Active vibration isolation based on model reference adaptive control

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 fe...

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Bibliographic Details
Published inInternational journal of systems science Vol. 45; no. 2; pp. 97 - 108
Main Authors Liu, Lei, Tan, Kok Kiong, Guo, Yu, Cong, Ming, Lee, Tong Heng
Format Journal Article
LanguageEnglish
Published Taylor & Francis Group 01.02.2014
Subjects
Active control
active vibration isolation
Algorithms
composite control
Control systems
Control theory
Feedback
flexible spacecraft
Jitter
jitter attenuation
Model reference adaptive control
Stewart platform
Vibration
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Summary: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.
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ISSN:0020-7721
1464-5319
DOI:10.1080/00207721.2012.683834