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Study on Application of EMD and HOC in Fault Diagnosis for Rolling Bearings
YANG Wei-xin;JIANG Qin-yu;WANG Zhen;GUO Fang
2011, 31 (5):
142-145.
DOI: 10.3969/j.issn.1006-1355-2011.05.033
Resonant demodulation is one of the most commonly used methods for rolling bearing fault diagnosis. However, this method is less effective sometimes since the early fault signal contains strong background noise. In this paper, a new denoising method based on empirical mode decomposition (EMD) and high-order cumulative quantities (HOC) is proposed. Fault signals are firstly decomposed into several intrinsic mode functions and then each function is analyzed and reconstructed using higher-order cumulative quantities. Finally, the fault characteristics of rolling bearing are extracted by using resonance demodulation. A practical example of fault diagnosis shows that this method has more preponderant than the traditional resonance demodulation method.
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