ANALYSIS OF TIME-DELAY MAGNETIC DAMPING OF SPACECRAFT LIBRATIONS IN NEAR-SYNCHRONOUS EQUATORIAL ORBITS.
JOHNS HOPKINS UNIV SILVER SPRING MD APPLIED PHYSICS LAB
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Time-lag magnetic damping provides a method of using the earths magnetic field for rapid libration damping of satellites when the field strength is insufficient to dissipate energy with magnetic hysteresis material. This consists of generating a spacecraft-fixed magnetic dipole, initially parallel to the earths magnetic field, and holding it constant as the spacecraft librates. When the magnet is turned off, a portion of the satellites angular momentum has been transferred to the earths magnetic field. A mathematical model is developed relating the dipole moment, the dipole holding time, and the initial attitude to the energy dissipation rate. Comparisons are made between the results predicted analytically by the damping model and those obtained by numerical integration of the differential equations of attitude motion. Author