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Effects of the motions of a platform-mounted payload on the nutational stability of a dual-spin spacecraft - A Galileo case studyIn the presence of spacecraft nutation, tracking of an inertially fixed target by the Galileo scan platform requires the use of two control loops to move the scan platform and the stator in such a way as to compensate for spacecraft motion. The effect of these control loops on spacecraft nutational stability is examined using an eigenvalue analysis approach as well as several computer analysis packages. It was found that the actions of these control loops tend to drive nutation to the point of neutralizing, and even overpowering the damping actions of the spacecraft nutation damper, for pointing directions close to the spacecraft's poles. Stable and unstable zones are mapped out for two sets of spacecraft mass properties, and contributions of rotor asymmetry and stator flexibility are also discussed.
Document ID
19840058573
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Man, G. K.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Eke, F. O.
(California Institute of Technology, Jet Propulsion Laboratory, Pasadena CA, United States)
Date Acquired
August 12, 2013
Publication Date
August 1, 1984
Subject Category
Spacecraft Design, Testing And Performance
Report/Patent Number
AIAA PAPER 84-1992
Accession Number
84A41360
Distribution Limits
Public
Copyright
Other

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