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针对在役铆钉气隙受铆钉或者工件遮挡造成难以有效检测与定量评估的问题,建立ANSYS有限元仿真三维模型,开展垂向减震器座铆钉气隙的远场涡流检测仿真与试验研究。研究结果表明:有效电磁场可渗入铆钉孔约10 mm深处,具有检测深度深,灵敏度高的优点;提出定量表征气隙的最优特征量,在检测信号的幅值、相位、实部、虚部这4个特征量中,信号虚部分量与铆钉气隙的线性相关系数高达0.999,最能表征气隙。试验测试结果与仿真结论相吻合,规律一致,证明研究成果的可信性。
Aiming at the problem that the existing rivet air gap is hard to be detected and quantitatively evaluated by rivets or workpiece shading, ANSYS finite element simulation 3D model is established to simulate and test the far-field eddy current testing of rivet air gap of vertical shock absorber. The results show that the effective electromagnetic field can penetrate into the rivet hole about 10 mm deep, which has the advantages of deep detection depth and high sensitivity. The optimal characterization of the air gap is proposed. The amplitude, phase, real part, Department of these four features, the signal imaginary component of the rivet air gap and the linear correlation coefficient up to 0.999, the most characterization of air gap. The test results are in accordance with the simulation results and the same rules, which proves the credibility of the research results.