An Integrated Cumulative Transformation and Feature Fusion Approach for Bearing Degradation Prognostics

Figure 7

Eight wavelet packet energy features.

(a) WPE1

(b) WPE2

(c) WPE3

(d) WPE4

(e) WPE5

(f) WPE6

(g) WPE7

(h) WPE8