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NASA-GRA--Geared-Rotor AnalyzerNASA-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.
Document ID
19950065494
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Tech Brief
Authors
Park, N. (Pusan National Univ.)
Kim, D. (Ulsan Univ.)
David, J. W. (North Carolina State Univ.)
Date Acquired
August 17, 2013
Publication Date
July 1, 1995
Publication Information
Publication: NASA Tech Briefs
Volume: 19
Issue: 7
ISSN: 0145-319X
Subject Category
Machinery
Report/Patent Number
LEW-15148
Accession Number
95B10335
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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