非线性无线网络控制系统的切换模糊控制

Switched Fuzzy Control for Nonlinear Wireless Networked Control Systems

无线网络控制系统解决了一些特殊场合不便于线缆铺设的问题。从控制系统角度减小无线网络中随机延时对系统性能的影响,成为近年来研究的难点和热点之一。针对一类被控对象为非线性系统的无线网络控制系统中产生了随机延时,提出一种切换模糊控制方法。首先基于T-S模糊模型将对象线性化,设计求解不同延时下的最优状态反馈模糊控制器,再用网络传输延时作为切换信号,将闭环控制系统转化为一个切换模糊控制模型,通过切换模糊控制,实现对整体非线性系统的逼近与控制。最后通过实例验证了所提出方法的有效性。

Wireless networked control systems solve the problems in some special conditions without cables.How to decrease the impact of random delay in wireless network on system performance from the viewpoint of control becomes one of the difficult and hot research points of the wireless network control systems in recent years.Considering a class of wireless networked control systems with a nonlinear controlled object and combined with T-S fuzzy control theory and switched control system theory,a switched fuzzy control scheme was proposed.Firstly,based on T-S fuzzy model,the object was linearized,an optimal state feedback fuzzy controller was designed and solved under different time delays.Then network delay was used as switching law,and the closed loop networked control system can be converted into a switched fuzzy control model; the approach and control of the entire nonlinear system is established by the switched fuzzy control.Finally,a simulation example was given to demonstrate the effectiveness of the proposed method.