带前置滤波器的MRAC系统的变结构控制  

Variable structure control for MRAC systems with feedforward filter

作　　者：武玉强[1] 余星火 冯纯伯[3] 

机构地区：[1]曲阜师范大学自动化研究所,山东曲阜273165 [2]墨尔本皇家理工学院计算机与电气工程系 [3]东南大学自动化研究所,江苏南京210096

出　　处：《控制理论与应用》2004年第2期200-204,210,共6页Control Theory & Applications

基　　金：国家自然科学基金项目(60174042;69934010);教育部高等学校骨干教师资助计划项目.

摘　　要：变结构控制对参数不确定性,外部干扰和未建模动态具有鲁棒性,并被应用到鲁棒模型参考自适应系统.其缺点是易产生抖振.本文设计一种带有前置滤波器的变结构控制器,改善系统动态性能并消除了抖振.前置滤波器使带有符号函数的控制切换产生连续可测信号,实际控制律是光滑的.控制器设计和不确定性估计中引入辅助信号和带有记忆功能的正规化信号,适当选取控制器参数,所设计的控制器保证了闭环系统稳定性和任意小的跟踪误差.仿真结果表明该算法是有效的.The variable structure control (VSC) scheme is robust to parameter uncertainty, external disturbance, and un-modeled dynamics, and it is widely applied to designing the robust model reference adaptive control (MRAC) systems. The main drawback of VSC is the phenomena of chattering. To improve system performance and to eliminate chattering, a new VSC with feedforward filter is designed in the paper. The proposed stable feedforward filter makes the control switching with sign functions to produce a continuous and measurable signal so that the actual control law is smooth. The auxiliary signals and normalized signals with memory functions are introduced to the controller design and the estimation of uncertainties. With a suitable choice of controller parameters, it is shown that even when the unmodeled dynamics exists, the proposed VSC guarantees the closed-loop global stability and arbitrary smallness of the tracking error. Simulation validates the proposed VSC scheme.

关 键 词：未建模动态 前置滤波器 变结构控制 全局稳定性 

分 类 号：TN713[电子电信—电路与系统]