Fuzzy-enhanced Adaptive Control for Flexible Drive System with Friction Using Genetic Algorithms

  • Authors:
  • Lih-Chang Lin;Ywh-Jeng Lin

  • Affiliations:
  • Department of Mechanical Engineering, National Chung Hsing University, Taichung, Taiwan 402, R.O.C.;Department of Mechanical Engineering, National Chung Hsing University, Taichung, Taiwan 402, R.O.C.

  • Venue:
  • Journal of Intelligent and Robotic Systems
  • Year:
  • 1998

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Abstract

When a mechatronic system is in slow speed motion, serious effect ofnonlinear friction plays a key role in its control design. In this paper, astable adaptive control for drive systems including transmission flexibilityand friction, based on the Lyapunov stability theory, is first proposed. Forease of design, the friction is fictitiously assumed as an unknowndisturbance in the derivation of the adaptive control law. Geneticalgorithms are then suggested for learning the structure and parameters ofthe fuzzy-enhancing strategy for the adaptive control to improvesystem’s transient performance and robustness with respect touncertainty. The integrated fuzzy-enhanced adaptive control is well testedvia computer simulations using the new complete dynamic friction modelrecently suggested by Canudas de Wit et al. for modeling the real frictionphenomena. Much lower critical velocity of a flexible drive system thatdetermines system’s low-speed performance bound can be obtained usingthe proposed hybrid control strategy.