壓電元件於不同介質中的振動特性研究與實驗量測

Experimental Measurements and Theoretical Analysis on Dynamic Characteristics of Piezoelectric Components

林育志(Yu-Chih Lin)

指導教授 ： 馬劍清

國立臺灣大學/工學院/機械工程學研究所/博士(2004年)

https://doi.org/10.6342/NTU.2004.01190

摘要

壓電元件於不同介質中的
動態特性研究與實驗量測
摘要

由於壓電材料在感測、通訊、生醫以及航海、海底探勘、軍事防禦等方面的廣泛應用，因此壓電元件在各種介質中振動特性之分析乃十分重要的課題。因為水中振動分析時模態擷取較為困難，應用解析度與清晰度高的振幅變動電子斑點干涉術將使水中振動分析有所突破。
本論文將使用光學全域式的振幅變動電子斑點干涉術以及逐點式的雷射都卜勒振動儀和阻抗分析儀等三種實驗量測技術，並配合有限元素分析和理論解析針對壓電陶瓷圓盤以及其他較複雜幾何形狀之壓電陶瓷元件在空氣中與不同液體介質中的振動特性加以分析，以期能對於壓電元件更廣泛之應用與更深入的研究分析能有所助益。此外由於壓電陶瓷材料機械場與電場之耦合，改變披覆於其上之電極面形狀和大小將使機電耦合係數發生改變，因此本文也致力於探討不同電極設計對於壓電圓盤振動特性之影響。所有的實驗量測、理論解析以及數值分析結果都具有相當程度的一致性，對於壓電元件在不同介質中振動特性的了解有很大的幫助。

關鍵字

振動 ； 壓電陶瓷 ； 電子斑點干涉術

並列摘要

Experimental Measurements and Theoretical Analysis on Dynamic Characteristics of Piezoelectric Components
ABSTRACT
The investigation on the resonant characteristics of piezoelectric components both in the air and under liquids is very important because of the wide applications of piezoelectric material on sensor/actuator, communication, biomedical field, navigation, underwater exploration and national defense. Since it is difficult to get the mode shapes under liquids, the utilizing of AF-ESPI, which has the benefits of high resolution and clarity, can facilitate the under water resonant analysis.
In this dissertation, three experimental techniques, including AF-ESPI, LDV, and impedance analyzer, are adopted to obtain the vibration characteristics of piezoceramic components, such as disks, plates, composite laminates and bimorphs, in the air and under various liquids. The experimental results are compared with the FEM and analytical solutions. In addition, based on the coupling of mechanical and electrical fields of piezoelectric material, different designs of electrodes covered on the faces of the piezoelectric components will change the resonant characteristics of these components. The influences of electrode designs on resonant properties are also discussed in detail in this research. The results of the experimental and theoretical analysis are essentially in good agreement, and they provide complete information of the vibration characteristics of piezoelectric components in different kinds of media.

並列關鍵字

piezoelectric ； vibration ； ESPI

參考文獻

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