An Adaptive Fuzzy Dead-Zone Compensation Scheme and its Application to Electro-Hydraulic Systems

作者：Bessa Wallace M^*; Dutra Max S; Kreuzer Edwin

来源：Journal of the Brazilian Society of Mechanical Sciences and Engineering, 2010, 32(1): 1-7.

DOI：10.1590/S1678-58782010000100001

• adaptive algorithms
• dead-zone
• electro-hydraulic actuators
• fuzzy logic
• nonlinear control

The dead-zone is one of the most common hard nonlinearities in industrial actuators and its presence may drastically compromise control system stability and performance. Due to the possibility to express specialist knowledge in an algorithmic manner, fuzzy logic has been largely employed in the lost decades to both control and identification of uncertain dynamical systems. In spite of the simplicity of this heuristic approach, in some situations a more rigorous mathematical treatment of the problem is required. In this work, an adaptive fuzzy controller is proposed for nonlinear systems subject to dead-zone input. The boundedness of all closed-loop signals and the convergence properties of the tracking error are proven using Lyapunov stability theory and Barbalat's lemma. An application of this adaptive fizzy scheme to an electro-hydraulic servo-system is introduced to illustrate the controller design method. Numerical results are also presented in order to demonstrate the control system performance.

• 出版日期2010-3