摘要
为研究高速下钢管缺陷漏磁信号的变化规律,对运动状态下涡流分布特点及缺陷漏磁场分布特征进行理论分析,根据不同位置信号分布特征提出了一种提高内壁缺陷检测效果的传感器安装方式;设计了高速漏磁检测系统,运行速度范围为0.2~12 m/s;利用该系统对不同运行速度状态下缺陷信号特点及所提方法进行实验研究。结果表明,高速下涡流磁场在钢管内壁与线圈磁场反向,使得检测区域内钢管内壁磁场减弱,缺陷信号降低,且缺陷尺寸增加,检测效果受涡流影响程度越严重;随着检测速度增加,钢管内壁磁场最大值由线圈中心位置向钢管运动方向移动,位于该区域的磁传感器的内壁缺陷信号检测效果优于位于线圈中心位置传感器检测效果,为提高内壁缺陷检测能力提供了一种思路。
In order to study the change rule of magnetic flux leakage signal of steel pipe defects at high speed,the distribution characteristics of eddy current and magnetic flux leakage field under moving state were theoretically analyzed.According to the signal distribution characteristics of different positions,a sensor installation method to improve the detection effect of inner wall defects was proposed.A high-speed magnetic flux leakage detection system with a speed range of 0.2~12 m/s was designed,and the characteristics of defect signals and the proposed methods under different operating speeds were studied experimentally.The results show that the eddy current magnetic field is opposite to the coil magnetic field on the inner wall of the steel pipe at high speed,which weakens the magnetic field on the inner wall of the steel pipe and reduces the defect signal in the detection area.As the defect size increases,the test result is more seriously affected by eddy current.With the increase of the detection speed,the maximum value of the magnetic field in the inner wall of the steel pipe moves from the center of the coil to the direction of the steel pipe movement.The detection effect of the inner wall defect signal of the magnetic sensor located in this area is better than that of the sensor located in the center of the coil,which provides a way to improve the detection ability of the inner wall defect.
作者
耿浩
杨理践
项行鸿
GENG Hao;YANG Li-jian;XIANG Xing-hong(School of Information Science and Engineering,Shenyang University of Technology,Shenyang 110870,China;Shaanxi Provincial Natural Gas Co.,Ltd.,Xi an 710016,China)
出处
《仪表技术与传感器》
CSCD
北大核心
2021年第11期88-93,98,共7页
Instrument Technique and Sensor
基金
国家自然科学基金项目(62101356)
辽宁省教育厅高等学校基本科研项目(LJKZ0134)
辽宁省自然基金资助计划项目(2019-MS-243)。
关键词
漏磁检测
涡流效应
TMR传感器
有限元仿真
涡流扰动
高速检测系统
magnetic flux leakage testing
eddy current effect
TMR sensors
finite element simulation
eddy current disturbance
high speed testing system
