Optimal Statistical Feature Subset Selection for Bearing Fault Detection and Severity Estimation

Table 1

List of statistical time-domain features.

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Feature

Notation and formula

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Mean T1 = 

Root mean square T2 = 

Root T3 = 

Maximum value T4 = 

Peak-to-peak T5 = 

Standard deviation T6 = 

Median T7 = 

25th percentiles T8 = 

75th percentiles T9 = 

Skewness T10 = 

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Kurtosis T11 = 

Crest factor T12 = 

Shape factor T13 = 

Impulse factor T14 = 

Clearance factor T15 = 

Skewness factor T16 = 

Kurtosis factor T17 = 

Geometric mean T18 = 

Root-sum-of-squares (RSSQ) T19 = 

Mean absolute deviation T20 = 

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Median absolute deviation T21 = 

Rate of zero crossing T22 = 

Entropy T23 = 

Histogram upper bound T24 = 

Histogram lower bound T25 = 

Activity T26 = 

Mobility T27 = 

Complexity T28 = 

Weibull negative log likelihood T29 = 

Normal negative log likelihood for single Gaussian T30 = 

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