Research Article

A Condition Monitoring Method of Hydraulic Gear Pumps Based on Multilevel Mechanism-Data Fusion

Table 1

Time-domain features.

FeatureEquationFeatureEquation

Maximum valueRoot mean square
Minimum valueSquare mean root
Peak valueCrest factor
Peak to peakPulse factor
Mean valueMargin factor
Mean absolute valueWaveform factor
VarianceKurtosis factor
Standard deviationSkewness factor