摘要
通过对金属部件进行电磁加载会在金属裂纹处激发出声发射信号,利用这一现象可以实现对金属结构件的无损检测。本文对电磁声发射技术的原理与实现进行了深入分析,设计了相应的电磁加载实验装置,并针对铝质薄板试件进行了电磁声发射试验,通过对实验采集信号进行时频分析,研究了电磁声发射信号随加载条件和试件类型的变化规律,验证了带裂纹金属上能够产生电磁声发射现象,为该技术的工程应用打下了良好的基础。
Nondestructive detection can be realized with the effect that the dynamic electromagnetic loading on the sheet metal can generate a stress field stimulating stress waves from the defects. The principle and implementation procedure of the electromagnetically induced acoustic emission （EMAE） is thoroughly analyzed in this paper. The high-current pulse generator which is used in the EMAE experiment is designed. The simple time-frequency analy- sis to the experimental signal is achieved by using fast Fourier transform （FFT）. It researches the change patterns of EMAE signal with the different specimens and electromagnetic loading conditions. It verifies that it could excite the phenomenon of EMAE in the metal plate with the crack. The experimental results lay a good foundation for the engineering application of EMAE.
出处
《电工电能新技术》
CSCD
北大核心
2011年第1期84-88,共5页
Advanced Technology of Electrical Engineering and Energy
基金
国家自然科学基金项目(51077036)
河北省自然科学基金项目(E2007000067)
关键词
电磁声发射
大电流直接加载
无损检测
频谱分析
electromagnetically induced acoustic emission
high current load
nondestructive testing
spectrum analysis
