The Study Of Robust Fault-tolerant Control Based On Delay Model For Networked Control Systems

Networked Control Systems is the communications network as a system aspect embedded control systems,its control circuit was linked through the closed-loop real-time network.Because of its primary advantages:cost savings,resource sharing, systems and data were formed flexibility has become an objective requirement for the development of complex control system and remote control system and is widely used in the construction of the national economy and national defense fields.However, while the NCS brought lots of conveniences to us through exchanging data among devices connected to the shared medium,due to network bandwidth constraints and the complexity of network transmission,information transmission exist inevitable packet loss,congestion,delay and other issues,combined with practical engineering uncertainties as well as sensors or actuators and other parts of the failure usually affect the system dynamic characteristics as well as instability brought new challenges to the traditional control theory.The study of Robust fault-tolerant control for networked control systems not only had theoretical value but also had strong practical value.Based on the Lyapunov stability theory,through using linear matrix inequality, this paper proposes analysis and synthesis method for the networked control systems with different plant by designed new controllers,the contents of this paper are summarized as follows:1)Adopting state feedback control strategy,the problem of robust fault-tolerant control for networked control systems(NCS) with uncertain disturbance and uncertain parameter is discussed in this paper,a sufficient condition for closed-loop networked control system with uncertainty against actuar or sensor failures was subject to the robust integrity and the H_∞performance were derived,the design approach of controller were also given.Lastly,the result of simulation verified the correctness and validity of conclusions.2)Adopting static output feedback control strategy,the problem of robust fault-tolerant control for networked control systems(NCS) with uncertainty of time-delay was discussed,the sufficient condition for closed-loop networked control system against actuar or sensor failures were subject to the robust integrity was derived,the design approach of controller were also given.Lastly,the result of simulation verified the correctness and validity of conclusions.3)Adopting static output feedback control strategy,the problem of robust fault-tolerant control for networked control systems(NCS) with uncertaintier of time-delay and parameter were discussed.The sufficient conditions for closed-loop networked control system against actuar or sensor failures were subject to the robust integrity was derived,the design approach of controller was also given.Lastly,the result of simulation verified the correctness and validity of conclusions.4)Adopting dynamic output feedback control strategy,based on the time-delay model,the problem of robust fault-tolerant control for networked control systems (NCS) with uncertain time-delay was discussed in this paper,a sufficient condition for closed-loop networked control system with uncertainty against actuar or sensor failures was subject to the robust integrity was derived,the design approach of controller was also given.Lastly,the result of simulation verified the correctness and validity of conclusions.