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| Received:December 06, 2007Revised:March 08, 2010 |
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| Robust fault-tolerant controller design for linear time-invariant systems with actuator failures: an indirect adaptive method |
| Xiaozheng JIN,Guanghong YANG,Yanping LI |
| (Key Laboratory of Manufacturing Industrial Integrated Automation, Shenyang University, Shenyang Liaoning 110044, China; 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) |
| Abstract: |
| In this paper, indirect adaptive state feedback control schemes are developed to solve the robust faulttolerant control (FTC) design problem of actuator fault and perturbation compensations for linear time-invariant systems. A more general and practical model of actuator faults is presented. While both eventual faults on actuators and perturbations are unknown, the adaptive schemes are addressed to estimate the lower and upper bounds of actuator-stuck faults and perturbations online, as well as to estimate control effectiveness on actuators. Thus, on the basis of the information from adaptive schemes, an adaptive robust state feed-back controller is designed to compensate the effects of faults and perturbations automatically. According to Lyapunov stability theory, it is shown that the robust adaptive closed-loop systems can be ensured to be asymptotically stable under the influence of actuator faults and bounded perturbations. An example is provided to further illustrate the fault compensation effectiveness. |
| Key words: Fault-tolerant control Actuator failures Adaptive robust control Asymptotic stability |
