A Novel Wavelet Cluster-based Envelope Demodulation Approach with Application to Fault Diagnosis
A Morlet-like wavelet cluster-based method for band-pass filtering and envelope demodulation is described. Via appropriate choice of wavelet parameters, a wavelet cluster combined with multi-Morlet-like wavelets can be used as a band-pass filter with zero phase shift, flat topped pass-band and rapid attenuation in the transition band. It can be used to extract high frequency natural vibration components. The imaginary part of the Morlet-like wavelet cluster is the Hilbert transform of its real part. This can be used to implement envelope demodulation and extract the envelope component of the high frequency resonance band. The method is applied for fault diagnosis relating to bearing defects in a dry vacuum pump. It is shown that the fault characteristic frequencies can be extracted effectively. The efficacy of the method is demonstrated in experimental studies.
Morlet-like wavelet cluster band-pass filtering envelope demodulation fault diagnosis dry vacuum pump bearing fault
Wanlu Jiang Sarah K.Spurgeon John A.Twiddle Fernando S.Schlindwein
College of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, Hebei, China Department of Engineering, University of Leicester, University Road Leicester LEI 7RH, UK
国际会议
北戴河
英文
1021-1027
2007-06-06（万方平台首次上网日期，不代表论文的发表时间）