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An Adaptive Regressor-Free Fourier Series-Based Tracking Controller for Robot Manipulators: Theory and Experimental Evaluation

Published online by Cambridge University Press:  17 February 2021

Jorge Villalobos-Chin*
Affiliation:
Tecnológico Nacional de México/Instituto Tecnológico de la Laguna, Apdo. Postal 49, Adm. 1, Torreón, Coahuila 27000, Mexico, E-mail: vsantiba@itlalaguna.edu.mx
Víctor Santibáñez
Affiliation:
Tecnológico Nacional de México/Instituto Tecnológico de la Laguna, Apdo. Postal 49, Adm. 1, Torreón, Coahuila 27000, Mexico, E-mail: vsantiba@itlalaguna.edu.mx
*
*Corresponding author. E-mail: jorgevillaloboschin@hotmail.com
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In this article, we propose a nonlinear Proportional+Derivative (PD) tracking controller with adaptive Fourier series compensation. The proposed controller uses a regressor-free adaptive scheme that relies on a trigonometric polynomial with varying coefficients to solve the control problem. Asymptotic convergence of the position and velocity errors is proven via a formal stability analysis based on Lyapunov and LaSalle theory for discontinuous systems. The proposed controller is validated on a 2-degrees of freedom robot manipulator. The experimental results validate the theoretically obtained results and reflect the effect of certain parameters in the transient behavior of the error dynamics. Certain robustness properties are also observed.

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© The Author(s), 2021. Published by Cambridge University Press