柱形压电超声换能器的耦合振动和声场分析(英文)  

The coupled vibration and acoustic field of a composite piezoelectric ultrasonic transducer

作　　者：张小丽[1] 林书玉[1] 付志强[1] 王勇[1] 胡文旭[1] 

机构地区：[1]陕西师范大学应用声学研究所,西安710062

出　　处：《南京大学学报（自然科学版）》2012年第5期537-543,共7页Journal of Nanjing University（Natural Science）

基　　金：National Natural Science Foundation of China(11174192)

摘　　要：本文提出了一种新型的柱形压电超声换能器,其结构包含:夹心式纵向压电换能器,大尺寸各向同性空心圆柱体及前、后盖板.基于表观弹性法,通过引入等效弹性常数及等效机电耦合系数,得出了空心圆柱的等效电路.根据近似解析法,研究了该换能器的耦合振动情况,并给出了其机电等效电路及共振频率方程.利用有限元软件ATILA模拟了该换能器的振动位移分布及声场分布,可以看出该换能器能够产生纵向和径向超声.从分析结果可以看出,两种方法具有很好的一致性.该耦合振动换能器为超声波液体处理系统提供了参考.This paper presents a new type of composite piezoelectric ultrasonic transducer,composed of a sandwich longitudinal piezoelectric transducer,an isotropic metal hollow cylinder with large radial dimension,and the front and back metal radiation masses.Based on the apparent elasticity method,by introducing equivalent elastic constants and equivalent mechanical coupling coefficient,the equivalent circuit of the hollow cylinder is obtained.The coupled vibration of the composite transducer is studied by using an approximate analytic method.The electro-mechanical equivalent circuit and the resonance frequency equation of the composite transducer are derived analytically.The vibrational displacement distribution and the radiation sound field of the composite transducer are simulated with finite element software ATILA.It can be seen that the coupled vibration can generate ultrasound in both axial and radial directions.Their resonance frequencies are compared with the analytical and numerical results,which show that the results from these two methods are in a good agreement with each other.It is expected that the composite ultrasonic transducer with coupled vibration can be used in more and more liquid processings.

关 键 词：柱形压电超声换能器 耦合振动 共振频率 声场 

分 类 号：TB552[理学—物理]