利用电磁学电致涡流原理，采用有限元方法，建立了电磁声发射数学模型，对含裂纹的铝板进行了电磁场数值模拟，分析了裂纹尺寸对裂纹尖端洛伦兹力的影响，并在实验室条件下，对不同尺寸裂纹进行了电磁声发射试验。结果表明，通过幅值参数可以判断试件有无缺陷，在频谱分析时，信号的高频成分有峰值现象。利用小波包分析方法对声发射信号波形进行了分解与重构，发现在裂纹长度或者深度增加时，高频信号的波形和频谱的峰值电压也逐渐变大，仿真分析与试验结果一致。

In this paper, a mathematical model of electromagnetic acoustic emission is established by using electromagnetic eddy current principle and finite element method. The electromagnetic field of cracked aluminum plate is simulated numerically, and the influence of crack size on the Lorenz force at the crack tip is analyzed. Under laboratory conditions, electromagnetic acoustic emission experiments with different crack sizes are carried out. The results show that the amplitude parameters can determine whether there exists a defect or not in the specimen. In the frequency analysis, the high frequency component of the signal has a peak phenomenon, and the wavelet packet analysis is used to decompose and reconstruct the acoustic emission waveform. It is found that when the crack length or depth increases, the peak waveform and the peak voltage of the high frequency signal also increase gradually. The simulation analysis is in agreement with the experimental results.