ZERO PHASE WAVELET TRANSFORM FOR DETECTING BEARING LOCALIZED DEFECTS

机译：零相小波变换用于检测轴承局部缺陷

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This study designed a wavelet in such a way that its Fourier transform has zero phase (hence the name zero-phase wavelet). Since the wavelet has zero phase, the resulted wavelet transform's phase part solely depends on the phase of the signal within the passing band of the wavelet used. With its ability to localize in time and frequency domains, the magnitude part reveals local amplitude modulation and the phase part reveals local phase modulations associated with the frequency band defined by the wavelet.rnThis study established the utility of the zero phase wavelet for bearing localized defect detection, examined the magnitude and phase maps of such wavelet transform of bearing signals to determine if it can detect periodic structural ringings as effectively as the prevailing envelope spectrum technique and if the phase part brings any additional diagnostic information.rnIt was found that wavelet transform is more effective than the envelope spectrum and the additional phase information complements the amplitude information and enhances the sensitivity for the detection.

机译：本研究设计了一种小波，使其傅里叶变换具有零相位（因此称为零相位小波）。由于小波具有零相位，因此所得的小波变换的相位部分仅取决于所用小波的通带内信号的相位。凭借其在时域和频域中定位的能力，幅度部分揭示了与小波定义的频带相关的局部幅度调制，而相位部分揭示了与小波定义的频带相关的局部相位调制。检测，检查轴承信号的这种小波变换的幅度和相位图，以确定它是否可以像流行的包络谱技术一样有效地检测周期性结构振铃，以及相位部分是否带来任何其他诊断信息。比包络频谱更有效，并且附加相位信息补充了幅度信息并增强了检测灵敏度。

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来源
《Society for Machinery Failure Prevention Technology Meeting; 20050418-21; Virginia Beach,VA(US)》|2005年|147-156|共10页
会议地点 Virginia BeachVA(US)
作者
C. James Li;
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作者单位

Department of Mechanical, Aerospace, and Nuclear Engineering Rensselaer Polytechnic Institute Troy, NY 12180;

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会议组织
原文格式 PDF
正文语种 eng
中图分类 TH171;
关键词
bearing; diagnostics; wavelet transform; zero-phase;

机译：轴承诊断；小波变换零相;

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ZERO PHASE WAVELET TRANSFORM FOR DETECTING BEARING LOCALIZED DEFECTS

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