Accession Number : AD0699556

Title :   A GENERALIZED APPROACH TO GRAVITY-GRADIENT STABILIZATION OF GYROSTAT SATELLITES,

Corporate Author : RAND CORP SANTA MONICA CALIF

Personal Author(s) : Longman,R. W.

Report Date : NOV 1969

Pagination or Media Count : 141

Abstract : An investigation was made of the effect of an internal spinning rotor on the attitudes and stability properties of a satellite employing gravity-gradient stabilization. The study considers all possible rotor directions and speeds, and all possible satellite inertias. The set of equilibrium orientations for each of these gyrostat configurations is investigated, and the stability of new solutions is analyzed in order to determine their usefulness in the design of future satellite systems. Also, a simple geometric visualization is presented for the set of all orientations that can be made into equilibria by proper choice of rotor axis and rate of rotation. The discovery of a continuum of equilibrium orientations for certain gyrostat configurations suggests a possible explanation for the observed sudden tumbling of some gravity-gradient stabilized satellites that use long, flexible booms. (Author)

Descriptors :   (*SCIENTIFIC SATELLITES, ORBITS), (*GYRO STABILIZERS, MATHEMATICAL ANALYSIS), GRAVITY, EQUILIBRIUM(PHYSIOLOGY), STABILITY, EQUATIONS OF MOTION, VECTOR ANALYSIS, CELESTIAL MECHANICS

Subject Categories : Unmanned Spacecraft
      Spacecraft Trajectories and Reentry

Distribution Statement : APPROVED FOR PUBLIC RELEASE