一类非线性系统的全局鲁棒模糊时变滑模控制

The global robustness fuzzy time-varying sliding mode control for a class of nonlinear system

针对参数不确定性非线性系统 ,将模糊逻辑控制引入时变滑平面的设计方法中 ,提出了一种具有全局鲁棒性的模糊时变滑模控制方法 ,保证控制系统从初始时刻开始就处于滑动模态上 ,消除了到达段 ,从而保证了系统对外部摄动及参数变化的全局鲁棒性 ;同时 ,用模糊控制替代符号函数 ,并推导出了模糊滑模控制器的解析式 ,使得控制信号平滑 ,消除了系统的高频颤动。

Ascheme of global robustness fuzzy time_varying sliding mode control for a class of nonlinear system with unˉcertainties is proposed ing this paper.Since the proper fuzzy logic control is applied to the time_varying sliding surface,the state of the control system always lies on the sliding surface fron the beginning of any initial state and is robust to the parameter variations and disturbance.Chattering can also be avoided by fuzzy tuning of the controller.The simulation reˉsults verify its efficacy and supriority.