A Research on Maximum Symbolic Entropy from Intrinsic Mode Function and Its Application in Fault Diagnosis

Table 4

Maximum symbol entropy of IMF1–3 from bearing data.

Fault type	Function	Average of maximum; symbol entropy	/%
Normal	IMF1	4.726	43.262
	IMF2	4.124	43.556
	IMF3	3.441	44.434
Inner fault; (0.178 mm)	IMF1	5.126	46.679
	IMF2	4.774	44.238
	IMF3	4.179	43.164
Inner fault; (0.356 mm)	IMF1	5.151	44.642
	IMF2	5.000	48.372
	IMF3	4.213	48.301
Inner fault; (0.533 mm)	IMF1	4.574	38.692
	IMF2	4.699	47.347
	IMF3	3.829	47.760
Outer fault; (0.178 mm)	IMF1	5.011	43.906
	IMF2	5.106	44.915
	IMF3	4.592	47.181
Outer fault; (0.356 mm)	IMF1	5.164	44.749
	IMF2	4.814	45.989
	IMF3	4.034	47.874
Outer fault; (0.533 mm)	IMF1	5.061	43.766
	IMF2	4.917	48.050
	IMF3	4.043	46.771
Rolling fault; (0.178 mm)	IMF1	4.894	41.712
	IMF2	4.600	44.209
	IMF3	3.898	47.894
Rolling fault; (0.356 mm)	IMF1	4.924	42.256
	IMF2	4.546	45.319
	IMF3	3.868	48.939
Rolling fault; (0.533 mm)	IMF1	5.015	42.467
	IMF2	4.759	46.901
	IMF3	3.999	46.247