Co-design Between Fault Accommodation And Communication Of Nonuniform Transmission NCS Under DETCS

With the increasing development and cross penetration of computer,network communication and control technology,Network Control System(NCS)has become a common architecture of the control system.Not only does the structure of this system become more complex and the space become more distributed,but also its control function and performance requirements also become more sophisticated,There are more and more problems and challenges that faced,and security issues and solutions have become paramount.The fault-tolerant design of NCS is an important way to improve its safety and reliability,but most of the existing results are based on periodic time-triggered communication scheme(PTTCS)to start the passive fault-tolerant control research.Under this mechanism,transmission of information will not only result in the waste of network resources,but also make the conservative of the conclusion larger and the performance lower.Based on this,this paper combines discrete event-triggering communication scheme(DETCS)into a class of NCS with actuator continuous time-varying fault,network delay and noise,learning from the idea of nonuniform sampling control theory and using a dynamic output feedback control strategy with fault adjustment capability,The co-design between active fault-tolerant control and network communication for nonuniform transmission NCS under DETCS is studied.Specific work is as follows:1)Under DETCS,an active fault-tolerant control system model of nonuniform transmission closed-loop fault linear NCS is established.To achieve co-design between active fault-tolerant control and network communi-cation for NCS,this thesis applies DETCS to NCS firstly,then puts forward the concept of step-by-step implementation.That is,the estimation of the fault and the state is placed into the smart sensor and the dynamic output feedback control law with fault adjustment capability is placed into the controller.Meanwhile,the observer is driven by the time of the physical sampling period and the controller is driven by an event with virtual nonuniform sampling period.Finally,the active fault-tolerant control system model of nonuniform transmission closed-loop fault NCS under DETCS is established.2)The co-design between fault adjustment and communication for nonuniform transmission linear/T-S fuzzy nonlinear NCS under DETCS is studied.Firstly,under the same physical sampling period,using the delay analysis method and Lyapunov stability theory,the design method of linear and T-S fuzzy nonlinear robust generalized observers is given respectively,and fast and accurate estimation of continuous time-varying fault and state is realized.Furtherly,under DETCS,based on the obtained fault and state information,the co-design method between fault adjustment and communication with robust H?performance of nonuniform transmission NCS is given.Finally,a simulation example is given to verify the correctness and feasibility of the results.3)The co-design between fault adjustment and communication for nonuniform transmission linear/T-S fuzzy nonlinear NCS with multi-objective constraints under DETCS is studied.Considering the introduction of multi-objective constraints will make the solution space of controller small,in the certification of the co-design between feedback controller with fault adjustment capability with communication,by constructing a new Lyapunov functional and using less conservative techniques of the improved reciprocal convex combination theory and improved Wirtinger inequality,The design method of linear/T-S fuzzy nonlinear generalized observer with ?-stability and robust H? performance is given respectively,and fast and accurate estimation of continuous time-varying fault and state is realized.Furtherly,under DETCS,based on the obtained fault and state information,the co-design method between fault adjustment and communication with ?-stability and robust H? performance of nonuniform transmission NCS is given.Finally,the simulation results show that in this case the system has less conservativeness,and the introduction of ?-stability constraints can improve the estimated performance of the fault and the state.Meanwhile,With the increasing of ?,the network resource is saved while the system control performance is ensured.4)A virtual active fault-tolerant experimental platform for nonuniform transmis-sion NCS under DETCS is built and the relevant theoretical results are done experimental research.Based on the campus local network and OPC and combined with the existing equipment of the Advanced Control Laboratory,the active fault-tolerant control experimental platform of nonuniform transmission NCS is built under DETCS,in which the controlled object,the observer and the event trigger condition are placed into a PC client,fault adjustment and feedback controller are placed into another PC client,and the theoretical results of 2)and 3)are experimentally verified.The results show that the experimental results of the nonuniform transmission virtual active NCS platform are in good agreement with the simulation results in the single plane,and further show the correctness and usability of the theoretical results.