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وزارة التعليم العالي و البحث العلمي

Research centre in Industrial Technologies -CRTI- EChahid Mohammed ABASSI

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Practical finite-time fuzzy control of uncertain nonstrict-feedback systems with actuator saturation and output constraints

Type: Journal Article
Publication year: 2024
Domain: Automation
Journal name: International Journal of Adaptive Control and Signal Processing
Authors: Mohammed Haddad, Abdesselem Boulkroune, Hongyi Li
Keywords
fuzzy adaptive controllerfuzzy disturbance observer input and output constraintsuncertain nonstrict-feedback system
Abstract

This article investigates the devise issue of a practical finite-time output-tracking control for uncertain nonlinear nonstrict-feedback systems subject simultaneously to time-varying output constraints (TVOC), actuator saturation, and bounded unmatched disturbances. An adaptive fuzzy approximator-based control system is devised using the dynamic surface control (DSC) concept. System output constraints are addressed by employing an appropriate barrier Lyapunov function. Adaptive fuzzy disturbance observers are constructed to practically deal with time-varying unmatched but bounded disturbances. It is verified via Lyapunov stability analysis and simulation experiments that all closed-loop signals remain bounded, the output tracking error practically converges in finite time to a tiny but adjustable neighborhood around the origin, and the system output stays within its required time-varying bounds.