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Output Feedback Adaptive Fractional-Order Super-Twisting Sliding Mode Control of Robotic Manipulator

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Iranian Journal of Science and Technology, Transactions of Electrical Engineering Aims and scope Submit manuscript

Abstract

In this study, trajectory tracking of robotic manipulators with uncertainties and external disturbances is obtained by proposing model-free adaptive fractional super-twisting sliding mode control (AOFSTSM). The proposed AOFSTSM method is composed of an adaptive super-twisting sliding mode control integrated with fractional-order (FO) control. An adaptive tuning control is utilized to evaluate the uncertain unknown dynamics of the system without relying on the prior knowledge of the upper bounds. Moreover, FO control and super-twisting sliding mode control are used to achieve the fast finite-time convergence, chatter-free control inputs, better tracking performance and robustness. An output feedback (OF) is proposed and the state estimation is obtained by robust exact differentiator. Furthermore, the stability of the overall system is investigated and derived from the Lyapunov stability criterion. Finally, to validate the effectiveness and robustness of the developed control method, comparative simulations of state-feedback and OF of proposed method with fractional-order nonsingular fast terminal sliding mode control are realized to demonstrate the performance of AOFSTSM.

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Authors and Affiliations

  1. Department of Mechatronics, Shaheed Zulfikar Ali Bhutto Institute of Science and Technology (SZABIST), Karachi, Pakistan

    Saim Ahmed, Aneel Ahmed, Ismail Mansoor, Faraz Junejo & Atif Saeed

Authors
  1. Saim Ahmed
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  2. Aneel Ahmed
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  3. Ismail Mansoor
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  4. Faraz Junejo
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  5. Atif Saeed
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Correspondence to Saim Ahmed.

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Ahmed, S., Ahmed, A., Mansoor, I. et al. Output Feedback Adaptive Fractional-Order Super-Twisting Sliding Mode Control of Robotic Manipulator. Iran J Sci Technol Trans Electr Eng 45, 335–347 (2021). https://doi.org/10.1007/s40998-020-00364-y

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  • DOI: https://doi.org/10.1007/s40998-020-00364-y

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