Active vibration isolation by adaptive proportional control

Yun-Hui Liu; Wei-Hao Wu; Chih-Liang Chu

doi:10.1117/12.2015206

31 January 2013 Active vibration isolation by adaptive proportional control

Yun-Hui Liu, Wei-Hao Wu, Chih-Liang Chu

Proceedings Volume 8759, Eighth International Symposium on Precision Engineering Measurement and Instrumentation; 875932 (2013) https://doi.org/10.1117/12.2015206
Event: International Symposium on Precision Engineering Measurement and Instrumentation 2012, 2012, Chengdu, China

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.

Citation Download Citation

Yun-Hui Liu, Wei-Hao Wu, and Chih-Liang Chu "Active vibration isolation by adaptive proportional control", Proc. SPIE 8759, Eighth International Symposium on Precision Engineering Measurement and Instrumentation, 875932 (31 January 2013); https://doi.org/10.1117/12.2015206

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