Active vibration isolation based on model reference adaptive control

Lei Liu, Kok Kiong Tan, Yu Guo, Ming Cong and Tong Heng Lee

International Journal of Systems Science, 2014, vol. 45, issue 2, 97-108

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.

Date: 2014
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DOI: 10.1080/00207721.2012.683834

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