Accession Number : AD0696062

Title :   ON THE MOTION AND STABILITY OF A DUAL-SPIN SATELLITE WITH NUTATION DAMPING.

Descriptive Note : Technical memo.,

Corporate Author : JOHNS HOPKINS UNIV SILVER SPRING MD APPLIED PHYSICS LAB

Personal Author(s) : Bainum,Peter M. ; Fuechsel,Peter G. ; Mackison,Donald L.

Report Date : JUN 1969

Pagination or Media Count : 47

Abstract : The damping and stability characteristics of a dual-spin satellite system are analyzed. The system consists of: a slowly rotating main part; a high-speed rotor whose spin axis is parallel to the nominal main body spin axis; and one or two pendulous type nutation dampers, pivoted about a torsion wire support and constrained to move in a plane that is perpendicular to the nominal spin axis. After development and linearization of the equations of motion, the necessary and sufficient Routh-Hurwitz stability criteria are obtained. The damping system design is optimized by repeated examination of the roots of the system characteristic equation. Numerical studies using the nonlinear equations were conducted to evaluate the spin axis pointing error, attributed to the dynamic mass unbalance of the main body in a torque-free environment. (Author)

Descriptors :   (*SCIENTIFIC SATELLITES, SPIN STABILIZATION), (*ORBITS, STABILITY), OSCILLATION, DAMPING, EQUATIONS OF MOTION, MOMENT OF INERTIA, NUMERICAL ANALYSIS, KINETIC ENERGY, ATTITUDE CONTROL SYSTEMS, OPTIMIZATION

Subject Categories : Unmanned Spacecraft
      Spacecraft Trajectories and Reentry

Distribution Statement : APPROVED FOR PUBLIC RELEASE