Bearing Fault Feature Extraction Method Based on GA-VMD and Center Frequency

Figure 9

The characteristic distribution of envelope entropy of IMF of four kinds of bearing signals. (a) IMF1. (b) IMF2. (c) IMF3. (d) IMF4. (e) IMF5. (f) IMF6 (g). IMF7 (h). IMF8. (i) IMF9.

(a)

(b)

(c)

(d)

(e)

(f)

(g)

(h)

(i)