一类非线性严格反馈系统基于观测器的自适应模糊控制

发布时间：2018-02-02 12:20

本文关键词： 自适应控制模糊逻辑系统严格反馈 Backstepping　出处：《青岛大学》2017年硕士论文　论文类型：学位论文

【摘要】：工业工程中非线性和时滞现象是普遍存在的,而系统存在的非线性,不确定性和时滞等因素会影响系统的性能,也对系统的控制设计带来一定的困难。近年来,随着现代技术的进步,非线性系统和时滞系统的分析与控制设计也成为专家学者关注的热点。运用模糊逻辑系统的逼近理论与自适应backstepping技术相结合的控制设计方法受到极大关注。严格反馈系统虽是纯反馈系统的特殊形式,但其控制设计与性能分析具有广泛的应用背景。本文主要研究了单输入单输出非线性严格反馈系统及其时滞系统的控制设计问题。主要内容如下:第一,研究了一类单输入单输出非线性严格反馈系统,利用自适应模糊backstepping方法构建系统控制器,由于此系统状态是不可直接测量的,所以设计状态观测器估计系统的状态变量。为减少系统状态变量的估计误差,在观测器中设置模糊逻辑系统,增加状态估计值的准确度。运用凸组合和矩阵不等式求解观测增益矩阵,解决了现有的观测器设计与观测误差动态稳定性的不一致的问题。第二,研究了一类非线性严格反馈时滞系统的自适应模糊控制问题。将上述获得的基于观测器的模糊自适应输出反馈控制设计方法进一步扩展到非线性严格反馈时滞系统上,给出了相应的模糊自适应输出反馈镇定控制方案。第三,针对上述两类非线性系统进行仿真研究。
[Abstract]:Nonlinear and time-delay phenomena are common in industrial engineering, but the nonlinear, uncertain and time-delay of the system will affect the performance of the system, and it will also bring some difficulties to the control design of the system in recent years. With the progress of modern technology. The analysis and control design of nonlinear systems and time-delay systems have also become the focus of attention of experts and scholars. Control Design combining the approximation Theory of Fuzzy Logic Systems with Adaptive backstepping Technology. The strict feedback system is a special form of pure feedback system. But its control design and performance analysis have a wide application background. This paper mainly studies the control design of single-input single-output nonlinear strict feedback system and its time-delay system. The main contents are as follows: 1. A class of nonlinear strict feedback system with single input and single output is studied. The adaptive fuzzy backstepping method is used to construct the system controller. The state of the system can not be measured directly. Therefore, the state observer is designed to estimate the state variables of the system. In order to reduce the estimation error of the system state variables, the fuzzy logic system is set up in the observer. By using convex combination and matrix inequality to solve the observation gain matrix, the problem that the observer design is inconsistent with the dynamic stability of observation error is solved. In this paper, the adaptive fuzzy control problem for a class of nonlinear strictly feedback time-delay systems is studied. The proposed design method of fuzzy adaptive output feedback control based on observer is further extended to nonlinear strictly feedback time-delay systems. In general. The corresponding fuzzy adaptive output feedback stabilization scheme is presented. Thirdly, the simulation of the two kinds of nonlinear systems is carried out.
【学位授予单位】：青岛大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TP273

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