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Design and Application of a Fault Detection Method Based on Adaptive Filters and Rotational Speed Estimation for an Electro-Hydrostatic Actuator
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Robust prescribed-time observer-based sliding mode control: Theoretical design and flight control applications.

Wenhui Ma1, Shuangxi Liu2, Wei Huang2

  • 1School of Sciences, Xi'an Technological University, Xi'an 710021, China.

ISA Transactions
|October 17, 2025
PubMed
Summary

This study introduces a novel prescribed-time observer-based sliding mode control (PTSM) for nonlinear systems. The method ensures rapid and robust disturbance rejection and state convergence within a user-defined time frame.

Keywords:
Flight controlPrescribed–time controlPrescribed–time extended–state–observerRoll stabilizationSliding mode control

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Area of Science:

  • Control Theory
  • Nonlinear Systems
  • Observer Design

Background:

  • Nonlinear systems face challenges from external disturbances and internal dynamics.
  • Achieving precise and rapid state convergence is crucial for system performance.
  • Existing control methods may struggle with disturbance rejection and convergence time.

Purpose of the Study:

  • To develop a prescribed-time observer-based sliding mode control law for nonlinear systems.
  • To ensure disturbance compensation and state convergence within a user-defined time.
  • To address limitations of existing control strategies regarding convergence speed and robustness.

Main Methods:

  • Design of a prescribed-time extended-state observer (PTESO) using trigonometric-time-scaling.
  • Integration of PTESO with exponential-time-scaling for a PTSM control law.
  • Application and simulation of the control law for flight vehicle roll stabilization.

Main Results:

  • The PTESO achieves disturbance compensation in a pre-assigned time, independent of initial conditions.
  • The proposed PTSM control law guarantees precise state convergence within a specified time.
  • The control law effectively mitigates the peaking phenomenon.

Conclusions:

  • The PTESO-based PTSM control law offers superior prescribed-time convergence and robustness.
  • The developed method outperforms existing approaches in simulations.
  • The approach is validated through a practical flight control application.