壓電超音波變幅桿設計與模擬分析

Design of a Piezoelectric Ultrasonic Horn Shape and Its Simulation

丁冠彰(Guan-Zhang Ding) ； 黃宜正(Yi-Cheng Huang)

《應用聲學與振動學刊》 4卷2期 (2012/12) Pp. 23-33

https://doi.org/10.6282/JASV.2012.4.2.03

摘要

超音波的高頻振動是由壓電振動子將高週波電能轉換為機械能所產生，由於壓電振動子所輸出的位移量很小，因此，需要藉由連結變幅桿來放大壓電振動子的振幅，而超音波變幅桿設計的好壞會嚴重影響到振幅的放大效果，因此本文先以實驗方式量測壓電振動子的輸出振動頻率，再依此作為變幅桿的共振頻率，並將其分為兩部分做探討。先以理論基礎設計出所需之變幅桿尺寸及形狀，再與ANSYS模擬做比較，結果顯示模態頻率誤差為0.6%，放大率誤差為0.8%，兩者誤差皆在1%以內，經由有限元素分析可快速精準達到研發的目的。

關鍵字

變幅桿 ； ANSYS ； 壓電振動子 ； 模態分析 ； 簡諧分析

並列摘要

The principle of a piezoelectric transducer is to transfer the high frequency of electrical energy to mechanical energy. Because the output displacement of piezoelectric transducer is too small, the need to amplify the displacement of the tool is based on the design of horn shape. This paper is first to conduct experiment to measure the vibration frequency and amplitude of the piezoelectric transducer. According to the experiment result, the resonant frequency of the horn is defined thereafter. Theoretical calculation and ANSYS simulation are conducted for the geometrical shape of the piezoelectric actuated horn. Result for modal frequency simulation error is 0.6%. The amplification factor for horn shape harmonics error is 0.8%. Both of the modal frequency and harmonics analysis via the ANSYS simulation reach the error less than 1%. Simulation results can be used for knowing the requirement of tool displacement of the horn in the future application.

並列關鍵字

Horn ； ANSYS ； Piezoelectric Transducer ； Modal Analysis ； Harmonic Analysis