期刊刊名：南台學報 　 卷期：34卷4期

篇名出版日期：2009年12月2日

作者：Yuh-Tay Sheen,Chien-Lun Huang,沈毓泰,黃健倫

語言：English

關鍵字：量化指標,小波包絡函數,共振模態,指數衰減頻率,軸承損壞診斷,Quantitative index, Wavelet-based enveloping function, Resonance mode, Exponential decay frequency, Bearing defect diagnosis

被點閱次數：3次

閱讀時間：74sec

摘要：
In this paper, a wavelet-based enveloping function is proposed to apply in the envelope detection for the bearing vibration and, then, the estimation of exponential decay frequency for the envelope signal is proposed to be a quantitative index for diagnosing the bearing defect. In the function, there are three parameters required to assign for adjustment and designation of the filtering passband, which are the low cut-off frequency, the high cut-off frequency and the dilation. Accordingly, it would be convenient to apply in the high-frequency resonance technique to filter out one of the resonance modes. With properly designating the above parameters, the wavelet-based enveloping function could be a Hilbert transform pair to derive a complex signal. Thus, the mode vibration and its corresponding envelope could be easily derived from the real part and the absolute value of the complex signal, respectively. According to the envelope signal, the exponential decay frequency could be estimated and applied in the bearing defect diagnosis. From theoretical and experimental studies, it is shown that the designation of wavelet-based enveloping function possesses a satisfied property of fast waveform convergence and could be effectively applied in the envelope detection. In addition, the exponential decay frequency derived from the envelope signal could be a quantitative index for the bearing defect diagnosis.

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