Research On Fault Tolerant Control Of Distributed Parameter System In Network Transmission Environment

With the rapid development of modern industry,people's requirements for all kinds of equipment in light,intelligent and precise degree are constantly improving,which makes the fluid system and flexible body vibration system be valued by the scientific and industrial circles.Different from the traditional control systems,these systems have infinite degrees of freedom,and the state of the system cannot be described by the finite parameters as the rigid body system,but the concept of "field"must be introduced,that is,their state is not only a function of time variable but also a function of space variable.This kind of system is called "infinite dimensional distributed parameter system".For the distributed parameter system,this paper will consider the networked control problem when the actuator fails.The main research contents can be summarized as follows:(1)First,the T-S fuzzy model of nonlinear distributed parameter system is given by using the local sector nonlinear approximation theory.Considering the quantization error in the network transmission,the asymptotic stability analysis method and the design method of synchronous quantization fuzzy controller are given.(2)Then,considering the limitation of Lyapunov asymptotic stability in distributed parameter systems,the finite time boundedness(based on L₂ norm)analysis of nonlinear distributed parameter systems is studied.Furthermore,in order to deal with the situation that the jump mode of actuator cannot be obtained and reduce the cost of mode detection,the design method of asynchronous quantization output feedback controller is proposed based on hidden Markov model.(3)By combining time sampling technology and event triggering transmission technology,the sufficient conditions to ensure the finite time boundedness(based on L₂ norm)of nonlinear distributed parameter systems are given,and the design method of reliable event triggering fuzzy controller is proposed.This design approach not only improves the efficiency of network transmission channel,but also avoids the Kino phenomenon.(4)At last,in order to reduce the cost of measurement and control,the combination of incomplete measurement,piecewise control and event triggered transmission is considered.To further expand the application scenario of system bounded control,the sufficient conditions to guarantee the finite time boundedness (based on L_? norm)of the system and the design method of fuzzy controller are given.