本文主要目的在探討壓電複合材料板的振動問題。振動問題一直是結構力學研究的課題之一，本文針對金屬-壓電型雙膜片圓盤致動器的振動來探討，首先以Kirchkoff-Love板的假設理論出發，最後找出系統的控制方程式，並對兩種不同的邊界條件來作討論。壓電複合材料板可以應用在許多方面，其中超音波馬達即為此一複合材料的應用，本文引用相關的文獻資料，介紹超音波馬達的種類及工作原理，並經由理論及有限元素分析來作討論。

This article discuss with the vibration of the piezoelectric composite plates and the basic analysis of the ultrasonic motors.The major section is about the methematical modal of the metal-piezo disk transducer.Finally,we use the F.E.M to analize the ultrasonic motors and introduce the kinds and history of the ultrasonic motors.

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