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用有限元法研究了工件内部磁场强度、提离值和工件表面裂纹漏磁场B_y分量之间的关系,比较了工件内部磁场和提离值对漏磁场大小的影响.给出了两者的曲线,为实测中选择和优化工件磁场强度和提离值提供了依据.首次从检测可靠性角度,考察了传感器与工件距离对检测结果的影响,给出了波动大小为0.05mm时产生的误差值和相应的波动曲线,提出了在满足检测灵敏度的条件下传感器的提离值并不是越小越好的新观点.
The relationship between the magnetic field strength inside the workpiece, the lift-off value and the B_y component of the leakage magnetic field on the workpiece surface crack was studied by using the finite element method. The effects of the magnetic field and the lift-off value on the leakage magnetic field were compared. , Which provides the basis for the selection and optimization of the magnetic field strength and lift-off value of the workpiece.Firstly, the influence of the distance between the sensor and the workpiece on the test results is investigated from the reliability of the test, and the error value when the fluctuation is 0.05mm And the corresponding fluctuation curve, a new viewpoint that the lift-off value of the sensor is not as small as possible while meeting the detection sensitivity is proposed.