Incipient cavitations fault diagnosis for a centrifugal pump based on multi-position noise analysis

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (7) : 39-44.

ZHOU Yunlong1,LV Yuanzheng2

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Abstract

Here,an analysis method of multi-position noise was proposed for studying a centrifugal pump’s noise when cavitations occurs to summarize its law and to apply this law in its incipient cavitations fault diagnosis.Several single directional microphones were attached to different positions of the pump,the high quality hydrodynamic noise was extracted by constructing several matrices and their singular value decomposition.According to Lighthill acoustics theory,the hydrodynamic noise reflects changes of the flow field near the placed microphones.In order to speed up the calculation and reduce the memory,energy spectra of all positions of hydrodynamic noise were extracted with the second generation wavelet transformation,then the feature vectors were constructed with the sensitive frequency bands of all measured points to train a BP artificial neural network.The diagnosis results showed that the success rate of the multi-position noise analysis method is 93.5%,and it is fast and stable,it is more suitable for industrial application than the traditional noise diagnosis method be.

Key words

centrifugal pump / cavitations / hydrodynamic noise / singular value decomposition (SVD) second generation wavelet

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ZHOU Yunlong1,LV Yuanzheng2. Incipient cavitations fault diagnosis for a centrifugal pump based on multi-position noise analysis[J]. Journal of Vibration and Shock, 2017, 36(7): 39-44

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