非仿射非线性系统的自主构架模糊控制器

针对SISO非仿射非线性系统,提出一种新型自主构架模糊控制器.此控制器由鲁棒控制器与自主构架模糊系统构成.模糊系统初始只含有一条规则,根据系统误差和ε完备性2条准则自主增加规则及隶属函数,从而完善模糊系统结构,逼近非线性系统不确定量.模糊系统利用"伪模糊输出"法对新增规则后件初始化,考虑到实际计算能力,采用替换隶属函数机制限制规则数目.通过理论推导证明了系统的稳定性,理论和半实物仿真实验验证了所提出方法的有效性.

Self-structuring fuzzy controller for nonaffine nonlinear system

A self-structuring fuzzy controller(SFC) is proposed for the non-affine nonlinear SISO system. The controller consists of a robust controller and a self-structuring fuzzy system(SFS). The fuzzy system employed to approximate nonlinear system uncertainty has one rule initially. Two criteria are used for generating rules and membership functions, system error and ??-completeness. The new rules are initialized by using the “pseudo fuzzy output” method. And considering the practicalcomputing ability, an algorithm is proposed to replace the membership function, so that the number of rules never exceeds a predefined upper bound. The closed-loop stability is guaranteed. Theoretical simulation results and semi-physical simulation results show the effectiveness of the proposed approach.