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Mathematical Problems in Engineering
Volume 2015, Article ID 429361, 16 pages
http://dx.doi.org/10.1155/2015/429361
Research Article

Adaptive Observer-Based Fault-Tolerant Control Design for Uncertain Systems

1College of Automation, Harbin Engineering University, Harbin 150001, China
2China Ship Development & Design Center, Wuhan 430064, China

Received 15 October 2014; Revised 10 January 2015; Accepted 12 January 2015

Academic Editor: Xinggang Yan

Copyright © 2015 Huaming Qian et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This study focuses on the design of the robust fault-tolerant control (FTC) system based on adaptive observer for uncertain linear time invariant (LTI) systems. In order to improve robustness, rapidity, and accuracy of traditional fault estimation algorithm, an adaptive fault estimation algorithm (AFEA) using an augmented observer is presented. By utilizing a new fault estimator model, an improved AFEA based on linear matrix inequality (LMI) technique is proposed to increase the performance. Furthermore, an observer-based state feedback fault-tolerant control strategy is designed, which guarantees the stability and performance of the faulty system. Moreover, the adaptive observer and the fault-tolerant controller are designed separately, whose performance can be considered, respectively. Finally, simulation results of an aircraft application are presented to illustrate the effectiveness of the proposed design methods.