Research on minor rub-impact fault diagnosis methods based on EMD of vibro-acoustic signals

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Journal of Vibration and Shock ›› 2009, Vol. 28 ›› Issue (8) : 91-93.

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Research on minor rub-impact fault diagnosis methods based on EMD of vibro-acoustic signals

ZHANG Zhan-yi LIU Jie YING Huai-qiao LI Yun-gong YAO Zhao

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Abstract

According to properties of the rotor local run-impact fault and characteristics of the vibro-acoustic signals, a method is adopted to diagnose the minor local rub-impact fault of sliding bearings based on the Empirical Mode Decomposition (EMD) of vibro-acoustic signals. The rub-impact fault characteristics can be separated from rotating excitation signals automatically in that the EMD needs no fixed basic functions and adaptively adjusts with the signal properties. A rub-impact experiment of sliding bearings without lubrication was setup, vibration hologram measurements taken, and the time domain properties of the vibro-acoustic signal Intrinsic Mode Function (IMF) compared to the rotor radial displacements and bearing abutment accelerations. The rub-impact component is determined by comparing the IMF marginal spectrum to the frequency spectrum of the bearing abutment acceleration. It is proved that the method based on EMD of vibro-acoustic signals is effective to diagnose the rub-impact fault.

Key words

rub-impact / EMD / marginal spectrum / vibro-acoustic signal

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ZHANG Zhan-yi LIU Jie YING Huai-qiao LI Yun-gong YAO Zhao . Research on minor rub-impact fault diagnosis methods based on EMD of vibro-acoustic signals[J]. Journal of Vibration and Shock, 2009, 28(8): 91-93