基于滑模的模糊控制系统优化设计研究

Study on Optimal Design of Fuzzy Control System Based on Sliding Mode

针对两输入一输出的典型模糊控制器,模糊控制规则的选取主要依赖于该领域专家的先验知识和工人的操作经验,有较大的主观性,控制规则的设计缺乏形象的指导,用定量和定性的方法对典型的二阶模糊控制器的解析结构进行分析,特别是滑动模态变趋近律控制的思想对模糊控制规则进行形象的分析,并推导出模糊控制规则解析结构表达式,利用此方法可进行模糊控制规则的优化设计,仿真结果表明该方法具有良好的收敛性,使系统的动态性能得到明显的改善。

For a typical fuzzy controller with two inputs and one output, because the choice of rules depends on expert’s knowledge or operation experiences from workers, it is subjective. The design of fuzzy rules is short of graphic guidance. This paper makes a study on the optimal design of fuzzy-control rule through variable reaching law and gets the formulation of fuzzy-control rule. Both linguistic and numerical analyses show that FLC possesses properties of its linear control and sliding mode control. The simulation re-sult shows that the proposed algorithm is of good convergence and improves the dynamic characteristics of the control system.