| With the rapid growing application of science and technology, the industrial equipment becomes more complicated. And the security and reliability of the equipment, especially for the large-scale complicated equipment, is attracted more and more attention. If any components fail and can't be disposed in time when the equipment is running, it will not only result in great economic loss but also probably endanger people's safety, which will have a bad influence in society. With the development of automatic manufacturing, it is impossible to satisfy the requirements of modern manufacturing to possess security, reliability and steadiness only by traditionally passive maintenance. The security and reliability have become two important goals of systems designing and developing.Fault-tolerant control(FTC), developed in 1980's, is a kind of control technology which aims at improving systems reliability. It is to ensure the system running continuously with security, effectivity and reliability or performing the expected function at specified time at the cost of losing some performance by using some effective methods, when one or more than one component of the system fails or is ready to fail.Robust fault-tolerant control is the focus in the research of FTC recently. It is to design a robust controller in advance to ensure the system possessing integrity against sensor or actuator failures. Based on a general representation of sensor and actuator failures, we study some kinds of robust fault-tolerant control problems for uncertain systems and uncertain time delay systems which are described as state-space models. Concerning the linear systems with norm-bounded uncertainties, the analysis of robust stability, the design methods of robust stabilization controller and the design of controller that guarantee certain robust performance by state feedback are investigated, and later we obtain some corresponding results. The main contents of this paper are outlined as follows,1. The problem of robust stability for a class of uncertainty time delay continuous systems is studied. Based on Riccati equation and Lyapunov stability theory, a sufficient condition for the system to be asymptotically stable against sensor and actuator failures is presented and the corresponding design method of robust fault-tolerant control laws by state feedback is provided. An illustrative example is given to illustrate the obtained results.2. The robust stabilization problem for time delay uncertainty continuous systems is considered. By using linear matrix inequality, a sufficient and necessary conditionfor the system robust stabilization is presented, and the results are given in terms of linear matrix inequalities. A simulation example is given finally.3. For a class of discrete systems with norm-bounded uncertainties, the robust fault-tolerant H∞ control problem is studied. The existent condition of the robust fault-tolerant H∞ controller by state feedback is obtained, and also we give the algebra expression of the controller.4. The fault-tolerant control problem for the cascaded systems which are universal in reality is considered. First, the sufficient condition for the system to be asymptotically stable is given on the condition of system failures as well as on the scope of H ∞ norm without parameter perturbation. Second, the fault-tolerant control problem for the cascaded systems is studied in the case of parameter perturbation. We also give the sufficient condition for the system to be asymptotically stable.5. The application problem of fault-tolerant control in tobacco re-drying process control is studied. We build the state-space model of one re-drying room. Then the fault-tolerant controller by state feedback against sensor and actuator failures which exist substantively in the system of the re-drying room is presented. And an illustrative example is given to illustrate the designed results. Finally, the fault-tolerant control project to ensure the whole re-drying process possessing stability i... |
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