Research On Security Control For Cyber-Physical Systems Based On T-S Fuzzy Model Approach

With the advent of the industrial 4.0 era and the continuous progress of science and technology,Cyber-Physical Systems(CPS)had come into people's vision.With the organic integration and deep cooperation of 3C(Computer,Communication and Control)technology,a large number of engineering systems have been realized real-time perception and dynamic control.CPS realizes the integrated design of computing,communication and physical systems,which can make the system more efficient,reliable,real-time collaboration,and has an important and broad application prospects.Because the information exchange is in the wireless network environment,it is unavoidable to come from the network internal or external threats.How to deal with these network threats is particularly important for CPS.Most of the existing research results are concentrated on linear systems,while in practical systems the CPS is more nonlinear.In view of this,CPS modeling based on T-S fuzzy model fills the deficiency of the existing research results.Firstly,this thesis expounds the purpose and significance of CPS research,discusses the necessity of CPS research and its important contribution to the actual engineering system,summarizes the common security threats and corresponding countermeasures of CPS,and analyzes the advantages and disadvantages of the current research status at home and abroad.Then,according to the relevant knowledge involved in this thesis,the process and advantages of T-S fuzzy model for modeling nonlinear systems are introduced,as well as the related mathematical knowledge,including linear matrix inequality method,convex optimization,control method and so on.The lemmas for related proof are also listed.This thesis focuses on the CPS network transmission data packet loss and suffers from DoS attacks on the system security zone threats.In view of data packet loss,a new switching control method is proposed to ensure the stability of the system.A new Lyapunov function is used to ensure the exponential stability and reduce the conservatism of the system.Two simulation examples are given to illustrate the feasibility of the control method.In the case of CPS being attacked by DoS,the influence of DoS attack on sensor input and antecedent variables is fully considered.Because some antecedent variables and states of the system are destroyed after DoS attack,a reliable controller is designed based on the idea that some antecedent variables are available and some antecedent variables are unavailable.A switching control strategy based on DoS attack is proposed to ensure the exponential convergence of the system.Finally,the effectiveness of the control method is verified by simulation.