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A modeling technique for active control design studies with application to spacecraft microvibrations.

G S Aglietti1, S B Gabriel, R S Langley

  • 1Department of Aeronautics and Astronautics, University of Southampton, England.

The Journal of the Acoustical Society of America
|September 7, 2001
PubMed
Summary

This study presents a new modeling technique to reduce spacecraft microvibrations using active control systems. The method effectively minimizes structural vibrations for sensitive payloads.

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Area of Science:

  • Aerospace Engineering
  • Mechanical Engineering
  • Control Systems

Background:

  • Spacecraft equipment generates microvibrations (1-1000 Hz) that can impact sensitive payload performance.
  • Effective active control strategies require realistic and simplified structural models of electromechanical systems.

Purpose of the Study:

  • To present a novel modeling technique for spacecraft structures susceptible to microvibrations.
  • To develop and evaluate active control strategies for minimizing structural dynamic disturbances.
  • To provide a basis for in-depth controller design and evaluation studies.

Main Methods:

  • Utilized Lagrange's equation with vibration mode shapes as Ritz functions to derive equations of motion.
  • Employed piezoelectric patches as sensors and actuators on a mass-loaded panel model.

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  • Transformed equations into state variables for controller design using optimal control theory and a state observer.

    • Main Results:

    • Developed a feasible and realistic mathematical model for spacecraft structural dynamics.
    • Demonstrated the effectiveness of the proposed modeling technique for active vibration control.
    • Showcased initial results from active control strategy studies targeting displacement minimization.

    Conclusions:

    • The presented modeling technique is a viable and realistic approach for spacecraft vibration control.
    • The methodology supports the design and evaluation of advanced active control systems.
    • This work provides a foundation for further research in mitigating microvibration effects in space missions.