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A Chattering Free Discrete-Time Global Sliding Mode Controller for Optoelectronic Tracking System

Author

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  • Yan Ren
  • Zhenghua Liu
  • Xiaodong Liu
  • Yu Zhang

Abstract

Aiming at the uncertainties including parameter variations and external disturbances in optoelectronic tracking system, a discrete-time global sliding mode controller (DGSMC) is proposed. By the design of nonlinear switching function, the initial state of control system is set on the switching surface. An adaptive discrete-time reaching law is introduced to suppress the high-frequency chattering at control input, and a linear extrapolation method is employed to estimate the unknown uncertainties and commands. The global reachability for sliding mode and the chattering-free property are proven by means of mathematical derivation. Numerical simulation presents that the proposed DGSMC scheme not only ensures strong robustness against system uncertainties and small tracking error, but also suppresses the high-frequency chattering at control input effectively, compared with the SMC scheme using conventional discrete-time reaching law.

Suggested Citation

  • Yan Ren & Zhenghua Liu & Xiaodong Liu & Yu Zhang, 2013. "A Chattering Free Discrete-Time Global Sliding Mode Controller for Optoelectronic Tracking System," Mathematical Problems in Engineering, Hindawi, vol. 2013, pages 1-8, November.
    • Handle: RePEc:hin:jnlmpe:951492
    DOI: 10.1155/2013/951492
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    Cited by:

    1. Paweł Latosiński & Katarzyna Adamiak, 2024. "Discrete-Time Sliding Mode Control Strategies—State of the Art," Energies, MDPI, vol. 17(18), pages 1-25, September.

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