Simulation and Structural Optimization of ACFM Excitation Probe
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摘要: 应用COMSOL Multiphysics软件建立了交变电磁场检测缺陷的有限元模型，基于仿真模型分析了不同几何尺寸的磁芯对被检工件表面感应电流的均匀分布和工件缺陷检测效果的影响。研究了磁芯腿部高度、截面宽度和上部长度3个参数变化对工件感应电流均匀性分布和感应磁场信号分布的影响特征，得到了不同几何参数下的激励线圈对缺陷检测灵敏度的影响结果。在不同几何参数的U型探头激励下，得出了工件缺陷电磁场信号的特征分布情况以及检测缺陷时的最优磁芯几何参数，为U型交变电磁场激励探头的优化设计提供了依据。Abstract: This paper establish the simulation model of alternating electromagnetic field defect detection with COMSOL Multiphysics software. Based on the simulation model, the influence of different size magnetic core on the uniform distribution of induced current and on the defect detection has been simulated. The effect of three parameters related with the magnetic core, the height, the width and the length, on the distribution of the induced current and on the signal distribution of the inductive magnetic field was studied. The effect of excitation coil with different parameters on the defect detection sensitivity was obtained. The characteristic distribution of electromagnetic field signal of the defects under U-shaped excitation probe with different geometric parameters is also obtained. The result of the optimum geometric parameters of the magnetic core is acquired. It provides the evidence to the optimal design of U-shaped excitation probe of ACFM system.
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