naa a22 4500 510774385 CHVBK 20180411083225.0 cr unu---uuuuu 180411e20130601xx s 000 0 eng 10.1007/s40295-014-0021-1 doi (NATIONALLICENCE)springer-10.1007/s40295-014-0021-1 Observer-Based Fault Diagnosis Incorporating Online Control Allocation for Spacecraft Attitude Stabilization under Actuator Failures [Elektronische Daten] [Qinglei Hu, Bo Li, Michael Friswell] This paper proposes a novel observer-based fault diagnosis method, incorporating an online control allocation scheme, for an orbiting spacecraft in the presence of actuator failures/faults, unexpected disturbances and input saturation. The proposed scheme solves a difficult problem in spacecraft fault tolerant control design by compensating for the loss in effectiveness and time-varying faults using redundant actuators, so that the overall system is stable, despite external disturbances and input saturation. This is accomplished by developing an observer-based fault diagnosis mechanism to reconstruct or estimate the actuator faults/failures. An online control allocation scheme is then used to redistribute the control signals to the healthy actuators in the case of faults/failures, without reconfiguring the controller, so that the control signal distribution is based on the reconstructed actuator effectiveness level. Simulation results using a rigid spacecraft model show good performance in the presence of faults, including total actuator failure scenarios, external disturbances and actuator input saturation, which validates the effectiveness and feasibility of the proposed scheme. American Astronautical Society, 2014 Fault diagnosis nationallicence Fault tolerant control nationallicence Spacecraft nationallicence Control allocation nationallicence Input saturation nationallicence Hu Qinglei School of Automation Science and Electrical Engineering, Beihang University, 100191, Beijing, China aut Li Bo Department of Control Science and Engineering, Harbin Institute of Technology, 150001, Harbin, China aut Friswell Michael College of Engineering, Swansea University, Singleton Park, SA2 8PP, Swansea, UK aut The Journal of the Astronautical Sciences Springer US; http://www.springer-ny.com 60/2(2013-06-01), 211-236 0021-9142 60:2<211 2013 60 40295 https://doi.org/10.1007/s40295-014-0021-1 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s40295-014-0021-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Hu Qinglei School of Automation Science and Electrical Engineering, Beihang University, 100191, Beijing, China aut NATIONALLICENCE 700 1- Li Bo Department of Control Science and Engineering, Harbin Institute of Technology, 150001, Harbin, China aut NATIONALLICENCE 700 1- Friswell Michael College of Engineering, Swansea University, Singleton Park, SA2 8PP, Swansea, UK aut NATIONALLICENCE 773 0- The Journal of the Astronautical Sciences Springer US; http://www.springer-ny.com 60/2(2013-06-01), 211-236 0021-9142 60:2<211 2013 60 40295 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer