离散小波包分析在非平稳信号处理中的应用

Application of Discrete Wavelet Packet in Signal Processing

用离散小波包将振动信号分解到不同的频带,然后对感兴趣的频带补零重构提高缺陷信号 的时频分辨率.对306滚动轴承的保持架缺陷作出了实际诊断,诊断结果与理论较为符合,证明离 散小波包是一种有效的弱信号提取与诊断方法.

Vibration signal is decomposed to different frequency bands by discrete wavelet packet;and then zero is added to the interested frequency band to reconstruct the defect signal,in that way higher time and frequency resolution are obtained.The diagnosis result of the holder defect of 306 rolling bearing coincides with theory according to discrete wavelet packet,so as to testify that the method is effective to the extraction and diagnosis of the weak signals of defects.