Characteristics analysis for EMAE and crack orientation under a horizontal magnetic field
CAI Zhichao1,LIU Suzhen2,ZHANG Chuang2,ZHANG Yanwei2,YANG Qingxin2,3
1.School of Electrical and Automation Engineering,East China Jiaotong University,Nanchang 330013,China;
2.Province-Ministry Joint Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability,Hebei University of Technology,Tianjin 300130,China; 3.Key Laboratory of Advanced Electrical Engineering and Energy Technology,Tianjin Polytechnic University,Tianjin 300387,China
Abstract：The key problem for the metallic structures’ health monitoring using the acoustic emission(AE) method is to establish a relationship between a suitable load and structures’ AE signals excited.But the current AE tests mostly use an offline loading on structures with the contact method.Here,an AE testing method using a contactless local electromagnetic online loading was proposed.Firstly,the mechanism of electromagnetically induced acoustic emission(EMAE) was studied at a microscopic level based on the electro induced dislocation and free electron movement theory.Secondly,the characteristic differences of EMAE signals under various electromagnetic loading conditions were studied,the emission characteristics of the collected nonstationary EMAE signals were studied with Hilbert-Huang transformation.Finally,the relationships among the energy percentage of intrinsic mode functions(IMFs),the cross-correlation coefficients of IMFs,the time-frequency figures of IMFs and crack orientation were established through changing the excitation direction of horizontal magnetic field.
蔡智超 1,刘素贞 2,张闯 2,张严伟 2,杨庆新 2,3. 施加水平磁场下电磁声发射与裂纹指向特征分析[J]. 振动与冲击, 2017, 36(5): 238-245.
CAI Zhichao1,LIU Suzhen2,ZHANG Chuang2,ZHANG Yanwei2,YANG Qingxin2,3. Characteristics analysis for EMAE and crack orientation under a horizontal magnetic field. JOURNAL OF VIBRATION AND SHOCK, 2017, 36(5): 238-245.
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