NASA NTRS · 19950065494
NASA-GRA--Geared-Rotor Analyzer
Abstract
NASA-GRA computer program designed to solve for steady-state dynamic responses of multigeared rotor systems. Based on transfer-matrix method combined with harmonic-balance method. Includes accurate gear-mesh model for spur and helical gears, containing time-varying mesh stiffnesses, gear-mounting errors, and gear-profile errors. Also includes accurate disk model containing inertia-based dynamic coupling terms due to mass and skew unbalances and massless-elastic-shaft model and linearly coupled fluid-film bearing model. Written in FORTRAN 77.
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Park, N., Kim, D., David, J. W.. 1995-07-01. NASA-GRA--Geared-Rotor Analyzer. https://ntrs.nasa.gov/citations/19950065494
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