首页 | 本学科首页   官方微博 | 高级检索  
     检索      

基于有限元的空耦超声相控阵Lamb波激发与检测
引用本文:张迪,吴先梅.基于有限元的空耦超声相控阵Lamb波激发与检测[J].应用声学,2015,34(3):201-206.
作者姓名:张迪  吴先梅
作者单位:中国科学院声学研究所声场声信息国家重点实验室 北京 100190,中国科学院声学研究所声场声信息国家重点实验室 北京 100190
基金项目:(No. 11274337)
摘    要:基于非接触式空气耦合超声换能器的无损检测技术在常规板材、纤维复合材料、层状结构材料、粘接界面等的检测中有了长足的发展。但是因为空气耦合超声本身的限制,对于如何提高空气声换能器的发射效率和接收灵敏度、提高检测中接收的信噪比成为这一领域的重要课题。因此有必要结合最新的信号处理技术探索新的无损检测形式。本文通过提出了基于电容式的空气声换能器阵列的构建和制作方法,应用有限元数值方法对一维线阵的空气声换能器阵列的动态偏转特性进行了模拟,并使用构建流固耦合模型对二维的空气声场及板材中的位移场进行计算。通过一维空气耦合相控阵的声束动态偏转激励了各向同性板中的Lamb波A0 和S0模式,并进行了分析,验证了此模型可以进一步用于基于空气耦合相控阵激励的Lamb波的无损检测中。

关 键 词:空气耦合超声换能器  无损检测  Lamb波激发  一维线性相控阵  有限元仿真
收稿时间:2014/12/17 0:00:00
修稿时间:4/2/2015 12:00:00 AM

The numerical simulation of the excitation and detection of Lamb waves using air-coupled ultrasonic phased array with finite element method
Di ZHANG and Xianmei WU.The numerical simulation of the excitation and detection of Lamb waves using air-coupled ultrasonic phased array with finite element method[J].Applied Acoustics,2015,34(3):201-206.
Authors:Di ZHANG and Xianmei WU
Institution:State Key Laboratory of Acoustics,Institute of Acoustic,Chinese Academy of Sciences,Beijing,P. R. China. 100190,State Key Laboratory of Acoustics,Institute of Acoustic,Chinese Academy of Sciences,Beijing,P. R. China. 100190
Abstract:The non-contact air-coupled ultrasonic transducer and the corresponding non-destructive detection methods have been greatly advanced recent years. It has been used in the detection of thin plate, fiber-reinforced composite plate, laminated structure and bonding strength testing. However, due to the limitation nature of the air-coupled ultrasonic detection, the problem remaining are how to improve the transmitting and receiving efficiency and sensitivity. It is necessary to combine the new developed signal processing technique and the numerical method to enhance the signal-noise ratio in the detection. In this paper, the finite element method is used to explore the dynamic focusing transmitted by a 1D linear air-coupled capacitive ultrasonic phased array. The air-coupled capacitive ultrasonic phased array is proposed and simulated numerically. The acoustic fields in air transmitted by the ultrasonic array are calculated and analyzed. The displacement fields in plate excited by the ultrasound are calculated and monitored. Lamb wave in plate is excited and then received in this model. Several Lamb wave modes, i.e. A0 and S0 are excited and in the numerical model based on the dynamic focusing scanning along the plate surface.
Keywords:Air-coupled  ultrasonic transducer  Non-Destructive  Testing  Lamb  waves excitation  1D  Linear phased  array  Finite  Element Simulation
点击此处可从《应用声学》浏览原始摘要信息
点击此处可从《应用声学》下载免费的PDF全文
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号