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Single Input Variable Universe Fuzzy Controller with Contraction-Expansion Factor for Inverted Pendulum in Real Time

Keywords: Contraction-expansion factor , inverted pendulum , single input fuzzy controller , variable universe.

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In Conventional Fuzzy Logic Controller (CFLC), input variables are the error (E) and the change-in-error (EC) regardless of the complexity of controlled plant. The rule table constructed for CFLC is two dimensional in input space. This two dimensional rule table can be reduced to single dimension by the signed distance method. This method also reduces the number of rules significantly. In this paper a fuzzy controller is designed with the signed distance input variable. Then to improve the performance of this controller the technique of variable universe of discourse is used. After using these two techniques simultaneous to design a fuzzy controller, it is implemented to stabilize inverted pendulum in real time.


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