摘要
针对火车车轮辐板裂纹涡流检测中的变提离问题,设计了新型探头结构,可在保证抑制提离效应且高信噪比的前提下提高探头的灵敏度,以实现对粗糙表面裂纹的准确检测。提出了一种小体积的适用于辐板裂纹检测的并肩型探头结构,并基于场路耦合模型对探头进行了有限元分析,计算了探头磁场分布情况。通过实验测量了不同探头在不同提离下的线圈电压,对所提出的并肩型探头和传统差动探头的性能进行了比较,并利用该探头对实际车轮辐板裂纹进行了检测。研究结果表明,具有闭合磁路的探头对提离效应的抑制优于普通的差动式探头,所提出的并肩型探头能有效地检测出车轮辐板裂纹,并可实现车轮辐板裂纹长度的定量测量。
Aiming at the lift-off effect during the inspection of plate cracks using eddy current,the probe was optimized,which can ensure the high signal-noise-ratio and suppress the lift-off effect with the increase of sensitivity,to realize the accurate detection of the cracks in the rough surface. A side-by-side type probe with small size,suitable for the detection of plate crack,was proposed. The magnetic field induced by the probe was calculated with the numerical analysis of probes based on field-circuit coupling. Experiments were conducted to compare the performance of the proposed probe with traditional one. The results indicate that the probe with a closed magnetic circuit can suppress the liftoff effect more effective than the traditional differential probe,and side-by-side type probe can effectively detect the plate cracks in a wagon wheel and realize the quantitative measurement of crack length.
出处
《机电工程》
CAS
2015年第11期1423-1427,共5页
Journal of Mechanical & Electrical Engineering
关键词
辐板裂纹
涡流检测
提离效应
探头优化
plate cracks
eddy current testing
lift-off effect
probe optimization
