Mini-micro Sensor & Device for Wire Rope MFL Testing
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摘要: 以#28钢丝绳为例，通过有限元法分析不同磁化方法对钢丝绳磁化效果的差异，探讨穿过式磁化器中各项几何参数的变化对于钢丝绳内部磁场和缺陷漏磁信号的具体影响，得到漏磁场轴向分量随磁化器几何尺寸的变化规律，得出钢丝绳检测穿过式磁化器的最优尺寸，并介绍了一种小尺寸的差分检测传感器。通过试验验证了上述磁化方法和传感器的检测效果，试验结果与有限元仿真结果基本相符，符合检测要求。结果有助于从整体上选择磁化方法，优化和微型化设计检测传感器，提高漏磁检测灵敏度。Abstract: Different effects of two magnetization methods were compared by FEM with no.28 wire rope being as an example. The magnetizer size influence on rope magnetic field and MFL signals was analyzed to obtain correlation curves of MFL axial component which was changing with magnetizer size and hence to obtain the best size of probe for rope detect. A miniature differential Sensor Array was introduced, the performance of the analysis method and sensor were validated by experiments and the experimental result just met the analysis result. The result can be used in magnetic circuit design for improving magnetic effect and testing sensitivity.
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Keywords:
- Rope /
- Magnetic flux leakage testing /
- Magnetization method /
- Sensor /
- Micro design
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[1] WEISCHEDEL H R. The inspection of wire ropes in service: a critical review［J］. Mater Eval,1985,43(13):1592-605. [2] JOMDECHA C. Design of modified electromagnetic main-flux for steel wire rope inspection［J］. NDT&E International,2009,42:77-83 [3] 赵敏，张东来.钢丝绳典型缺陷的漏磁场有限元仿真［J］.无损检测,2009,31(3):177-180. [4] 袁建明，武新军，康宜华.可重构斜拉索磁性无损检测机器人技术研究［J］.武汉理工大学学报,2008,32(3):442-445. [5] 林其壬，赵佑铭.磁路设计原理［M］.北京：机械工业出版社,1987:95-100.
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