Research On Control Of Information-constrained Feedback Nonlinear Systems

The research of feedback nonlinear systems is one of the core contents of control theory,which has attracted extensive attention of scholars at home and abroad.At the same time,it has been applied to industry,national defense,aerospace and other fields.By appropriate variable substitution,many practical engineering systems can be modeled and transformed into feedback nonlinear systems.In order to better meet the performance requirements of the actual system,it is very meaningful to study the control with information constraints.In this thesis,the information constraints can be divided into quantization constraints,state constraints and output constraints.They have the advantages of saving communication resources and improving system security indexes.At present,although some representative results have been made in the control of feedback nonlinear systems with information constraints,the research is still in the incomplete stage.Therefore,this thesis will further improve the control framework of feedback nonlinear systems with information constraints.The main contents of this thesis can be summarized as follows:·Tracking control for a class of quantization-constrained feedback nonlinear systems is investigated.Based on gain technique,a controller with energy saving and disturbance rejection is designed.By choosing appropriate gain and quantization parameters,the designed control strategy ensures that all states of the closed-loop system are bounded,and the practical tracking performance can be achieved.(Chapter 2 in the thesis)·Tracking control for a class of state-constrained feedback nonlinear systems is studied.Combining barrier Lyapunov function and Nussbaum-type function,a novel adaptive controller is designed by using backstepping technique.Through Lyapunov stability analysis,the designed control strategy ensures that all states of the closed-loop system are bounded,the practical tracking performance can be achieved,and partial state constraints are never violated.(Chapter 3 in the thesis)·Consensus control for a class of output-constrained feedback nonlinear multi-agent systems is considered.By constructing state transformations and introducing related variables,a novel distributed protocol is proposed.Through Lyapunov stability analysis,the designed distributed strategy ensures that all states of the closed-loop system are bounded,the consensus can be achieved asymptotically,and the output constraints are never violated.(Chapter 4 in the thesis)...