漏洩磁束探傷法を用いたワイヤロープ検査におけるストランドノイズ低減方法の検討

抄録

In recent years, magnetic flux leakage testing is considered as method of wire rope inspection. A coil, a Hall element, and a magnetoresistive element are adopted in the detector used for this method. It is often referenced to those that can detect small magnetic flux densities when adopting these elements. Detection of small damage also became possible. However, since the noise is contained much when inspecting the wire ropes, it is difficult to detect a very small damage. The noise due to strands of the ropes is an evaluation of only the magnitude of the magnetic flux density. Thus, discussion of the direction of the magnetic flux is not performed. In this research, the effect of noise caused by the strand is evaluated by numerical analysis. Furthermore, we verified whether useful in reducing noise due to strands of the rope by the detector's angle. Therefore, it was found that there is due to strands of the rope as cause of noise. It showed that it is possible to noise reduction by the detected angle of the detector and twist angle of the strand.