Relationships Between Maneuver Time and Energy for Reaction Wheel Attitude Control
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Authors
Marsh, Harleigh C.
Karpenko, Mark
Gong, Qi
Subjects
Advisors
Date of Issue
2018
Date
2018
Publisher
American Institute of Aeronautics and Astronautics (AIAA)
Language
Abstract
The dichotomy between minimum time and minimum effort is well known. Minimum-time solutions are synonymous with large effort, whereas minimum effort solutions imply large time horizons. Shortest-time attitude maneuvers are minimum-time slews for agile reorientation of space vehicles. Intuition and experience would suggest that such maneuvers are expensive in terms of effort. This paper will show that this is not the case: Agile maneuvers exist within the energy budget associated with conventional attitude control systems. Moreover, even for conventional slew strategies (such as eigenaxis), energy requirements can be reduced. The energy savings are realized via a reallocation of the control effort by exploiting null motions within the control space, over the maneuver trajectory. A cost functional for minimum-energy slews is developed that is in line with true energy cost associated with reaction wheel-based attitude control systems. This energy metric is incorporated into a family of constrained nonlinear optimal control formulations whose solutions present a relationship between transfer time and energy. Both agile (off-eigenaxis) slews and conventional (eigenaxis) slews are studied. A trade space between transfer time and energy is identified, which can be exploited for mission operations, planning, and design.
Type
Article
Description
The article of record may be found at https://doi.org/10.2514/1.G002843
Series/Report No
Department
Mechanical and Aerospace Engineering (MAE)
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Format
14 p.
Citation
Marsh, Harleigh C., Mark Karpenko, and Qi Gong. "Relationships Between Maneuver Time and Energy for Reaction Wheel Attitude Control." Journal of Guidance, Control, and Dynamics 41.2 (2018): 335-348.
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.