摘要
管道超声导波检测应用中,为建立有效的缺陷识别技术,需要通过分析回波信号深入理解导波与管道缺陷相互作用过程中缺陷对导波信号的影响,进而形成可表征缺陷不同特征的方法。超声导波的模态转换过程及转换模态提供了大量缺陷信息,而合理使用多个超声导波模态进行管道缺陷分析可改善检测和评估的效果。轴对称纵向L(0,2)模态超声导波被大量应用于管道缺陷的检测与评估,L(0,2)模态导波系统中往往同时激发出低阶纵向L(0,1)模态。针对以上情况,本文研究了这两种纵向模态与缺陷交互过程中对称模态的转换过程,并提取各模态成分,进一步分析了转换模态随缺陷参数变化的规律。研究结果可为利用模态转换信息实现缺陷的检测评估建立理论基础。
To achieve effective defect identification of ultrasonic guided wave in pipeline,it is necessary to understand the influence of the interaction between guided wave and pipeline defect through analyzing reflection signal.Then,the methods of characterizing defect are studied.Mode conversion and converted modes contain a lot of defect information,and the reasonable use of multiple wave modes can improve the results of inspection and evaluation.Symmetric longitudinal L(0,2)mode guided-wave has been widely used in pipeline inspection.The lower order longitudinal L(0,1)mode is usually excited simultaneously.In view of the above problems,this paper studies the conversion procedure of two longitudinal modes when interacting with defect.The converted mode components are extracted and analyzed for their relationships with defect features.Research results are expected to offer a theoretical support for mode conversion analysis-based defect evaluation.
作者
王晓娟
赵锴
郑毅
Wang Xiaojuan;Zhao Kai;Zheng Yi(School of Mechanical and Precision Instrument Engineering,Xi'an University of Technology,Xi'an 710048,China)
出处
《仪器仪表学报》
EI
CAS
CSCD
北大核心
2020年第9期151-160,共10页
Chinese Journal of Scientific Instrument
基金
国家自然科学基金(51505374)项目资助
关键词
纵向超声导波
模态转换
转换模态
缺陷评估
longitudinal ultrasonic guided wave
mode conversion
converted mode
defect evaluation
