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Stable adaptive fuzzy control of nonlinear systems

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1 Author(s)
Wang, L.-X. ; Dept. of Electr. Eng. & Comput. Sci., California Univ., Berkeley, CA, USA

A direct adaptive fuzzy controller that does not require an accurate mathematical model of the system under control, is capable of incorporating fuzzy if-then control rules directly into the controllers, and guarantees the global stability of the resulting closed-loop system in the sense that all signals involved are uniformly bounded is developed. The specific formula for the bounds is provided, so that controller designers can determine the bounds based on their requirements. The direct adaptive fuzzy controller is used to regulate an unstable system to the origin and to control the Duffing chaotic system to track a trajectory. The simulation results show that the controller worked without using any fuzzy control rules, and that after fuzzy control rules were incorporated the adaptation speed became much faster. It is shown explicitly how the supervisory control forces the state to remain within the constraint set and how the adaptive fuzzy controller learns to regain control

Published in:

Fuzzy Systems, IEEE Transactions on  (Volume:1 ,  Issue: 2 )