Finite-time fault tolerant attitude control for over-activated spacecraft subject to actuator misalignment and faults

• Published in: IET control theory & applications Vol. 7; no. 16; pp. 2007 - 2020
• Main Authors: Zhang, Aihua, Hu, Qinglei, Friswell, Michael I
• Format: Journal Article
• Language: English
• Published: Stevenage The Institution of Engineering and Technology 01.11.2013; John Wiley & Sons, Inc
• Subjects: actuator faults; actuator misalignment; Actuators; attitude control; commanded control; compensation; control system synthesis; energy consumption; external disturbances; fault tolerance; finite‐time attitude compensation control scheme; finite‐time fault tolerant attitude control; finite‐time reachability; Karush–Kuhn–Tucker condition; numerical simulation; optimised control allocation algorithm; over‐activated rigid spacecraft; over‐activated spacecraft; sliding mode control theory; space vehicles; sufficient condition; system states; uncertain inertia parameters; variable structure systems; fault tolerance; finite-time fault tolerant attitude control; actuator misalignment; actuator faults; optimised control allocation algorithm; control system synthesis; space vehicles; commanded control; finite-time reachability; over-activated rigid spacecraft; actuators; finite-time attitude compensation control scheme; sliding mode control theory; uncertain inertia parameters; attitude control; system states; Karush–Kuhn–Tucker condition; compensation; over-activated spacecraft; external disturbances; sufficient condition; energy consumption; variable structure systems; numerical simulation
• ISSN: 1751-8644; 1751-8652
• DOI: 10.1049/iet-cta.2013.0133

A finite-time attitude compensation control scheme is developed for an over-activated rigid spacecraft subject to actuator faults, misalignment, external disturbances and uncertain inertia parameters. The controller is synthesised based on the sliding mode control theory, and guarantees the finite-time reachability of the system states. A sufficient condition for the controller to accommodate misalignment and faults of actuator is presented. An optimised control allocation algorithm based on the Karush–Kuhn–Tucker condition is then applied to distribute the commanded control to each actuator, and optimise the consumption of energy. Numerical simulation results are presented that highlight the performance benefits of the control law.