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Adaptive Control Of Nonlinear Time-delay Systems With Dead-zone Input

Posted on:2021-04-23Degree:MasterType:Thesis
Country:ChinaCandidate:Z H ZhaoFull Text:PDF
GTID:2428330605950598Subject:Control Science and Engineering
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With the deepening of the research,the gradual complication of the object,and lead to practical application in the research of system present nonlinear state,the nonlinear system itself has great complexity.In addition,the external environment interference,dead-zone input and time-delay may exist in the control system,which makes the system research difficult.At the same time,considering the needs of actual engineering,the study of nonlinear system can not only be satisfied with stabilization but also actual output of the system.Therefore,in view of the possible problems in the above reality,this paper studies the adaptive control of a class of nonlinear time-delay systems with dead-zone input.The main research results of this paper are divided into the following three parts:1.For a class of uncertain nonlinear systems with time-delay and nonsymmetric dead-zone,an adaptive output feedback robust control scheme is proposed by extending the high gain observer.Combining dynamic high gain scaling method with backstepping method,and constructing the appropriate Lyapunov-Krasovskii functional,the problem of practical tracking for a class of nonlinear systems with time-delay is studied.Finally,a numerical simulation example is given to illustrate the effectiveness of controller.2.The adaptive tracking control for a class of nonlinear time-delay systems with dead-zone input and uncertain polynomial growth rate is studied.An adaptive robust control scheme is developed by designing an output compensator including two dynamic gains.The stability of the closed-loop system is proved using dynamic high-gain scaling approach and one-step backstepping method,which proves that all closed-loop signals are bounded,while the system output can tracks a class of bounded and time-varying reference trajectories.Finally,two examples are given to illustrate the effectiveness of our control schemes.3.The practical tracking problem of a class of large-scale nonlinear time-delay systems with nonsymmetric dead-zone input is studied.On the basis of the first part,the control scheme is extended to the MIMO systems,and the restrictions are further promoted.The results show that the output of the designed controller can track a class of bounded reference signals with any small error prescribed previously.Finally,a numerical example is given to illustrate controller effective.
Keywords/Search Tags:Nonlinear systems, Dead-zone input, Output feedback, Practical tracking, Lyapunov-Krasovskii functional
PDF Full Text Request
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