A Fault Diagnosis Method for Rolling Bearings Based on Feature Fusion of Multifractal Detrended Fluctuation Analysis and Alpha Stable Distribution

Table 1

The detailed descriptions of seven vibration signals.

Data label	Operational status	Fault size (mm)	Speed (r/min)	Sampling frequency (kHZ)
1	Normal	0	1797	12
2	Slight inner-race faults	0.18	1797	12
3	Serious inner-race faults	0.54	1797	12
4	Slight outer-race faults	0.18	1797	12
5	Serious outer-race faults	0.54	1797	12
6	Slight ball faults	0.18	1797	12
7	Serious ball faults	0.54	1797	12