Analysis of weakening rule of filling state of parallel wire bundle onmagnetic flux leakage of surface defect
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摘要: 平行钢丝束作为缆索桥梁的关键受力构件，直接影响桥梁结构的安全。基于漏磁检测原理，利用柔性桥索检测传感器对平行钢丝束典型缺陷进行检测。采用点检测和线扫查两种检测方式，研究了圆形和扇形两种排布方式下不同平行钢丝束的填充状态对表层缺陷漏磁场的影响。针对观察到的平行钢丝束填充会减小表层缺陷漏磁场强度的现象，提出了一种用于预测该弱化规律的模型，在缺陷钢丝周围有、无平行钢丝束填充的两种状态下研究了不同位置表层缺陷的漏磁场分布，得出了两种填充状态下缺陷漏磁场与缺陷位置的关系。Abstract: As the crucial stress component of cable bridge, parallel wire bundle would directly affect the safety of bridge structure. Based on the principle of magnetic flux leakage testing, the typical defects of parallel wire bundles are detected by using the flexible bridge cable detection sensor. The influence of the filling state of different parallel steel bundles on the magnetic leakage field of surface defects under circular and sector arrangement was studied by using point detection and line scanning. In view of the observed phenomenon that the filling of parallel steel wire bundles will reduce the magnetic leakage field strength of surface defects, a model for predicting the weakening law is proposed,and the magnetic leakage field distribution of surface defects at different positions was studied under the two states of filling with and without parallel steel bundles around the defective steel wire, and the relationship between the magnetic leakage field and the defect position under the two filling states was obtained.
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