声子晶体结构在功率超声换能器中的应用  

Application of phononic crystal structure in power ultrasonic transducer

作　　者：胡理情 林书玉[1] HU Liqing;LIN Shuyu(Shaanxi Key Laboratory of Ultrasonics,Institute of Applied Acoustics,Shaanxi Normal University,Xi’an 710119,China)

机构地区：[1]陕西师范大学陕西省超声学重点实验室,西安710119

出　　处：《应用声学》2021年第3期323-328,共6页Journal of Applied Acoustics

基　　金：国家自然科学基金项目(11674206,11874253)。

摘　　要：该文提出了一种二维声子晶体结构模型,并将该模型应用于横向尺寸较大的功率超声换能器的前盖板中,避免了形成耦合振动对换能器的影响,从而优化了该类换能器的工作性能。首先设计了一种具有近周期性结构的圆柱形孔的前盖板,然后研究了声子晶体结构前盖板散射体的半径大小和高度对换能器共振频率以及前盖板带隙的影响。结果表明,随着散射体半径和高度的增大,换能器的共振频率会随之发生改变,带隙范围也在发生变化,可以通过调节使换能器的共振频率处于声子晶体的带隙范围内,可以有效抑制换能器的横向振动。A two-dimensional phononic crystal structure model is proposed and applied in power ultrasonic transducer with large transverse dimensions in this paper,which avoids the influence of coupling vibration on the transducer and optimizes its performance.Firstly,the front cover plate with cylindrical hole of quasiperiodic structure is designed,then the influence of the radius and height of the scatterer on the resonant frequency and band gap of the phononic crystal structure is studied.The research shows that with the increase of the radius and height of the scatterer,the resonant frequency of the transducer is changed accordingly,and the band gap range is also changed.The resonant frequency of the transducer can be adjusted to be within the band range of the phononic crystal,which can effectively suppress the transverse vibration of the transducer.

关 键 词：二维声子晶体 超声换能器 前盖板 带隙 耦合振动 

分 类 号：O426.9[理学—声学]