基于Duffing振子与传统方法结合的导波检测方法研究  

RESEARCH ON GUIDED WAVE DETECTION METHOD BASED ON Duffing OSCILLATOR AND THE TRADITIONAL METHOD

作　　者：马延鋆 武静 王岩 沈宇驰 MA YanJun;WU Jing;WANG Yan;SHEN YuChi(China Railway Design Corporation,Guangzhou 510000,China;School of Mechanical Engineering,Dongguan University of Technology,Dongguan 523808,China;School of Civil and Water Resources,Qinghai University,Xining 810016,China)

机构地区：[1]中国铁路设计集团有限公司,广州510000 [2]东莞理工学院机械工程学院,东莞523808 [3]青海大学土木水利学院,西宁810016

出　　处：《机械强度》2024年第6期1287-1294,共8页Journal of Mechanical Strength

基　　金：国家自然科学基金项目(12202103);广东省基础与应用基础研究基金项目(2020A1515110666,2022A1515011324);东莞市科技特派员项目(20201800500632);广东省普通高校重点领域专项(2022ZDZX3032)资助。

摘　　要：超声导波无损检测技术因其检测耗时少、检测范围广等优点,近年来已经成为长距离管线检测领域的一项重要技术。为进一步提高识别精度,提出了利用传统的互相关、小波变换等理论与Duffing振子系统相混合的检测新方法。即将采集信号先利用互相关、小波变换进行预处理,然后输入Duffing系统进行检测。数值仿真结果表明,基于传统方法与Duffing振子结合的混合测量方法,可使检测信噪比下降至-38.4 dB,低于单独使用Duffing振子检测时的检测结果-23.9 dB,极大地提高了缺陷检测精度和灵敏度。研究结果对于实际工程中延长超声导波的检测范围,提高小缺陷的检测灵敏度具有重要意义。In recent years,ultrasonic guided wave technology has been widely used in nondestructive detection of long distance pipelines due to its advantages of short detection time and wide detection range.In order to further improve the recognition accuracy,a new detection method that combines the theory of cross correlation and wavelet transform with Duffing oscillator system was proposed.The collected signal was pretreated by cross-correlation and wavelet transform,and then input into Duffing system for detection.The results of numerical simulation show that the hybrid measurement method based on the combination of traditional method and Duffing oscillator,can reduce the detection signal-to-noise ratio to-38.4 dB,which is lower than the detection result when Duffing vibrator is used alone-23.9 dB,greatly improving the defect detection accuracy and sensitivity.The research results are of great significance for extending the detection range of an ultrasonic guided wave and improving the detection sensitivity of small defects in practical engineering.

关 键 词：无损检测 管道 超声导波 DUFFING振子 

分 类 号：TG115.28[金属学及工艺—物理冶金]