基于小波和凯瑟效应的电磁声发射信号特性分析  

Characteristics of Acoustic Emission Signals Induced by Electromagnetic Exciting Based on Wavelet Method and Kaiser Effect

作　　者：金亮[1] 杨庆新[1,2] 刘素贞[2] 张广超[1] 张献[1] 

机构地区：[1]天津工业大学电工电能新技术天津市重点实验室,天津300387 [2]河北工业大学电磁场与电器可靠性省部共建重点实验室,天津300130

出　　处：《电工技术学报》2013年第8期84-90,共7页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(51077036;51207105);高等学校博士学科点专项科研基金(20121201120003)资助项目

摘　　要：针对脉冲电磁涡流激励下,金属铝板的声发射信号具有宽频率响应以及低频干扰严重的特性,使用小波包和快速傅里叶(FFT)方法研究了不同加载条件下来自不同试件信号的高低频能量特性,揭示了不同试件的信号特征,得到了缺陷的声发射信号以及噪声的强度特性。基于声发射理论,将有限元计算的形变和声发射信号进行了归一化处理,并依据凯瑟效应,建立了有限元分析和声发射信号之间的内在联系,为理论和实验研究电磁声发射技术提供了重要的理论和实验依据。Aiming at the features of a wide frequency response and the serious low-frequency noise interference of Acoustic Emission （AE） induced by signal pulse eddy current, the Wavelet Method and Fast Fourier Transform （FFT） are used to analyze signals from different samples under different exciting currents. And the strength feature of AE signals is obtained through comparing the signals feature of different samples. The calculated deformation and experimental AE signals are normalized based on AE Theory. And according to Kaiser effect, the partly direct relationship between the acoustic emission signal and the calculated deformation can be obtained. This can provide useful references for the optimization analysis and engineering application of AE.

关 键 词：电磁声发射 金属板裂纹检测 涡流激励 信号处理 

分 类 号：TM930.124[电气工程—电力电子与电力传动]