An analytical method to predict efficiency of aircraft gearboxesA 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 oil based on disc 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.
Document ID
19840061393
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Anderson, N. E. (U.S. Army, Propulsion Laboratory, Cleveland OH, United States)
Loewenthal, S. H. (NASA Lewis Research Center Cleveland, OH, United States)
Black, J. D. (General Motors Corp. Detroit Diesel Allison Div., Indianapolis, IN, United States)