Plunger pump cavitation fault recognition based on analysis of low frequency energy

The cavitation problem is a typical failure of plunger pumps, and it is difficult to be accurately identified due to the unobvious characteristics of the failure. To solve the above problems, firstly, the mechanism of cavitation failure is analyzed, and the influence of cavitation phenomenon on outlet pressure pulsation is obtained; then, in order to identify the outlet pressure characteristics, a cavitation failure identification method of plunger pump based on low-frequency energy analysis is introduced. Then, the high-speed plunger pump cavitation test is carried out under different cavitation degrees, and the pressure pulsation signal at the outlet of the plunger pump is collected. Finally, the energy integral sum and the relative energy integral sum in the specific side frequency interval of each harmonic component of the low frequency band are calculated, and the calculation result is used as a new characteristic quantity to characterize the different cavitation states of the plunger pump. The results show that the edge frequency energy integral sum has a high degree of discrimination for the cavitation state, which is suitable for the identification of the cavitation state.