A CRITERION FOR KNOWLEDGE-BASE DECOUPLING IN FUZZY-LOGIC CONTROL-SYSTEMS

In a coupled rule base, more than one condition variable may link with more than one action variable within the same rule. This paper develo ps an analytical framework for decoupling such a rule base, with speci fic reference to fuzzy-logic control. The computational problem of fuz zy-logic is greatly simplified through the use of an uncoupled rule ba se. Conditions are derived, under which, decision making through an un coupled rule base becomes equivalent to that through a coupled rule ba se. A laboratory prototype of a single-axis servo motor system which i ncorporates a knowledge-based tuner is employed to demonstrate the eff ective use of an uncoupled rule base that is equivalent to a coupled o ne.