Technical Notes and Correspondence
International Journal of Control, Automation and Systems 2010; 8(4): 903-907
Published online August 3, 2010
https://doi.org/10.1007/s12555-010-0425-z
© The International Journal of Control, Automation, and Systems
Indirect Adaptive Fuzzy Control for a Class of Nonaffine Nonlinear Systems with Unknown Control Directions
This article presents an indirect adaptive fuzzy control scheme for a class of nonlinear uncertain nonaffine systems with unknown control directions. The nonlinear nonaffine system is first transformed into an affine form by using a Taylor series expansion, and then fuzzy systems are em-ployed to approximate the equivalent affine system’s unknown nonlinearities. By modifying the esti-mated input control gain and using a novel smooth robust control term, a stable well-defined adaptive controller is proposed. Simulation results are provided to illustrate the efficiency of the proposed scheme.
Keywords Adaptive control, fuzzy control, nonaffine systems, unknown control direction.
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Technical Notes and Correspondence
International Journal of Control, Automation and Systems 2010; 8(4): 903-907
Published online August 1, 2010 https://doi.org/10.1007/s12555-010-0425-z
Copyright © The International Journal of Control, Automation, and Systems.
Indirect Adaptive Fuzzy Control for a Class of Nonaffine Nonlinear Systems with Unknown Control Directions
Salim Labiod and Thierry Marie Guerra
University of Jijel, Algeria
Abstract
This article presents an indirect adaptive fuzzy control scheme for a class of nonlinear uncertain nonaffine systems with unknown control directions. The nonlinear nonaffine system is first transformed into an affine form by using a Taylor series expansion, and then fuzzy systems are em-ployed to approximate the equivalent affine system’s unknown nonlinearities. By modifying the esti-mated input control gain and using a novel smooth robust control term, a stable well-defined adaptive controller is proposed. Simulation results are provided to illustrate the efficiency of the proposed scheme.
Keywords: Adaptive control, fuzzy control, nonaffine systems, unknown control direction.
Vol. 23, No. 3, pp. 683~972
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