摘要
为利用激光超声技术实现管道缺陷的定量表征,应用有限元方法分析被激光辐照金属管道表面产生的超声波与管道缺陷相互作用的过程。通过传播图像探究超声波在传递过程中的模式转换,在远场激发的方式下,分别探讨不同高度、宽度以及角度的缺陷对激光超声波的影响,结合接收点的位移信号分析超声波与缺陷作用的复杂过程,并应用惠更斯原理分析其产生的原因,最后提出一种管道缺陷定量表征的方法。通过试验研究对理论结论进行验证。试验研究和理论结论表明,缺陷位置可通过表面波遇到缺陷后产生反射回波信号的接收时间定量表征,缺陷深度可通过缺陷底部产生反射表面波信号的接收时间定量表征,缺陷角度可通过缺陷底部表面波转化纵波信号的接收时间定量表征,为逆向推算缺陷的尺寸奠定了理论基础。
In order to realize the quantitative characterization of pipe defects by laser ultrasonic technology, the interaction process of ultrasonic wave generated on the surface of metal pipe irradiated by laser and pipe defects was analyzed by finite element method. This paper explores the mode conversion of ultrasonic in the transmission process through the transmission image, and it also discusses the influence of defects with different height, width and angle on laser ultrasonic in the way of far-field excitation. Combined with the displacement signal of the receiving point, this paper analyzes the complex process of the interaction between ultrasonic and defects, and it analyzes the corresponding causes by applying Huygens principle. Finally, it puts forward a pipeline defect determination method Methods of quantitative characterization. The theoretical conclusion is verified by experimental research. The experimental research and theoretical conclusions show that the defect position can be quantitatively characterized by the receiving time of the reflected echo signal generated after the surface wave encounters the defect, the defect depth can be quantitatively characterized by the receiving time of the reflected surface wave signal generated at the bottom of the defect, and the defect angle can be quantitatively characterized by the defect angle. The quantitative characterization of the reception time of the bottom surface wave converted longitudinal wave signal lays a theoretical foundation for the reverse estimation of the size of the defect.
作者
曹建树
纪卫克
张昊楠
张诚
张海超
Cao Jianshu;Ji Weike;Zhang Haonan;Zhang Cheng;Zhang Haichao(College of Mechanical Engineering,Beijing Institute of Petrochemical Technology,Beijing 102617,China)
出处
《应用激光》
CSCD
北大核心
2022年第4期132-139,共8页
Applied Laser
基金
北京市自然科学基金(3182008)。
关键词
激光超声
有限元
缺陷
定量表征
laser ultrasonic
finite element
defect
quantitative characterization
