Funnel-based adaptive fuzzy finite-time control for non-affine nonlinear systems preceded by unknown actuators. (English) Zbl 1501.93081
Summary: In this paper, an adaptive finite-time funnel control for non-affine strict-feedback nonlinear systems preceded by unknown non-smooth input nonlinearities is proposed. The input nonlinearities include backlash-like hysteresis and dead-zone. Unknown nonlinear functions are handled using fuzzy logic systems (FLS), based on the universal approximation theorem. An improved funnel error surface is utilized to guarantee the steady-state and transient predetermined performances while the differentiability problem in the controller design is averted. Using the Lyapunov approach, all the adaptive laws are extracted. In addition, an adaptive continuous robust term is added to the control input to relax the assumption of knowing the bounds of uncertainties. All the signals in the closed-loop system are shown to be semi-globally practically finite-time bounded with predetermined performance for output tracking error. Finally, comparative numerical and practical examples are provided to authenticate the efficacy and applicability of the proposed scheme.
MSC:
| 93C40 | Adaptive control/observation systems |
| 93C42 | Fuzzy control/observation systems |
| 93D40 | Finite-time stability |
| 93C10 | Nonlinear systems in control theory |
| 93B52 | Feedback control |
Keywords:
adaptive finite-time funnel control; non-affine strict-feedback nonlinear systems; fuzzy logic systemsReferences:
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