access icon free Adaptive neural network tracking control for switched uncertain non-linear systems with actuator failures and time-varying delays

© The Institution of Engineering and Technology
Received 16/10/2018, Accepted 07/06/2019, Revised 30/04/2019, Published 07/06/2019

This study focuses on the problem of adaptive neural network (NN) tracking control for a class of strict-feedback non-linear switched systems under arbitrary switching. The considered systems are with unknown external disturbances, time-varying delays, and actuator failures. NNs are used to approximate unknown functions and Lyapunov–Karsovskii functionals are utilised to compensate for the time-varying delays. Different from the existing results, piecewise switched adaptive laws are proposed for each subsystem, which can reduce conservativeness caused by using common adaptive laws for all subsystems. Besides, prescribed performance bound (PPB) technique is developed to further improve the transient performance of the systems, especially when actuator failures occur and system switchings take place. Finally, under the framework of Lyapunov theory, an adaptive NN reliable tracking control method is proposed. It is proved that all the signals in the closed-loop system are semi-globally uniformly ultimately bounded and the tracking error remains within the PPBs. A simulation study is given to illustrate the effectiveness of the authors' results.

Inspec keywords: delays; Lyapunov methods; neurocontrollers; switching systems (control); uncertain systems; feedback; nonlinear control systems; adaptive control; actuators; position control; closed loop systems

Other keywords: strict-feedback nonlinear switched systems; arbitrary switching; common adaptive laws; closed-loop system; PPB technique; adaptive neural network tracking control; time-varying delays; adaptive NN reliable tracking control method; transient performance; actuator failures; prescribed performance bound; Lyapunov–Karsovskii functionals; tracking error; unknown external disturbances

Subjects: Stability in control theory; Time-varying control systems; Spatial variables control; Self-adjusting control systems; Neurocontrol; Nonlinear control systems; Actuating and final control devices; Distributed parameter control systems

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