運用適應性訊號處理於六自由度主動隔振系統之實現

Implementation of Six-DOF Active Vibration Isolation by Adaptive Signal Processing

謝宏恩(Hung-En Hsieh) ； 吳偉豪(Wei-Hao Wu) ； 劉雲輝(Yun-Hui Liu)

《應用聲學與振動學刊》 7卷1期 (2015/06) Pp. 1-11

https://doi.org/10.6282/JASV.2015.7.1.01

摘要

本研究使用適應性訊號處理與比例控制器，針對隔振系統自然頻率之振動進行主動控制，輸入訊號採用自製加速規量得加速度訊號後經積分器積分獲得之速度訊號，再由控制器運算並輸出控制訊號，驅動音圈致動器抑制自然頻率振動。由於加速度訊號經過積分器積分後之速度訊號會與原加速度訊號有相位誤差的問題，因此本研究採用適應性訊號處理技術，進行相位誤差的修正，經由實驗證明可行。本實驗架構之被動式隔振系統平臺上振動量僅達到VC-B之振動規範。運用適應性比例控制器對隔振平臺進行主動控制實驗，實驗結果顯示控制後自然頻率之振動傳遞率，垂直軸向從16 dB降為-5.68 dB，水平軸向從15 dB降為2.81 dB，平臺振動量符合VC-E之振動規範。

關鍵字

主動隔振控制 ； 適應性訊號處理 ； 天勾式阻尼器

並列摘要

n active vibration control system that applies proportional controller incorporated with an adaptive filter to reduce the resonance of the passive isolator at natural frequency 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 outputsignal drives the voice coil actuator to produce a skyhook 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 vertical axis resonance from 16 dB to -5.68 dB, and at horizontal axis resonance from 15 dB to 2.81 dB without the penalty of increased transmissibility at higher frequencies.

並列關鍵字

Active Vibration Control ； Adaptive Signal Processing ； Sky-Hook Damper