Active vibration isolation based on model reference adaptive control |
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| Authors: | Lei Liu Kok Kiong Tan Yu Guo Ming Cong Tong Heng Lee |
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| Affiliation: | 1. Graduate School for Integrative Sciences and Engineering , National University of Singapore , 117456 Singapore , Singapore;2. Department of Electrical and Computer Engineering , National University of Singapore , 117586 Singapore , Singapore liuharbin@gmail.com;4. Department of Electrical and Computer Engineering , National University of Singapore , 117586 Singapore , Singapore;5. Faculty of Mechanical and Electrical Engineering , Kunming University of Science and Technology , Kunming 650093 , China;6. School of Mechanical Engineering , Dalian University of Technology , Dalian 116023 , China |
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| 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. |
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| Keywords: | active vibration isolation composite control jitter attenuation flexible spacecraft Stewart platform |
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