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Adaptive neural novel prescribed performance control for non-affine pure-feedback systems with input saturation
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Adaptive neural novel prescribed performance control for non-affine pure-feedback systems with input saturation
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Adaptive neural novel prescribed performance control for non-affine pure-feedback systems with input saturation
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Journal Article
Adaptive neural novel prescribed performance control for non-affine pure-feedback systems with input saturation
2018
Overview
An error constraint control problem is considered for pure-feedback systems with non-affine functions being possibly in-differentiable. A new constraint variable is used to construct virtual control that guarantees the tracking error within the transient and steady-state performance envelopment. The new error transformation avoids non-differentiable problems and complex deductions caused by traditional error constraint approaches. A locally semi-bounded and continuous condition for non-affine functions is employed to ensure the controllability and transform the closed-loop system into a pseudo-affine form. An auxiliary system with bounded compensation term is proposed for nonlinear systems with input saturation. On the basis of backstepping technique, an adaptive neural controller is designed to handle unknown terms and circumvent repeated differentiations of virtual controls. The boundedness and convergence of the closed-loop system are proved by Lyapunov theory. Asymptotic tracking is achieved without violating control input constraint and error constraint. Two examples are performed to verify the theoretical findings.
