Accession Number:

ADB007253

Title:

Investigation of Cage and Bearing Instability in Despun Antenna Bearings Due to Changes in Lubricant Properties

Descriptive Note:

Summary rept. no. 1, 1 Feb 1974-31 Jan 1975

Corporate Author:

BATTELLE COLUMBUS DIV OH

Personal Author(s):

• Kannel, J. W.
• Bupara, S. S.
• Pentlicki, C. J.

Report Date:

1975-04-01

Pagination or Media Count:

70.0

Abstract:

A computer program is being developed for the purpose of investigating cage and bearing instability in a despun antenna bearings. The program utilizes empirical inputs to ensure accuracy of the analytical modeling and comparison with experimental cage-dynamics data are being made to validate the computer predictions. As a result of the experimental and analytical studies conducted thus far, a stability criterion is being postulated. One form of this criterion, denoting the state of stability of the system, can be written as D sub p 4 C sub mu to the 2nd powerm sub e C sub S where c sub mu related to lubrication parameters, M sub e is the effective cage mass, and C sub s is a cage material-geometry parameter. If D sub p is less than unity, the cage is predicted to be stable. Conversely, if D sub p is greater than unity, an instability should occur.

Descriptors:

• *BALL BEARINGS
• *COMPUTER PROGRAMS
• *SATELLITE ANTENNAS
• ARTIFICIAL SATELLITES
• ATTITUDE CONTROL SYSTEMS
• BEARINGS
• COMPUTERIZED SIMULATION
• DYNAMICS
• EXPERIMENTAL DATA
• GEOMETRY
• INPUT
• INSTABILITY
• LIFE EXPECTANCY(SERVICE LIFE)
• LUBRICANTS
• LUBRICATION
• MASS
• MATERIALS
• MATHEMATICAL PREDICTION
• PERFORMANCE(ENGINEERING)
• RELIABILITY

Subject Categories:

• Computer Programming and Software
• Machinery and Tools
• Unmanned Spacecraft

Distribution Statement:

APPROVED FOR PUBLIC RELEASE