基于压电超声导波的管道缺陷检测数值模拟  

Numerical Simulation of Pipeline Defect Detection Based on Piezoelectric Ultrasonic Guided Wave

作　　者：彭芬[1] 许斌[2,3] 陈洪兵[1] 王海东[1] 

机构地区：[1]湖南大学土木工程学院,湖南长沙410082 [2]华侨大学土木工程学院,福建厦门361021 [3]华侨大学福建省结构工程与防灾重点实验室,福建厦门361021

出　　处：《压电与声光》2017年第3期462-466,共5页Piezoelectrics & Acoustooptics

基　　金：国际科技合作与交流专项基金资助项目(2014DFE70230);湖南省科技计划重点项目(2014TT1006)

摘　　要：建立了压电材料与管道结构的超声与机械多物理场耦合有限元数值分析模型,采用ANSYS数值分析软件,在认识管道中导波频散特性的基础上,对利用压电陶瓷(PZT)激发的纵向导波进行数值模拟,探究压电超声用于管道损伤识别的机理。在管道模型的自由端周向分布16个PZT激励器激发入射导波,运用与之相距50mm处的PZT接收检测信号,对不同尺寸的单裂纹管道模型进行了数值模拟。结果表明,运用纵向导波检测能准确识别出管道缺陷的存在,且回波的幅值与缺陷尺寸有明显的正相关性,对接收信号时程进行分析可较准确地定位缺陷位置。The f ini te element numer ical simulat ion model considering the mult i-physical f ield coupl ing between the ultrasonic and machinery in the piezoelectric material and the pipeline structure is established. The numerical simulation of the longitudinally guided wave excited by PZT actuator is carried out by using the ANSYS numerical a-nalysis software to investigate the mechanism of the pipeline damage identification based on the piezoelectric ultra-sonic. 16 PZT actuators are distributed circumferentially at the free end of each pipe model to excite the incident guided wave and a PZT sensor 50 mm apart from the actuator was used to receive the measured signals. The models of single crack pipes with different sizes are simulated numerically. The results show that the existence of defects in the pipeline can be identified accurately by using the longitudinally guided wave measurement method, and the echo amplitude is positively related to the size of the crack defect. At the same time, by analyzing the time history signal, the location of defects can be determined accurately.

关 键 词：频散 导波 管道 缺陷 数值模拟 

分 类 号：TN384[电子电信—物理电子学]