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Sample entropy based prescribed performance control for tailless aircraft.

Zihou He1, Jianbo Hu1, Yingyang Wang1

  • 1Equipment Management and Unmanned Aerial Vehicle Engineering College, Air Force Engineering University, Xi'an, 710051, China.

ISA Transactions
|May 17, 2022
PubMed
Summary

This study introduces a novel Sample Entropy (SampEn)-based Prescribed Performance Controller (SPPC) for supersonic tailless aircraft. The SPPC enhances flight safety by detecting and mitigating control signal instability without precise model knowledge.

Keywords:
Prescribed performance controlSample entropyTailless aircraft

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Area of Science:

  • Aerospace Engineering
  • Control Systems Theory
  • Nonlinear Dynamics

Background:

  • Supersonic tailless aircraft present complex control challenges due to inherent model uncertainty and nonlinear dynamics.
  • Maintaining stable longitudinal control is critical for safe flight operations, especially under varying conditions.
  • Existing control methods may struggle with unpredictable signal behavior, potentially leading to loss of control.

Purpose of the Study:

  • To propose a novel Sample Entropy (SampEn)-based Prescribed Performance Controller (SPPC) for the longitudinal control of supersonic tailless aircraft.
  • To develop a SampEn-based Feedback Adjust System (SFAS) to identify and counteract dangerous signal chattering.
  • To demonstrate the controller's robustness against model uncertainty and nonlinearity without requiring adaptive or robust control mechanisms.

Main Methods:

  • Development of a SampEn-based Prescribed Performance Controller (SPPC) incorporating a SampEn-based Feedback Adjust System (SFAS).
  • Utilizing nonlinear error feedback for inherent robustness against model uncertainties.
  • Employing the backstepping technique for control structure design and closed-loop stability analysis.

Main Results:

  • The SPPC effectively identifies and adjusts for dangerous chattering in status signals, preventing potential loss of control.
  • The controller demonstrates robustness against model uncertainty and nonlinearity, outperforming traditional prescribed performance control (TPPC).
  • Closed-loop stability was rigorously proven through theoretical analysis and validated via high-fidelity simulations.

Conclusions:

  • The proposed SPPC offers a significant advancement in the longitudinal control of supersonic tailless aircraft, enhancing safety and performance.
  • The integration of SampEn provides a unique mechanism for detecting and mitigating instability.
  • The controller's model-free nature and demonstrated robustness make it a promising solution for real-world aerospace applications.