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| Received:January 14, 2008Revised:September 12, 2008 |
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| Adaptive fault-tolerant control of linear systems with actuator saturation and L2-disturbances |
| Wei GUAN, Guanghong YANG |
| (Key Laboratory of Integrated Automation for the Process Industry, Ministry of Education, and College of Information Science and Engineering, Northeastern University, Shenyang Liaoning 110004, China; School of Automation, Shenyang Institute of Aeronautical Engineering, Shenyang Liaoning 110136, China) |
| Abstract: |
| This paper studies the problem of designing adaptive fault-tolerant H-infinity controllers for linear timeinvariant
systems with actuator saturation. The disturbance tolerance ability of the closed-loop system is measured by an optimal index. The notion of an adaptive H-infinity performance index is proposed to describe the disturbance attenuation
performances of closed-loop systems. New methods for designing indirect adaptive fault-tolerant controllers via state
feedback are presented for actuator fault compensations. Based on the on-line estimation of eventual faults, the adaptive
fault-tolerant controller parameters are updated automatically to compensate for the fault effects on systems. The designs
are developed in the framework of the linear matrix inequality (LMI) approach, which can guarantee the disturbance tolerance ability and adaptive H-infinity performances of closed-loop systems in the cases of actuator saturation and actuator failures. An example is given to illustrate the efficiency of the design method. |
| Key words: Actuator saturation Linear systems Adaptive control Fault-tolerant control Disturbance tolerance LMIs H-infinity control |
