压力容器2025，Vol.42Issue(6)：56-62,7.DOI:10.3969/j.issn.1001-4837.2025.06.007
管道漏磁检测中提离效应影响及提离补偿方法研究
Research on the influence of lift-off effect and lift-off compensation method in pipeline magnetic flux leakage testing
摘要
Abstract
To address the issues of signal attenuation and defect size misjudgment caused by the lift-off effect in pipeline magnetic flux leakage testing,a defect lift-off compensation method was proposed.By constructing a reference relationship curve between defect size and indication length in the magnetic flux leakage signal,precise inversion of defect length and depth with lift-off compensation was achieved through least squares fitting.Meanwhile,a 3D model for magnetic flux leakage testing of pipeline defects was established to study the effects of sensor lift-off,magnetizer lift-off,and their combined lift-off on magnetic flux leakage signals.The results show that the weakening effect of sensor lift-off on the signal peak is significantly stronger than that of magnetizer lift-off,and their synergistic effect exacerbates signal attenuation.Under working conditions with lift-off values of 3 mm and 4 mm,the detection accuracy achieved is 2.0%and 2.4%error in defect depth prediction,and 3.4%and 3.7%error in length prediction,respectively.When the lift-off value is 4 mm and defect sizes are varied,the method maintaines a depth prediction error of 2.9%and a length prediction error of 3.6%.Compared with traditional parameter space search methods,this method significantly improves computational efficiency and detection accuracy.关键词
管道/漏磁检测/提离/传感器Key words
pipeline/magnetic flux leakage/lift-off/sensor分类
机械工程引用本文复制引用
王海奇,杨立清,李忠虎,王金明,张鑫宇,王建新..管道漏磁检测中提离效应影响及提离补偿方法研究[J].压力容器,2025,42(6):56-62,7.基金项目
国家自然科学基金项目(62161042) （62161042）
