一类不确定切换模糊系统的自适应鲁棒跟踪控制  

Adaptive Robust Tracking Control for a Class of Uncertain Switched Fuzzy Systems

作　　者：张乐[1] 杨红[2] 井元伟[1] 

机构地区：[1]东北大学信息科学与工程学院,辽宁沈阳110004 [2]沈阳大学信息工程学院,辽宁沈阳110044

出　　处：《东北大学学报（自然科学版）》2008年第8期1073-1076,共4页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(60574013)

摘　　要：提出了一类新的不确定切换模糊系统,即切换系统中的每个子系统都是不确定模糊系统.与传统的模糊切换系统不同,这类系统并没有分为两级结构,而是由多个子系统构成,并在子系统之间进行切换.采用多Lyapunov函数研究不确定切换模糊系统的鲁棒跟踪问题,针对模型中未知上界的外部干扰,设计全局鲁棒控制器及其自适应律,并给出使该系统的跟踪误差一致渐近趋于零的切换策略.仿真表明,当自适应参数的在线慢调节与切换律的在线快调节相结合时,能提高系统的暂态响应性能.Presents a new uncertain switched fuzzy system in which all subsystems are fuzzily uncertain. Differing from the conventional switching fuzzy systems which are all of two-level architecture, the new system consists of several subsystems and they switch on/off each other. Studies the robust tracking control of uncertain switched fuzzy systems by multi-Lyapunov functions. Taking account of the external disturbance whose upper bounds are unknown, the global robust controller and its adaptive law are designed with the relevant switching strategy given to enable the tracking error of the system to approach to zero uniformly asymptotically. Simulation indicates that the transient response of the system is improved when combining the slow adjustment of adaptive parameters with quick adjustment of switching law.

关 键 词：切换模糊系统 多LYAPUNOV函数 切换律 鲁棒跟踪控制 自适应控制 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]