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Adaptive Robust Control for State-Delayed and Uncertain Nonlinear Systems

Author: ZhuZhiHao
Tutor: LuoXiaoYuan
School: Yanshan University
Course: Systems Engineering
Keywords: Nonlinear systems Uncertainty Sliding Mode Control Delay Adaptive control
CLC: TP13
Type: Master's thesis
Year: 2010
Downloads: 83
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Abstract


As we all know , nonlinear widely exists in the objective world , any actual dynamic systems are non-linear, non - linear system has become one of the hot and difficult problems of control theory research in the field . Uncertainty and delay widely present in the non-linear system , and will affect the stability of the system . In this paper, uncertainties and delay characteristics of nonlinear systems universality , to carry out robust control , made ??the following research work . Firstly, the paper partial differential transformation technique , the exponential reaching sliding mode control technology and Lyapunov stability method to study a broader class of uncertain nonlinear systems sliding mode controller design problem . The proposed controller overcomes the impact of uncertainty on the system , ensure that the system can reach the sliding surface within a limited time , and can effectively weaken the system jitter . Finally, the simulation results verify the effectiveness of the proposed control method . Secondly , based on adaptive control and fuzzy control theory , combined with the dynamic surface control method , a simplified adaptive fuzzy dynamic surface controller design method . In the controller design process , using only a fuzzy logic system as an approximation , making all the unknowns to be compensated , while the use of adaptive technology for online identification of unknown parameters and approximation error bound . By constructing a suitable Lyapunov function , all the signals of the closed-loop system for semi-global uniform ultimate boundedness . The text of the control method overcomes the design process of a class of unknown nonlinear time-delay system controller introduced the \Finally, for a class of uncertain nonlinear systems , a new adaptive fuzzy dynamic surface controller design to solve the problems of uncertain nonlinear systems controller design process introduced approximation excessive . By constructing a suitable Lyapunov function , all the signals of the closed-loop system for semi-global uniform ultimate boundedness . Were compared with the sliding mode control method , the superiority of this method .

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