Finite Time Adaptive Neural Dynamic Surface Control of Nonstrict Feedback Nonlinear Systems Including Dead-Zone and Full State Restrictions

• Published in: IEEE access Vol. 8; pp. 186699 - 186709
• Main Authors: Wu, Ziwen, Zhang, Tianping
• Format: Journal Article
• Language: English
• Published: Piscataway IEEE 2020; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Adaptive control; Backstepping; Control systems; dead-zone; Dynamic stability; dynamic surface control; Feedback control; Finite time adaptive control; full state constraints; Low pass filters; Lyapunov methods; Neural networks; Nonlinear control; Nonlinear dynamical systems; Nonlinear systems; nonstrict feedback systems; Tracking control; unmodeled dynamics
• ISSN: 2169-3536; 2169-3536
• DOI: 10.1109/ACCESS.2020.3030666

In this paper, finite time adaptive neural network (NN) tracking control is investigated for a class of uncertain nonstrict feedback systems with unknown dead-zone and unmodeled dynamics as well as full state restrictions. Using the linearized representation of dead-zone, finite-time adaptive control is presented by the aid of dynamic surface control (DSC) technique and the property of Gaussian function. By introducing logarithmic function as invertible nonlinear mapping, the full state restriction problem is solved. The dynamic signal generated by the low-pass filter is used to handle unmodeled dynamics. Through finite-time stability theory and introducing the bounded closed set in the proof, all the signals in the closed-loop system are proved to be semi-globally practical finite time stable (SGPFS). The restriction conditions are not triggered for all the states. Finally, two numerical examples are used to illustrate the feasiability of the finite time adaptive control strategy.