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Experimental Characterization and Analytical Comparison of Rolling Element Bearing Radial StiffnessRocket engine turbopumps often employ rolling element bearings for rotor support. These bearings frequently provide the primary mechanical interface between the stationary and rotating parts, and are relied upon to provide an adequate stiffness characteristic to ensure small rotor deflection due to a variety of sources of radial load. The rotordynamic design of a turbopump, however, requires a more detailed understanding of the bearing's load-deflection characteristic, to accurately predict critical speed location and response. Accordingly, engineers have developed tools to predict the load-deflection relationship for rolling element bearings. These tools allow the engineer to account for rolling element bearing geometric parameters as well as operational parameters, many of which have been shown to significantly influence a bearing's force-deflection characteristics. To that end, a static test rig has been designed, built, and tested to experimentally measure the radial stiffness of a rolling element bearing in a realistic mounting configuration. The objective of this paper is to report these experimental results and provide a comparison to analytical predictions.
Document ID
20100022166
Acquisition Source
Marshall Space Flight Center
Document Type
Conference Paper
Authors
Earhart, Eric
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Darden, Mark
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Strong, Nunley
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Chilcoat, Thaddeus
(Pratt and Whitney Rocketdyne United States)
Becht, David
(Pratt and Whitney Rocketdyne United States)
Date Acquired
August 24, 2013
Publication Date
May 12, 2010
Subject Category
Spacecraft Propulsion And Power
Report/Patent Number
M09-0791
Meeting Information
Meeting: 40th Aerospace Mechanisms Symposium
Location: Cocoa Beach, FL
Country: United States
Start Date: May 12, 2010
End Date: May 14, 2010
Sponsors: NASA Kennedy Space Center
Funding Number(s)
CONTRACT_GRANT: TTA CLV-J2X-09-206
Distribution Limits
Public
Copyright
Other

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