Abstract: Aiming at the problem of excessive vibration of the centrifugal pump under sand-water conditions, the vibration signal under abrasion failure was analyzed and studied through experiments. The LabVIEW virtual instrument platform was used to build the test loop, and the model IS145-78 single-stage double-suction centrifugal pump was selected as the test object. During the test, yellow river sand was added to the water tank to measure the vibration signals of the driving end and the non-driving end at different times and flow rates. The vibration signal was analyzed in the time domain and frequency domain, and the vibration characteristics of the centrifugal pump under abrasion failure were obtained. The research results show that abrasion causes the reduction of lift and efficiency. From time-domain analysis, it can be seen that the root-mean-square vibration of the abrasion fault increases significantly in all directions, but the root-mean-square vibration is the lowest at the design point. From the frequency domain analysis, it is found that the vibration energy is mainly concentrated at the shaft frequency f0 under different flow rates, and the vibration energy at the leaf frequency fBPF gradually decreases with the increase of the flow rate. Studying the vibration characteristics of double-suction centrifugal pumps in abrasion operation can provide a certain reference for fault monitoring of centrifugal pumps.

Key words: centrifugal pump; abrasion failure; vibration characteristic; time domain analysis; frequency domain analysis;failure monitoring

FU Tian, MA Jian-zuo. Vibration characteristic analysis of centrifugal pump under abrasion failure［J］.Journal of Mechanical & Electrical Engineering, 2021,38(11):1501-1505,1512.