基于EMD-SVD的声发射信号特征提取及分类方法

被引:49
作者
徐锋
刘云飞
机构
[1] 南京林业大学信息科学技术学院
关键词
声发射; 经验模态分解; 奇异值分解; 特征提取; Mahalanobis距离;
D O I
暂无
中图分类号
TB302 [工程材料试验];
学科分类号
082905 [生物质能源与材料];
摘要
针对胶合板损伤声发射(AE)信号的非平稳性和损伤类别特征相互重叠的实际情况,提出了基于经验模态分解(EMD)和奇异值分解(SVD)相结合的信号特征提取与识别方法.首先对AE信号进行EMD分解,运用互相关系数和方差贡献率筛选出包含主要信息的本征模态函数(IMF)分量;其次对各IMF分量构建的初始特征矩阵进行SVD分解,将得到的奇异值作为表征各损伤信号的特征向量;最后建立Mahalanobis距离判别函数对各损伤信号进行识别分类.五层胶合板损伤的实测数据表明,该方法能够方便地提取出AE信号特征并对其损伤类型进行有效的识别.
引用
收藏
页码:1238 / 1247
页数:10
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