Accession Number : ADA195935

Title :   Computerized Life and Reliability Modelling for Turboprop Transmissions.

Descriptive Note : Technical memo.,

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH LEWIS RESEARCH CEN TER

Personal Author(s) : Savage, M ; Radil, K C ; Lewicki, D G ; Coy, J J

PDF Url : ADA195935

Report Date : 13 Jul 1988

Pagination or Media Count : 16

Abstract : A generalized life and reliability model is presented for parallel shaft geared prop-fan and turboprop aircraft transmissions. The transmission life and reliability model is a combination of the individual reliability model for all the bearings and gears in the main load paths. The bearing and gear reliability models are based on classical fatigue theory and the two parameter Weilbull failure distribution. A computer program was developed to calculate the transmission life and reliability. The program is modular. In its present form, the program can analyze five different transmission arrangements. However, the program can be modified easily to include additional transmission arrangements. An example is included which compares the life of a split-torque, parallel compound two-stage transmission, as calculated by the computer program. (jes)

Descriptors :   *TURBOPROP ENGINES, *TRANSMISSIONS(MECHANICAL), BEARINGS, COMPUTER PROGRAMS, DISTRIBUTION, FAILURE, FATIGUE, GEARS, MODELS, PARALLEL ORIENTATION, PARAMETERS, PATHS, RELIABILITY, STAGING, THEORY, TRANSMITTANCE

Subject Categories : Jet and Gas Turbine Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE