Abstract：Electromagnetically induced acoustic emission (EMAE) technique is a new nondestructive testing (NDT). It did nondestructive detection with the effect of dynamic electromagnetic loading to generate a stress field stimulating stress waves from the defects. This paper analyzes the principle and implementation procedure of the EMAE. It verifies that it could excite the phenomenon of EMAE in the metal plate with the crack by means of time-frequency analysis to the experimental signal by using fast Fourier transform (FFT). A criterion of the metal plate with the crack based on the wavelet packet transform and energy partition is obtained. This work laid a good foundation for the engineering application of EMAE.
张闯, 刘素贞, 杨庆新, 金亮, 冯玲玲, 杨素梅. 基于FFT和小波包变换的电磁声发射信号处理[J]. 电工技术学报, 2010, 25(4): 24-28.
Zhang Chuang, Liu Suzhen, Yang Qingxin, Jin Liang, Feng Lingling, Yang Sumei. Signal Processing of Electromagnetically Induced Acoustic Emission Based on FFT and Wavelet Packet Transform. Transactions of China Electrotechnical Society, 2010, 25(4): 24-28.
[1] 沈功田. 中国特种设备无损检测的进展及国际合作与交流[J]. 无损检测, 2008, 30(3): 133-141. [2] Charles J Hellier著. 无损检测与评价手册[M]. 戴光, 徐彦廷, 等译. 北京: 中国石化出版社, 2006. [3] Finkel P, Godinez V, Miller R. Electromagnetically induced acoustic emission—novel NDT technique for damage evaluation[C]. American Institute of Physics Conf. Proc., 2001, 557: 1747-1754. [4] 刘素贞, 杨庆新, 金亮, 等. 电磁声发射技术在无损检测中的应用研究[J]. 电工技术学报, 2009, 24(1): 23-27. [5] 陈中剑, 杨庆新. 电磁声发射技术研究[J]. 大众科技, 2006, 92(6): 23-24. [6] Velayudham A, Krishnamurthy R, Soundarapandian T. Acoustic emission based drill condition monitoring during drilling of glass/phenolic polymeric composite using wavelet packet transform[J]. Materials Science and Engineering A, 2005, 412(1): 141-145. [7] 耿荣生. 全尺寸飞机疲劳试验过程中的无损检测及声发射监测技术研究[J]. 南昌航空大学学报(自然科学版), 2007, 21(3): 1-7. [8] Zhang Chuang, Liu Suzhen, Yang Qingxin, et al. Experimental study on high-current pulse generator for electromagnetically induced acoustic emission[C]. The 11th International Conference on Electrical Machines and Systems (ICEMS2008), 2008: 2205-2207. [9] Gong Z, Nyborg E O, Oommen G. Acoustic emission monitoring of steel railroad bridges[J]. Materials Evaluation, 1992, 50(6): 883-887. [10] Kamala G, Hashem I J, Barhorst A, et al. Discrete- wavelet analysis of acoustic emissions during fatigue loading of carbon fiber reinforced composites[J]. Journal of Reinforced Plastics and Composites, 2001, 20(3): 222-238.
2010, Vol. 25 
