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

Table 3

The ASD features of seven vibration signals.

Operational status
Normal (1)	2.0000	−1.0000	0.0530	0.0120	5.4785
	2.0000	−1.0000	0.0513	0.0104	5.5043
	2.0000	−1.0000	0.0517	0.0113	5.3190
	2.0000	−1.0000	0.0527	0.0119	5.4111
	2.0000	−1.0000	0.0528	0.0097	5.4430
Slight inner-race faults (2)	1.6510	0.0351	0.1676	0.0147	1.7729
	1.6462	0.0431	0.1667	0.0149	1.7670
	1.6439	0.0443	0.1663	0.0152	1.7762
	1.6412	0.0478	0.1659	0.0154	1.7890
	1.6482	0.0368	0.1681	0.0146	1.8081
Serious inner-race faults (3)	1.4628	−0.0055	0.2322	0.0113	1.1271
	1.4615	−0.0388	0.2323	0.0057	1.2140
	1.4572	−0.0244	0.2306	0.0081	1.0944
	1.4638	−0.0169	0.2342	0.0098	1.1112
	1.4571	−0.0134	0.2288	0.0102	1.0653
Slight outer-race faults (4)	1.1366	0.0144	0.1991	0.0319	2.3344
	1.1338	0.0024	0.1974	0.0215	2.3226
	1.1315	0.0232	0.1977	0.0384	2.3404
	1.1277	0.0210	0.1962	0.0371	2.2661
	1.1432	0.0368	0.1881	0.0146	2.2963
Serious outer-race faults (5)	1.0429	0.0300	0.1293	0.0586	1.4839
	1.0406	0.0427	0.1287	0.0864	1.4733
	1.0482	0.0313	0.1292	0.0544	1.4918
	1.0447	0.0265	0.1299	0.0498	1.4810
	1.0446	0.0394	0.1296	0.0735	1.4785
Slight ball faults (6)	1.9577	0.3325	0.0784	0.0225	3.8988
	1.9572	0.2264	0.0788	0.0209	3.8121
	1.9528	0.3042	0.0785	0.0197	3.8065
	1.9452	0.3021	0.0783	0.0182	3.9182
	1.9612	0.3226	0.0788	0.0217	3.8847
Serious ball faults (7)	1.7828	0.0582	1.3278	0.0125	3.4243
	1.7746	0.0608	1.3192	0.0034	3.4013
	1.7843	0.0667	1.3177	−0.0043	3.4117
	1.7920	0.0674	1.3194	−0.0094	3.4339
	1.7896	0.0644	1.3081	−0.0113	3.4218