A Nondestructive Testing Method for Steel Wire Rope Based on Axial Magnetization of Single Permanent Magnet Ring
In order to improve the detection ability for steel wire rope defects and simplify the excitation structure,a nondestructive tes-ting method for steel wire rope based on a single axial magnetizing permanent magnet ring is proposed.By analyzing the leakage magnet-ic field generated by a single axial magnetized permanent magnetic ring excitation method,it is concluded that the motion direction of the defect can be sensed through leakage magnetic field.On this basis,the finite element modeling of the excitation mode is carried out by using the COMSOL software,and the distribution of magnetic leakage at the defect is calculated through simulation.The correctness of the conclusion is verified,and the factors affecting the magnetic leakage field are analyzed.Combined with the performance parame-ters of Hall element,the optimal location of the sensor is given.Finally,through the design of signal conditioning circuit,combined with 3D printing,the sensor structure is realized,and the experimental platform is built.The simulation results show that for the same defect,the maximum leakage magnetic field generated by the proposed excitation method is obviously larger than that of the traditional method.The experimental results show that for 10 mm thick steel wire rope,when the lift value of Hall element arrangement is 3 mm and 8 mm,the movement direction of steel wire rope can be sensed through the MFL signal at the defect.
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