Gear Fault Diagnosis Based on VMD Sample Entropy and Discrete Hopfield Neural Network

Table 3

Numerical range and the mean value of SE1, SE2, SE3, and SE4 sample entropy values in various gear states.

State of the gear	G1	G2	G3	G4
Numerical range of SampEn1	0.70–0.72	0.67–0.70	0.72–0.75	0.65–0.67
Mean value of SampEn1	0.71	0.685	0.735	0.66
Numerical range of SampEn2	0.74–0.77	0.77–0.8	0.8–0.83	0.83–0.86
Mean value of SampEn2	0.755	0.785	0.815	0.845
Numerical range of SampEn3	0.79–0.85	0.97–0.97	0.85–0.91	0.97–1.03
Mean value of SampEn3	0.82	0.97	0.88	1
Numerical range of SampEn4	0.81–0.86	0.91–0.96	0.86–0.91	0.76–0.81
Mean value of SampEn4	0.835	0.935	0.885	0.785