| Networked Control Systems (NCS) is a feedback control system of closed loop through the network. NCS not only can share the information resources to facilitate system expansion, but also low cost, easy maintenance, high reliability. However, when NCS is through the sharing of information resources to achieve control of the superiority of the challenges, due to limited network communication bandwidth, this resulted in the network delay and packet loss, network congestion and other issues. In practical engineering, because of modeling errors, working conditions, environment changes and the impact of various unknown input, also allows the controlled object uncertainty. In addition, the nonlinear characteristics are more or less present in all systems, so uncertain nonlinear NCS with a broader background in application.Modern NCS not only large and complex, the system security and reliability requirements are also high, so fault-tolerant control of NCS are thus more and more attention. However, the results focus on the existing line of the controlled object, the network delay and packet loss is relatively higher than a single treatment. The performance mainly in the integrity of the main conclusions more conservative as having relatively large time delay is not dependent. Therefore, the uncertainty of nonlinear NCS takes into account the impact of packet loss and delay. Delay-dependent approach to robust fault tolerant control of their conduct research will undoubtedly have a profound scientific significance and wide practical significance.Based on this, this paper based on T-S model for the study of nonlinear NCS, by taking into account the delay and packet loss and the uncertainties to delay-dependent manner, integrated application Lyapunov stability theory, LMI, the introduction of slack matrix variables such as methods and techniques, and using state feedback control law, research following robust fault tolerant control work:1) The problem of robust integrity for nominal and parameter uncertain nonlinear of NCS is studied in this paper. Respectively, for nominal and parameter uncertain of NCS, the delay-dependent sufficient conditions for system with integrity and robust integrity against sensor or actuator failures are given, and the method of controller design is given via solving several linear and nonlinear matrix inequalities.2) The problem of H∞robust fault-tolerant control for nominal and parameter uncertain nonlinear of NCS is studied in this paper. Considering the disturbance of limited energy, the delay-dependent sufficient conditions for nominal and parameter uncertain of NCS with H∞integrity and H∞robust integrity against sensor or actuator failures are given respectively, and the method of controller design is given. Moreover, the maximum allowable intervalδof the system with H∞robust integrity is studied, and the optimal H∞robust integrity controller is designed on the known network parameter condition3) The guaranteed cost robust fault tolerant control for nonlinear NCS with the nominal and parameter uncertain is investigated. Consider the fault-tolerant systems for dynamic performance requirements, by defining performance index, the delay-dependent sufficient condition of the guaranteed cost fault tolerant control and robust fault tolerant control with NCS against actuators or sensor failure are derived, meanwhile, the design method of the conreoller is given.4) In the above research conclusion, the accuracy and efficiency for all the result of the simulation is dissused using simulation example.The mode transformation is not used in the process of the paper, and the free weight matrix is appropriate introduced. So all result have less conservative which have significance for improving the fault tolerant satisfaction and saving resources of network communication.5) The conclusion is not only providing theoretical for the nonlinear NCS with fault tolerant design, but also providing a reference for the corresponding the nonlinear-delay NCS with fault tolerant design. |
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