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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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Fixed-time fault-tolerant attitude control for flexible spacecraft without angular velocity sensor.

Muhammad Noman Hasan1, Yong Chen2, Jiongjiong Liang1

  • 1Yangtze Delta Region Institute of University of Electronic Science and Technology (UESTC), Huzhou, Zhejiang, 313001, China.

ISA Transactions
|December 21, 2023
PubMed
Summary

This study presents a novel fixed-time fault-tolerant attitude control system for flexible spacecraft, achieving precise control and vibration suppression using only attitude data, even with actuator failures.

Keywords:
Angular velocity sensorFault-tolerant attitude controlFixed-timeFlexible spacecraft

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Area of Science:

  • Aerospace Engineering
  • Control Systems Theory
  • Robotics

Background:

  • Spacecraft attitude control is critical for mission success.
  • Flexible spacecraft dynamics introduce complexities like vibrations.
  • Actuator faults and external disturbances pose significant challenges.

Purpose of the Study:

  • To develop a fixed-time fault-tolerant attitude control strategy for flexible spacecraft.
  • To achieve attitude control and vibration suppression using only attitude information.
  • To ensure robustness against parametric variations, disturbances, and actuator faults.

Main Methods:

  • Designed an adaptive fixed-time model-free observer (AFTMFO) for angular velocity estimation.
  • Synthesized a novel adaptive continuous control using an anti-unwinding fast fixed-time nonsingular sliding surface (AFFTNSS).
  • Employed Lyapunov techniques to ensure closed-loop stability.

Main Results:

  • Achieved velocity sensor-free fixed-time attitude maneuvering with high pointing accuracy.
  • Demonstrated effective vibration suppression of flexible appendages.
  • Showcased fault tolerance and chattering-free control with improved convergence speed.

Conclusions:

  • The proposed control scheme provides robust, fixed-time fault-tolerant attitude control for flexible spacecraft.
  • It effectively suppresses vibrations without additional sensors.
  • The method offers superior performance and reduced control effort compared to existing approaches.