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Based on the Hilbert-Huang transform (HHT), a method for time-frequency feature extraction from vibration signals was introduced into fault diagnosis of rotors. Firstly, the empirical mode decomposition (EMD) was implemented on vibration signals measured by sensors. As a result, a set of components with different time scales, i.e. intrinsic mode function (IMF), was extracted. Then, the Hilbert Transformation...
This paper introduced the good characteristic of morphological filter and its application in purification of rotor centerpsilas orbit. Using the combination of morphological open-closing and close-opening operations, the local characteristic of the original signal could be kept and noise interferences could be eliminated effectively, then the rotor centerpsilas orbit could be purified successfully...
Dynamic faults of induction machines cause modulation. The main frequencies of modulating signals are rotation frequency at dynamic eccentricity and slip pole frequency at broken rotor bars or frame. Demodulation methods increase resolution both in magnitude region and frequency region, facilitate and precise evaluation. The paper introduces the basics of envelope analysis and two demodulation methods...
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