漏洩磁束探傷法を用いたワイヤロープ検査におけるノイズ低減のための磁気センサ最適配置の検討

Optimal Arrangement of Magnetic Sensors for Noise Reduction in Wire Ropes Inspection Using Magnetic Flux Leakage Testing

抄録

Inspection of wire ropes are done mainly by visual observation. However, since the wire rope has grease or rust, it is difficult to be detected damage. Therefore, magnetic flux leakage testing has been utilized as a method to compensate for the visual inspection. Wire ropes are a complex shape. So, the leakage magnetic flux is also generated in addition to the damaged portion. This magnetic flux leakage prevents the detection of minor damage. Until now, treatment of noise was performed by using the signal processing. However, since the detection of damage buried in noise, difficult in very small damage. In this study, for the purpose of clarifying the flow of the magnetic flux of the wire rope, performs static magnetic field analysis by the finite element method. Using the results from numerical analysis, we study the angle of the magnetic sensor capable of noise reduction. Further, by performing the damage detection experiments with different angles of the magnetic sensor, performs consider whether it is possible noise reduction by changing the sensor angle. It indicated to be useful in damage detection experiment of the wire rope in the magnetic flux leakage testing.