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Proceedings Paper

Active vibration isolation by adaptive proportional control
Author(s): Yun-Hui Liu; Wei-Hao Wu; Chih-Liang Chu
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Paper Abstract

An active vibration isolation system that applies proportional controller incorporated with an adaptive filter to reduce the transmission of base excitations to a precision instrument is proposed in this work. The absolute vibration velocity signal acquired from an accelerator and being processed through an integrator is input to the controller as a feedback signal, and the controller output signal drives the voice coil actuator to produce a sky-hook damper force. In practice, the phase response of integrator at low frequency such as 2~5 Hz deviate from the 90 degree which is the exact phase difference between the vibration velocity and acceleration. Therefore, an adaptive filter is used to compensate the phase error in this paper. An analysis of this active vibration isolation system is presented, and model predictions are compared to experimental results. The results show that the proposed method significantly reduces transmissibility at resonance without the penalty of increased transmissibility at higher frequencies.

Paper Details

Date Published: 31 January 2013
PDF: 7 pages
Proc. SPIE 8759, Eighth International Symposium on Precision Engineering Measurement and Instrumentation, 875932 (31 January 2013); doi: 10.1117/12.2015206
Show Author Affiliations
Yun-Hui Liu, Southern Taiwan Univ. of Science & Technology (Taiwan)
Wei-Hao Wu, Southern Taiwan Univ. of Science & Technology (Taiwan)
Chih-Liang Chu, Southern Taiwan Univ. of Science & Technology (Taiwan)


Published in SPIE Proceedings Vol. 8759:
Eighth International Symposium on Precision Engineering Measurement and Instrumentation
Jie Lin, Editor(s)

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