基于科赫差测量平面涡流传感器的裂纹检测性能研究

doi:10.3901/JME.2023.10.017

摘要/Abstract

摘要： 柔性平面涡流传感器被广泛应用于具有复杂形貌零部件表面、近表面裂纹的探测中。基于传统线圈结构设计的柔性平面涡流传感器对特殊方向短裂纹的探测存在漏检率高的问题。为了提升柔性平面涡流传感器对各方向裂纹的检测灵敏度并抑制检测过程中的提离噪声,将差测量思想与分形几何相结合,提出一种科赫差测量平面涡流传感器。通过有限元分析,研究新型传感器与同尺寸的圆形差测量传感器对不同方向、长度、宽度和深度裂纹的检测性能,并对比分析二者的差异。有限元分析结果表明,对于90°方向5 mm长裂纹的检测,科赫传感器输出信号峰峰值比圆形的大71.8%;对于长度为3 mm裂纹的检测,科赫传感器信号峰峰值比圆形传感器大41.0%;在检测宽度为0.1 mm的裂纹时,科赫传感器输出信号峰峰值比圆形传感器大142.6%;科赫传感器在检测深度大于0.8 mm的裂纹时,其输出信号峰峰值是圆形传感器的1.5倍以上。有限元分析与试验结果表明,与圆形线圈相比,科赫线圈设计的平面涡流传感器在短裂纹探测方面具有更显著的优势。

关键词: 涡流检测, 差测量传感器, 科赫曲线, 分形几何, 无损检测

Abstract: Flexible planar eddy current probes are broadly used for the inspection of cracks which located on the surface and subsurface of components with complex shape. The flexible planar eddy current probe designed by conventional coil structure has a high rate of missed detection for short cracks in special orientations. In order to improve the detection sensitivity to cracks in different orientations and restrain the lift-off noise during the testing process, the planar Koch differential pick-up eddy current probe is proposed via combining the idea of differential pick-up with Koch fractal geometry. Through finite element analysis, the detectability performances of the probe to cracks with different orientations, lengths, widths, depths are researched. At the same time, the Koch differential pick-up probe is compared with the differential pick-up probe designed by conventional circular coil. The result of finite element analysis shows that:for the inspection of crack with 5 mm in length in 90° orientation, the peak-to-peak value (V_pp) of signal output from Koch probe is 71.8% larger than that of circular probe; the V_pp of signal output from Koch probe is 41.0% larger than that of circular probe for the inspection of crack with 3 mm in length; the V_pp of signal output from Koch probe is 142.6% larger than that of circular probe when detecting crack with 0.1 mm in width; when the crack is larger than 0.8 mm in depth, the V_pp of signal output from Koch probe is more than 1.5 times of circular probe. The results of finite element analysis and experiment show that the planar eddy current probe designed by Koch coil possesses more conspicuous edge for the inspection of short cracks compared with the circular coil.

Key words: eddy current testing, differential pick-up probe, Koch curve, fractal geometry, nondestructive testing

中图分类号:

TH878

陈国龙, 曹政, 张帅帅, 靳伍银. 基于科赫差测量平面涡流传感器的裂纹检测性能研究[J]. 机械工程学报, 2023, 59(10): 17-29.

CHEN Guolong, CAO Zheng, ZHANG Shuaishuai, JIN Wuyin. Study on the Crack Detectability Based on Koch Differential Pick-up Planar Eddy Current Probe[J]. Journal of Mechanical Engineering, 2023, 59(10): 17-29.

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