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

Table 1

Sample entropy values of each IMF.

State of the gear	Signal sequence	SampEn1	SampEn2	SampEn3	SampEn4
G1	1	0.6542	0.7433	0.8416	0.8176
	2	0.7151	0.7666	0.8174	0.7689
	3	0.7224	0.7483	0.7932	0.8600
	4	0.7105	0.7698	1.1610	0.8194
G2	1	0.6871	0.7919	0.9700	1.0353
	2	0.6903	0.7964	0.9545	0.9600
	3	0.6847	0.8094	0.9436	0.9389
	4	0.7001	0.7999	0.8822	0.9433
G3	1	0.7307	0.8161	0.9177	0.8973
	2	0.7500	0.7711	0.8560	0.8839
	3	0.7377	0.8300	0.8618	0.8748
	4	0.7186	0.8232	0.8580	0.8604
G4	1	0.6514	0.8357	0.9759	0.7661
	2	0.6679	0.8478	1.0348	0.8100
	3	0.6622	0.8590	1.1180	0.7844
	4	0.6198	0.7533	0.9809	0.8218