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Output feedback adaptive control of a class of nonlinear discrete-time systems with unknown control directions and preceded by hysteresis

Hosseini Ardali, S. M ; Sharif University of Technology | 2015

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  1. Type of Document: Article
  2. DOI: 10.1080/00207179.2015.1046494
  3. Publisher: Taylor and Francis Ltd , 2015
  4. Abstract:
  5. This paper considers the output feedback adaptive controller design problem for a class of discrete-time nonlinear systems in output feedback form with unknown control directions and preceded by unknown hysteresis. The problem of lacking in a-priori knowledge on the control directions and unknown hysteresis are solved by using the discrete Nussbaum gain and Prandtl-Ishlinskii model, respectively. The system is transformed into the form of a nonlinear auto regressive moving average (NARMA) model to construct an output feedback control. To overcome the noncausal problem in the control design, future output prediction laws and parameter update laws with the dead-zone technique are constructed on the basis of the NARMA model. The proposed control algorithm guarantees that all the signals in the controlled system are bound and the output tracking error is made to be neighbourhood around zero, ultimately. Finally, simulations are performed on a nonlinear system to show the effectiveness of the proposed method
  6. Keywords:
  7. Adaptive control systems ; Algorithms ; Controllers ; Digital control systems ; Hysteresis ; Nonlinear feedback ; Nonlinear systems ; Discrete Nussbaum gain ; Discrete-time nonlinear systems ; Non-linear auto-regressive moving averages ; Nonlinear discrete-time systems ; Output feedback controls ; Output feedback forms ; Parameter update law ; Unknown control direction ; Discrete time control systems
  8. Source: International Journal of Control ; Volume 88, Issue 11 , Jun , 2015 , Pages 2412-2422 ; 00207179 (ISSN)
  9. URL: http://www.tandfonline.com/doi/full/10.1080/00207179.2015.1046494