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Power turbine dynamics - An evaluation of a shear-mounted elastomeric damperAs an alternative to the more conventional squeeze-film bearing damper designs, a Viton-70 shear-mounted, elastomeric damper was built and tested in a T-55 power turbine high-speed balancing rig. This application demonstrated, for the first time, the feasibility of using elastomers as the primary rotor damping source in production turbine engine hardware. The shear-mounted damper design was selected because of its compatibility with actual gas turbine engine radial space constraints, its accommodation of both the radial and axial thrust loads present in gas turbine engines, and its capability of controlled axial preload. Test results showed that the Viton-70 elastomeric damper operated successfully and provided excellent control of both synchronous and nonsynchronous vibrations through all phases of testing to the maximum rotor speed of 1676 rad/s (16,000 rpm). Excellent correlation between the predicted and experienced critical speeds, mode shapes, and log decrements for the power turbine rotor and elastomer damper assembly was also achieved.
Document ID
19830066807
Document Type
Conference Paper
Authors
Zorzi, E. S.
(Mechanical Technology, Inc. Latham, NY, United States)
Walton, J.
(Mechanical Technology, Inc. Latham, NY, United States)
Cunningham, R.
(NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
August 11, 2013
Publication Date
March 1, 1983
Subject Category
Mechanical Engineering
Report/Patent Number
ASME PAPER 83-GT-228
Funding Number(s)
CONTRACT_GRANT: NAS3-21623
CONTRACT_GRANT: NAS3-20609
Distribution Limits
Public
Copyright
Other
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