Accession Number : AD0786782

Title :   An Experimental Investigation of Torque Noise in Satellite Bearings.

Descriptive Note : Final rept., Mar 71-May 74,

Corporate Author : AEROSPACE CORP EL SEGUNDO CALIF ENGINEERING SCIENCE OPERATIONS

Personal Author(s) : Greer,H. ; Mack,R. A.

Report Date : 01 JUL 1974

Pagination or Media Count : 32

Abstract : Many spin-stabilized spacecraft use precision ball bearings to support and to align an antenna or instrument platform relative to the rotor. The pointing accuracy of the instrument platform is affected by the dynamic fluctuations in running torque or torque noise of the bearings. Although many previous investigations have been concerned with average (or dc) torque, there is a lack of information on the spectral distribution of the torque noise of lightly loaded, large-diameter bearings at slow speeds. This paper summarizes experiments performed on seven pairs of bearings of two bore sizes. Limited measurements of bearing profilometry were made. A special fixture was used to measure torque noise over a range of preload, rotational speed, and temperature. (Modified author abstract)

Descriptors :   *Spacecraft components, *Ball bearings, Spin stabilization, Torque, Noise, Power spectra, Tolerances(Mechanics), Mathematical models

Subject Categories : Machinery and Tools
      Unmanned Spacecraft

Distribution Statement : APPROVED FOR PUBLIC RELEASE