Fault tolerant attitude control of under-actuated spacecraft: Theory and experiment |
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Institution: | College of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China |
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Abstract: | This paper investigates fault tolerant attitude control theory and experiment for under-actuated spacecraft with one reaction wheel completely broken and two others suffering actuator faults of partial loss of effectiveness or bias. A non-smooth robust adaptive fault tolerant control law is proposed under the zero-momentum and input saturation conditions. It shows that the available reaction wheels need to produce sufficient control torque for the fault tolerance. Such a new control method is implemented in a semi-physical simulation system of an air-bearing platform. Experimental results show the effectiveness of the proposed method in spacecraft practical engineering. |
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Keywords: | Actuator fault Air-bearing platform Fault tolerant control Semi-physical experiment Under-actuated spacecraft |
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