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Structured H∞ Control for Spacecraft with Flexible Appendages.

Yuntian Zhang1, Aiping Pang1,2, Hui Zhu1

  • 1College of Electrical Engineering, Guizhou University, Guiyang 550025, China.

Entropy (Basel, Switzerland)
|August 27, 2021
PubMed
Summary
This summary is machine-generated.

This study introduces a low-complexity structured H-infinity controller for flexible spacecraft. The novel controller effectively suppresses low-frequency vibrations in large appendages, improving pointing precision and stability.

Keywords:
flexible spacecraftprevent oscillationsstructured control

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Area of Science:

  • Aerospace Engineering
  • Control Systems Theory
  • Applied Mathematics

Background:

  • Spacecraft with large flexible appendages face low-frequency disturbances impacting operational performance.
  • High pointing precision, attitude stability, and bandwidth constraints are critical control design requirements.
  • Existing control methods may lack the complexity to address multiple performance criteria effectively.

Purpose of the Study:

  • To develop a low-complexity structured H-infinity controller for flexible spacecraft.
  • To address comprehensive control challenges including vibration suppression and performance criteria.
  • To reduce project cost and implementation difficulty for large flexible systems.

Main Methods:

  • Proposed a structured H-infinity control strategy with an internal mode controller, trap filter, and series PID controller.
  • Designed weighted functions for robustness, stability, and bandwidth limits.
  • Constructed a structured comprehensive performance matrix with decoupled outputs.

Main Results:

  • Developed a structured H-infinity controller meeting multiple performance requirements.
  • Demonstrated successful suppression of vibrations at 0.12 Hz and 0.66 Hz in a solar array example.
  • Achieved superior control performance compared to traditional H-infinity controllers.

Conclusions:

  • The proposed structured H-infinity controller offers a low-complexity, integrated solution for large flexible spacecraft.
  • This method is convenient for engineering practice and provides a theoretical basis for structured H-infinity control.
  • The controller effectively enhances pointing precision and suppresses resonant interference in flexible systems.