Reorientation of Asymmetric Rigid Body Using Two Controls. (26th September 2013)

• Record Type: Journal Article
• Authors: Kim, Donghoon; Turner, James D.; Leeghim, Henzeh
• Other Names: Abudiab Mufid Academic Editor.
• Is Part Of: Mathematical problems in engineering. Volume 2013(2013)
• Publication Date: 2013-09-26
• Subjects: Engineering mathematics -- Periodicals; 510.2462
• DOI: 10.1155/2013/708935
• Languages: English
• ISSNs: 1024-123X

Abstract

Abstract : Most spacecrafts are designed to be maneuvered to achieve pointing goals. This is accomplished usually by designing a three-axis control system, which can achieve arbitrary maneuvers, where the goal is to repoint the spacecraft and match a desired angular velocity at the end of the maneuver. New control laws are required, however, if one of the three-axis control actuators fails. This paper explores suboptimal maneuver strategies when only two control torque inputs are available. To handle this underactuated system control problem, the three-axis maneuver strategy is transformed to two successive independent submaneuver strategies. The first maneuver is conducted on one of the available torque axes. Next, the second maneuver is conducted on the torque available plane using two available control torques. However, the resulting control law is more complicated than the general three-axis control law. This is because an optimal switch time needs to be found for determining the end time for the single-axis maneuver or the start time for the second maneuver. Numerical simulation results are presented that compare optimal maneuver strategies for both nominal and failed actuator cases.