Fault Diagnosis of Pump Using EMD and Envelope Spectrum

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Journal of Vibration and Shock ›› 2012, Vol. 31 ›› Issue (9) : 44-48.

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Fault Diagnosis of Pump Using EMD and Envelope Spectrum

Tang Hong-bin1,2，Wu Yun-xin 1，Hua Guang-jun 1，Ma Chang-xun 1

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Abstract

On the basis of failure mechanism of pump and aiming at the difficulty in early fault diagnosis of pump, the fault characteristic signal is weak and the traditional envelope analysis need to to determine frequency bandwidth rely on experience. A fault diagnosis approch based on empirical mode decomposition(EMD) and envelope spectrum is proposed. According to the method, the vibration signal is decomposed into some intrinsic mode function (IMF) using EMD at first.Then the first IMF is envelope analyzed and the envelope spectrum is obtained which include the main fault information. Finally, the working conditions and fault types of the pump is determined by the analysis of the envelope spectrum. The experimental results show that the early fault characteristics of the pump is extracted effectively and four modes of no fault, slipper loosing fault, swashplate wearing fault and valve plate wearing fault are correctly identified.

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fault diagnosis of pump / empirical mode decomposition / envelope spectrum / Intrinsic Mode Function

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Tang Hong-bin;Wu Yun-xin;Hua Guang-jun;Ma Chang-xun . Fault Diagnosis of Pump Using EMD and Envelope Spectrum [J]. Journal of Vibration and Shock, 2012, 31(9): 44-48