Page 5 - 《应用声学》2021年第3期

第 40 卷 第 3 期 Vol. 40, No. 3
2021 年 5 月 Journal of Applied Acoustics May, 2021

⋄ 研究报告 ⋄

声子晶体结构在功率超声换能器中的应用 ∗

胡理情 林书玉 †

(陕西师范大学 陕西省超声学重点实验室 西安 710119)

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。
关键词：二维声子晶体；超声换能器；前盖板；带隙；耦合振动
中图法分类号: O426.9 文献标识码: A 文章编号: 1000-310X(2021)03-0323-06
DOI: 10.11684/j.issn.1000-310X.2021.03.001

Application of phononic crystal structure in power ultrasonic transducer

HU Liqing LIN Shuyu

(Shaanxi Key Laboratory of Ultrasonics, Institute of Applied Acoustics, Shaanxi Normal University, Xi’an 710119, China)

Abstract: 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 quasi-
periodic 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.
Keywords: Two-dimensional phononic; Ultrasonic transducer; Front cover plate; Band gap; Coupled vibration

2020-08-10 收稿; 2020-12-03 定稿
国家自然科学基金项目 (11674206,11874253)
∗
作者简介: 胡理情 (1996– ), 女, 江西萍乡人, 硕士研究生, 研究方向: 功率超声。
† 通信作者 E-mail: sylin@snnu.edu.cn