摘要
传统油气管道焊缝缺陷检测技术对作业环境、管道表面质量要求较高,在低频振动环境下易受到电磁干扰,焊缝缺陷检测能力较弱。提出一种低频振动环境下,基于激光超声的油气管道焊缝缺陷检测方法研究,首先基于激光超声产生机理,构建一种用于焊缝缺陷检测的激光超声检测模型;依据热固耦合思想分析热应力的传递过程,并提取激光超声波在检测过程中的传播特性;对接收到的激光超声波信号进行希尔伯特变换,能够对油气管道中的缺陷位置、大小做出精确的判断和检测。仿真实验结果证明,提出的油气管道焊缝缺陷检测方法能够在低频振动环境下,快速地定位缺陷位置,检测精度高、误差率低。
The traditional detection technology of weld defects in oil and gas pipeline has relatively high quality in working environment and the pipeline surface. It is has poor defects detection capability in the low frequency vibration environment in which it＇s easy to have electromagnetic interference. Therefore a new gas pipeline weld defect detection method based on laser ultrasonic under a low frequency vibration environment is proposed. First construct a laser ultrasonic detection model of weld defects based on the laser ultrasonic generation mechanism. Analysis the transmission process of thermal stress based on thermal mechanical coupling thought,and extract the propagation characteristics of laser ultrasonic in the detection process. Do the Hilbert transformation of the received laser ultrasonic signal,which can make accurate detection of defect location and size judgment in oil and gas pipelines. The simulation results show that the proposed method can detect the defect location quickly and accurately in low frequency vibration environment.
出处
《激光杂志》
北大核心
2017年第8期24-27,共4页
Laser Journal
基金
上海科技发展专项资金(基础与应用基础研究方向)项目(2016A040415542)
关键词
低频振动
激光超声
油气管道
缺陷检测
希尔伯特变换
low frequency vibration
laser ultrasonic
oil and gas pipeline
defect detection
hilbert transform
