J. J. Coy

Propulsion Laboratory, AVSCOM Research and Technology Laboratories, Lewis Research Center, Cleveland, OH 44135

J. D. Black

Allison Gas Turbine Division, General Motors Corporation, Indianapolis, IN

M. Savage

The University of Akron, Akron, OH

J. Mech., Trans., and Automation 108(2), 255-262 (Jun 01, 1986) (8 pages) doi:10.1115/1.3260811 History: Received June 06, 1985; Online November 19, 2009


A fatigue life analysis of the Allison T56/501 turboprop reduction gearbox was developed. The life and reliability of the gearbox was based on the lives and reliabilities of the main power train bearings and gears. The bearing and gear lives were determined using the Lundberg-Palmgren theory and a mission profile. The five-planet-bearing set had the shortest calculated life among the various gearbox components, which agreed with field experience where the planet bearing had the greatest incidences of failure. The analytical predictions of relative lives among the various bearings were in reasonable agreement with field experience. The predicted gearbox life was in excellent agreement with field data when the material life adjustment factors alone were used. The gearbox had a lower predicted life in comparison with field data when no life adjustment factors were used or when lubrication life adjustment factors were used either alone or in combination with the material factors.

Copyright © 1986 by ASME
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