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| A Method and Application of Signal Demodulation Based on Wavelet Packet and Wavelet Ridge Decomposition |
| Siyuan Liu, Meng Wang, Haosong Hu |
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Abstract Vibration signals are non-stationary and nonlinear in rotating
machinery. Aiming at this phenomenon, a demodulation approach based
on wavelet packet decomposition and Wavelet Ridge was proposed in
this paper. The frequency range where energy was concentrated in was
acquired through the power spectrum of fault vibration signal. Then
the number of layers decomposed by the wavelet packet was
determined, according to the determinate bandwidth. And the wavelet
packet energy method was used to ascertain the frequency band
containing the most energy. Afterwards the corresponding
decomposition coefficients were extracted to reconstruct the signal.
Moreover, the Wavelet Ridge method was employed to demodulate the
reconstructed signal. The fault characteristic frequency was
effectively extracted from envelope spectrum and utilized to judge
the working conditions and fault type. At last, a deeply analyze on
fault signals of bearing inner ring and outer ring was carried out.
Results show that this proposed method can effectively extract the
characteristic frequency of fault signal.
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| DOI:10.12733/jics20105637 |
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