Stabilization of unstable and unintuitive plants by fuzzy control

A heuristically derived stabilization strategy for an unstable and unintuitive plant by fuzzy control is described, It is shown that the often-used classical fuzzy controller, which is both static and time-invariant, is incapable of stabilizing such types of plants, However, a simple modification to the classical fuzzy-controller architecture that separates the measurement and control phases, together with a hierarchical control strategy, enable the unstable and unintuitive plant to be stabilized, The fuzzy-control strategy, as well as the new fuzzy controller architecture, are based on the consideration of ''what a human subject would do when dealing with a physical plant which Is both unstable and unintuitive.'' The stabilization strategy is then generalized to other mathematically-similar systems. While the rules for the stabilization of the plant are heuristically defined, the membership functions associated,vith the rules are tuned by a simulated-annealing procedure.