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

Table 2

Distribution of the size range and the mean value of the overall sample entropy value.

Sample entropy	SampEn1	SampEn2	SampEn3	SampEn4
Numerical range	0.65–0.75	0.74–0.86	0.79–1.03	0.76–0.96
Mean value of the sample entropy	0.7	0.8	0.91	0.86