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Vibration and acoustic radiation characteristics of cylindrical piezoelectric transducers with circumferential steps
Journal of Sound and Vibration ( IF 4.7 ) Pub Date : 2021-07-09 , DOI: 10.1016/j.jsv.2021.116346
Ata Meshkinzar 1 , Ahmed M Al-Jumaily 1
Affiliation  

Circular cylindrical transducers have a wide range of applications in ultrasound generation. Introducing axial or circumferential stepped-thickness variations affects the performance of these transducers. This paper investigates the effect of circumferential stepped-thickness variations on the vibration and acoustic characteristics of a circular cylindrical piezoelectric shell. FEM software ANSYS is used to simulate these characteristics and experiments are performed to validate the simulations. Stress concentration levels due to these steps are observed in order to avoid exceeding the material limit. The results show that these steps can excite certain mode shapes which produce strong ultrasound fields and these modes have circumferential wave numbers commensurate with the number of stepped regions. These steps localize the vibration within the thin-walled regions leading to higher amplitude acoustic waves produced by constructive interference. Superiority of a circumferentially stepped transducer over an axially stepped one is demonstrated in this study through a much more uniform acoustic field along the length of the transducer as well as a lower frequency of operation at the intended mode shape. The effect of input excitation is also investigated and it is shown that introducing circumferential steps is more effective in terms of acoustic amplification than increasing the input excitation for the uniform-thickness transducer.



中文翻译:

具有圆周台阶的圆柱形压电换能器的振动和声辐射特性

圆柱形换能器在超声波生成中具有广泛的应用。引入轴向或周向阶梯式厚度变化会影响这些换能器的性能。本文研究了圆周台阶厚度变化对圆柱形压电壳的振动和声学特性的影响。FEM 软件 ANSYS 用于模拟这些特性,并进行实验以验证模拟。观察由于这些步骤引起的应力集中水平,以避免超出材料限制。结果表明,这些台阶可以激发产生强超声场的某些模式形状,并且这些模式具有与台阶区域数量相称的圆周波数。这些步骤将振动定位在薄壁区域内,导致相长干涉产生更高振幅的声波。本研究通过沿换能器长度方向更均匀的声场以及在预期模式形状下的较低工作频率证明了圆周阶梯式换能器优于轴向阶梯式换能器。还研究了输入激励的影响,结果表明,就声学放大而言,引入圆周台阶比增加均匀厚度换能器的输入激励更有效。本研究通过沿换能器长度方向更均匀的声场以及在预期模式形状下的较低工作频率证明了圆周阶梯式换能器优于轴向阶梯式换能器。还研究了输入激励的影响,结果表明,就声学放大而言,引入圆周台阶比增加均匀厚度换能器的输入激励更有效。本研究通过沿换能器长度方向更均匀的声场以及在预期模式形状下的较低工作频率证明了圆周阶梯式换能器优于轴向阶梯式换能器。还研究了输入激励的影响,结果表明,就声学放大而言,引入圆周台阶比增加均匀厚度换能器的输入激励更有效。

更新日期:2021-07-15
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