Research Article
Fault Prediction of Centrifugal Pump Based on Improved KNN
| Evaluation index | Formula | Significance of evaluation |
| RMS | | Represents the average amount of signal amplitude based on a unit of time | Kurtosis coefficient | | It can express the difference between the signal and its average value at this time | Peak factor | | Dynamic expression of the damage to the surface of the machine seal | Pulse factor | | The ratio of the peak value to the mean value of the signal, the criterion for judging the presence of an impact in the signal | Waveform factor | | Based on the upper root mean square value and the mean value ratio of the time-domain | Kurtosis | | The amplitude of the seal acoustic emission signal is described. If the kurtosis is too large, it means that there is a dry friction | Margin coefficient | | The ratio of the signal root means a square value to its mean value, used to evaluate the degree of component damage | Skew coefficient | | The asymmetry degree of acoustic emission signal is described | Center frequency | | Denotes the change in the position of the power spectrum barycenter and describes the change of the energy ratio of each frequency component | MSF | | Represents the discrete state of power spectrum energy distribution and describes the composition of signal frequency components |
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