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Fuzzy logic sliding mode control for command guidance law design.

Y Z Elhalwagy1, M Tarbouchi

  • 1Department of Electrical Engineering, R.G.&C., Military Technical College, Cairo, Egypt. Elhalwagy-y@rmc.ca

ISA Transactions
|April 22, 2004
PubMed
Summary

This study introduces a novel fuzzy sliding mode control for guidance systems, enhancing trajectory control and reducing system errors. The new method outperforms traditional sliding mode control in simulations, even with disturbances.

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Area of Science:

  • Control Systems Engineering
  • Aerospace Engineering
  • Intelligent Control Systems

Background:

  • Nonlinear and uncertain dynamical systems present significant control challenges.
  • Sliding mode control (SMC) and fuzzy logic are effective in handling system uncertainties.
  • Trajectory control in command guidance systems requires robust and precise algorithms.

Purpose of the Study:

  • To develop a combined sliding mode and fuzzy logic control scheme for trajectory control in a command guidance system.
  • To mathematically derive the acceleration command input for the guidance system.
  • To compensate for unmodeled dynamics and mitigate the chattering phenomenon inherent in SMC.

Main Methods:

  • A hybrid control strategy integrating sliding mode control (SMC) with fuzzy logic control (FLC) was developed.

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  • The controller was designed to manage the trajectory of a command guidance system.
  • Mathematical derivation of the acceleration command input was performed.

    • Main Results:

    • The proposed fuzzy sliding mode controller demonstrated robust performance against system parameter variations and external disturbances.
    • The controller effectively compensated for unmodeled dynamics and reduced chattering.
    • Simulations indicated superior performance compared to conventional SMC in various engagement scenarios.

    Conclusions:

    • The integration of fuzzy logic with sliding mode control offers a powerful approach for nonlinear dynamical systems.
    • The developed controller enhances the trajectory control accuracy and robustness of command guidance systems.
    • This hybrid approach presents a more effective missile guidance law than conventional SMC.