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Active vibration isolation based on model reference adaptive control

Author

Listed:
  • Lei Liu
  • Kok Kiong Tan
  • Yu Guo
  • Ming Cong
  • Tong Heng Lee

Abstract

High-performance instruments are very sensitive to vibrations and jitters. In this article, a new approach towards multi-degree-of-freedom (DOF) active vibration isolation and its application in spacecraft jitter suppression are presented. Model reference adaptive control (MRAC) with acceleration feedback is used to isolate random disturbances. However, a side effect of this algorithm is that displacements at low frequencies are amplified. Thus, the MRAC is augmented with proportional–integral–differential (PID) displacement feedback to suppress vibration displacements. The MRAC-PID composite control is applied to a 4-leg platform to isolate vibrations and suppress tip/tilt jitters. The scheme is also used to isolate 6-DOF vibrations and steer the payload of a flexible spacecraft. Satisfactory performance of vibration isolation and jitter attenuation has been observed.

Suggested Citation

  • Lei Liu & Kok Kiong Tan & Yu Guo & Ming Cong & Tong Heng Lee, 2014. "Active vibration isolation based on model reference adaptive control," International Journal of Systems Science, Taylor & Francis Journals, vol. 45(2), pages 97-108.
    • Handle: RePEc:taf:tsysxx:v:45:y:2014:i:2:p:97-108
    DOI: 10.1080/00207721.2012.683834
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