NDLI: Bearing optimization for ssme hpotp application

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Bearing optimization for ssme hpotp application

Content Provider	NASA Technical Reports Server (NTRS)
Author	Armstrong, Elizabeth S. Coe, Harold H.
Copyright Year	1988
Description	The space shuttle main engine (SSME) high-pressure oxygen turbopumps (HPOTP) have not experienced the service life required of them. To improve the life of the existing turbopump bearings, modifications to the bearings that could be retrofitted into the present bearing cavity are being investigated. Several bearing parameters were optimized using the computer program SHABERTH, which performs a thermomechanical simulation of a load support system. The computer analysis showed that improved bearing performance is feasible if low friction coefficients can be attained. Bearing geometries were optimized considering heat generation, equilibrium temperatures, and relative life. Two sets of curvatures were selected from the optimization: an inner-raceway curvature of 0.54, an outer-raceway curvature of 0.52, and an inner-raceway curvature of 0.55, an outer-raceway curvature of 0.53. A contact angle of 16 deg was also selected. Thermal gradients through the bearings were found to be lower with liquid lubrication than with solid film lubrication. As the coolant flowrate through the bearing increased, the ball temperature decreased but at a continuously decreasing rate. The optimum flowrate was approximately 4 kg/s. The analytical modeling used to determine these feasible modifications to improve bearing performance is described.
File Size	641551
Page Count	16
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19900019306
Archival Resource Key	ark:/13960/t13n7248p
Language	English
Publisher Date	1988-09-01
Access Restriction	Open
Subject Keyword	Mechanical Engineering Service Life Heat Generation Turbine Pumps Ball Bearings Temperature Gradients Space Shuttle Main Engine Performance Prediction Surface Temperature Lubrication Curvature Optimization Computer Programs Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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