南京大学学报：自然科学版2012，Vol.48Issue(5)：537-543,7.
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
摘要
Abstract
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Key words
composite piezoelectric ultrasonic transducer/coupled vibration/resonance frequency/acoustic field分类
通用工业技术引用本文复制引用
张小丽,林书玉,付志强,王勇,胡文旭..柱形压电超声换能器的耦合振动和声场分析（英文）[J].南京大学学报：自然科学版,2012,48(5):537-543,7.基金项目
National Natural Science Foundation of China （）
