Research Control Of A Class Of Nonlinear Networked Control Systems Based On FHM

The study on linear networked control systems (NCS) has been increasingly mature, while it on nonlinear NCS is still in the initial stage, especially few study on nonlinear NCS has involved the external disturbance suppression. Therefore, it is necessary for more in-depth study on nonlinear NCS and more innovation designing method is in expectation. Fuzzy hyperbolic model (FHM) is a new nonlinear state space model which can be used to approximate a certain class of complex continuous-time nonlinear systems. In this dissertation,the nonlinear NCS is represented by a FHM and the controllers are designed to make sure the closed-loop system is asymptotic stability, considering network-induced delay, packet loss and external disturbance. It should be noted that, in the controller design process, network-induced delay never be restricted or specified but only just be required to meet a certain range. Therefore, the system's network-induced delay can be random, and may be greater than a sampling period. In this dissertation, all controllers are in fuzzy hyperbolic form, easy to implement.Firstly,this dissertation briefly introduces the research development and the performance of NCS in a comparative all-round way and analyzed network-induced delay and packet loss especially, then briefly illustrate the research of FHM.Secondly,FHM is used to estimate the states of the continuous-time nonlinear NCS in order to get a NCS model controlled by hyperbolic network controller (HNC).HNC is itself a kind of fuzzy controller and this nonlinear feedback controller is more reasonable in practical applications compared with the conventional linear feedback controller.Thirdly, the controller design method is presented and the sufficient conditions for asymptotic stability of the closed-loop system are obtained for a class of continuous time nonlinear NCS considering network-induced delay and packet loss. Then the FHM of CSTR system simulation is implemented to prove that the controller is valid. In the end, the disturbance attenuation control scheme is proposed and the controller design method is given based on a FHM for a class of continuous time nonlinear NCS with network-induced delay and packet loss. The controller can guarantee the closed-loop system is asymptotic stability a prescribed disturbance attenuation performance level. Then the simulation of a CSTR system based on FHM also proves that the controller is valid.