Simultaneous state and actuator fault estimation for satellite attitude control systems

In this paper, a new nonlinear augmented observer is proposed and applied to satellite attitude control systems. The observer can estimate system state and actuator fault simultaneously. It can enhance the performances of rapidly-varying faults estimation. Only original system matrices are adopted i...

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Bibliographic Details
Published in	Chinese journal of aeronautics Vol. 29; no. 3; pp. 714 - 721
Main Authors	Cheng, Yao, Wang, Rixin, Xu, Minqiang, Li, Yuqing
Format	Journal Article
Language	English
Published	Elsevier Ltd 01.06.2016
Subjects	Actuator fault estimation Actuators Augmented state observer Derivatives Disturbances Estimates Estimating Fault diagnosis Faults Lipschitz nonlinear system Mathematical analysis Satellite attitude control Satellite attitude control system 估计性能卫星姿态控制系统同步执行器故障故障估计时间导数状态线性矩阵不等式 Augmented state observer Fault diagnosis Lipschitz nonlinear system Actuator fault estimation Satellite attitude control system
Online Access	Get full text
ISSN	1000-9361
DOI	10.1016/j.cja.2016.04.010

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Summary:	In this paper, a new nonlinear augmented observer is proposed and applied to satellite attitude control systems. The observer can estimate system state and actuator fault simultaneously. It can enhance the performances of rapidly-varying faults estimation. Only original system matrices are adopted in the parameter design. The considered faults can be unbounded, and the proposed augmented observer can estimate a large class of faults. Systems without disturbances and the fault whose finite times derivatives are zero piecewise are initially considered, followed by a discussion of a general situation where the system is subject to disturbances and the finite times derivatives of the faults are not null but bounded. For the considered nonlinear system, convergence conditions of the observer are provided and the stability analysis is performed using Lyapunov direct method. Then a feasible algorithm is explored to compute the observer parameters using linear matrix inequalities （LMIs）. Finally, the effectiveness of the proposed approach is illustrated by considering an example of a closed-loop satellite attitude control system. The mance in estimating states and actuator faults. It also successfully. simulation results show satisfactory perfor- shows that multiple faults can be estimated
Bibliography:	Actuator fault estimation;Augmented state observer;Fault diagnosis;Lipschitz nonlinear systemSatellite attitude controlsystem In this paper, a new nonlinear augmented observer is proposed and applied to satellite attitude control systems. The observer can estimate system state and actuator fault simultaneously. It can enhance the performances of rapidly-varying faults estimation. Only original system matrices are adopted in the parameter design. The considered faults can be unbounded, and the proposed augmented observer can estimate a large class of faults. Systems without disturbances and the fault whose finite times derivatives are zero piecewise are initially considered, followed by a discussion of a general situation where the system is subject to disturbances and the finite times derivatives of the faults are not null but bounded. For the considered nonlinear system, convergence conditions of the observer are provided and the stability analysis is performed using Lyapunov direct method. Then a feasible algorithm is explored to compute the observer parameters using linear matrix inequalities （LMIs）. Finally, the effectiveness of the proposed approach is illustrated by considering an example of a closed-loop satellite attitude control system. The mance in estimating states and actuator faults. It also successfully. simulation results show satisfactory perfor- shows that multiple faults can be estimated 11-1732/V ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	1000-9361
DOI:	10.1016/j.cja.2016.04.010