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

Figure 6

The original data of maximum symbolic entropy from test samples A to D.

(a) Maximum symbolic entropy of sample A (numbers 0–60 are normal bearings, 61–120 are inner faults, 121–180 are rolling faults, and 181–240 are rolling faults, and all diameters of fault are 0.533 mm).

(b) Maximum symbolic entropy of sample B (numbers 0–60 are normal bearings, 61–120 are inner faults of 0.178 mm, 121–180 are inner faults of 0.356 mm, and 181–240 are inner faults of 0.533 mm).

(c) Maximum symbolic entropy of sample C (numbers 0–60 are normal bearings, 61–120 are outer faults of 0.178 mm, 121–180 are outer faults of 0.356 mm, and 181–240 are outer faults of 0.533 mm).

(d) Maximum symbolic entropy of sample D (numbers 0–60 are normal bearings, 61–120 are rolling faults of 0.178 mm, 121–180 are rolling faults of 0.356 mm, and 181–240 are rolling faults of 0.533 mm)