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

Table 1

Features and corresponding formulas.

Feature	Formula
Mean absolute value (MAV)
Maximum
Variance
Skewness
Shape factor
Clearance factor
Average frequency
Frequency skew
RMS
Peak-to-peak
Square mean root (SMR)
Kurtosis
Crest factor
Impulse factor
Standard deviation frequency (SDF)
Frequency kurtosis