Comparison of Support Vector Machine-Based Techniques for Detection of Bearing Faults

Table 1

Calculation formulas of eigenvalue indicators.

Basic eigenvalue indicators	Calculation formulas	Eight eigenvalue indicators	Calculation formulas
Mean		Waveform indicator
Root-mean-square value		Peak indicator
Square root amplitude		Pulse indicator
Absolute average		Margin indicator
Skew value		Skewness indicator
Kurtosis value		Kurtosis indicator
Variance		Square root amplitude
Maximum		Variance indicator

is the collected signal points, .