说明：  三篇关于小波变换的文章，主要用在故障诊断领域的主要利用小波变换来提取故障特征。（本文档需要用CAJViewer打开）
(Three articles on the wavelet transform, is mainly used in the field of fault diagnosis using wavelet transform to extract the main fault feature. (This document will need CAJViewer open))