ANALYSIS OF TIME-DELAY MAGNETIC DAMPING OF SPACECRAFT LIBRATIONS IN NEAR-SYNCHRONOUS EQUATORIAL ORBITS

Time-lag magnetic damping provides a method of using the earth's 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 para...

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Bibliographic Details
Main Author: Mackison,D. L
Format: Report
Language:English
Subjects:
Astronautics
DAMPING
DIFFERENTIAL EQUATIONS
DIPOLE MOMENTS
EARTH(PLANET)
HYSTERESIS
MAGNETIC FIELDS
MATHEMATICAL MODELS
MOMENTUM
MOTION
OSCILLATION
ROTATION
SATELLITE ATTITUDE
SPACECRAFT
TIME LAG THEORY
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Summary:Time-lag magnetic damping provides a method of using the earth's 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 earth's magnetic field, and holding it constant as the spacecraft librates. When the magnet is turned off, a portion of the satellite's angular momentum has been transferred to the earth's 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) Supplement to Rept. nos. IDEP 347.00.00.00-S6-04 dated Jan 68, AD-668 138 and IDEP 347.95.00.00-S6-09 dated Oct 67, AD-665 686.