以On-Off切換控制提高壓電結構阻尼的研究

Improvement of Piezoelectric Structural Damping by On-Off Switch Control

何信宗(Shine-Tzong Ho) ； 黃裕方(Yu-Fang Huang) ； 董澤昱(Ze-Yu Dong)

《中華民國振動與噪音工程學會論文集》 2014 (2014/06) Pp. 114-118

摘要

在本研究中，對壓電結構進行了被動與半主動的振動控制，比較兩種控制方法所造成的振動消除效果，並比較其產生的系統阻尼值。在被動控制中，使用了電阻與壓電電容產生共振形成阻尼效果。在半主動控制中，壓電片電極被開關保持為開路，直到機械位移到達極值，此時壓電片電極會被切換到短路，以消除壓電電極兩端的電壓，透過切換控制促成電能消耗進而增進阻尼效果。在實驗方面，相對於未受控制的壓電結構振動量，使用最佳阻抗值的被動控制所消除的振動量約為4.39dB，而半主動控制所消除的振動量約為8.35dB。以暫態振動響應估算壓電結構的系統阻尼比得知，未受控制時的阻尼比約為0.21%，使用最佳阻抗值的被動控制的阻尼比約為0.313%，使用半主動控制的阻尼比約為0.555%。

關鍵字

壓電結構 ； 切換控制 ； 減振 ； 阻尼比估算

並列摘要

In this paper, passive control and semi-active control are used for vibration suppression of piezoelectric structure. And the resulted system damping values are compared. In the passive control, a single resistor electrically resonant with the piezoelectric capacitor exhibits a damping efficiency. In semi-active control, the switch is keeping the piezoelectric electrodes on an open circuit until a local extreme of mechanical displacement occurs. The piezoelectric electrodes are then briefly switched to a short circuit to quickly cancel the voltage across its electrodes. The damping results from the electrical energy dissipated through switching control. In experiments, the passive control of the optimal resistance achieved 4.39 dB and the semi-active control achieved 8.35dB vibration suppression. The damping ratios were estimated by the transient vibration response of the piezoelectric structure. The damping ratios were about 0.21%, 0.313%, and 0.551% for the uncontrolled, the passive control, and the semi-active control respectively.

並列關鍵字

Piezoelectric structure ； Switching control ； Vibration damping ； Damping ratio estimate