Neighboring Optimal Feedback Control for Trajectories Found by Collocation and Nonlinear Programming
Chen, Jyun-Jye Felipe
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https://hdl.handle.net/2142/85122
Description
Title
Neighboring Optimal Feedback Control for Trajectories Found by Collocation and Nonlinear Programming
Author(s)
Chen, Jyun-Jye Felipe
Issue Date
1997
Doctoral Committee Chair(s)
Conway, Bruce A.
Department of Study
Aerospace Engineering
Discipline
Aerospace Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Mechanical
Language
eng
Abstract
On August 9, 1995, because of a launch vehicle failure the Koreasat 1 satellite was placed into an orbit that was 3,400 nautical miles (6,351 km) lower than the planned geostationary transfer orbit. The Lockheed-Martin company rescue team performed a plan which did put the satellite on station but which consumed about half of the satellite's attitude control and station keeping fuel supply. However the sequence of maneuvers which was used to put the satellite on-station was not determined optimally. In this work it is shown how much fuel might have been saved in this case if the satellite rescue had employed optimal control theory. An optimal solution is found using the DCNLP method and incorporating the most important operational constraints.
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