Research Article
A Fault Diagnosis Method for Rolling Bearings Based on Feature Fusion of Multifractal Detrended Fluctuation Analysis and Alpha Stable Distribution
Table 2
The MFDFA features of seven vibration signals.
| Operational status | | | | | |
| Normal (1) | 1.4725 | 1.2808 | 1.8472 | 0.5664 | 0.3800 | 1.4722 | 1.2654 | 1.8168 | 0.5514 | 0.2748 | 1.4877 | 1.2772 | 1.8705 | 0.5933 | 0.3545 | 1.4799 | 1.2853 | 1.8272 | 0.5419 | 0.2783 | 1.4800 | 1.2574 | 1.8204 | 0.5629 | 0.2135 |
| Slight inner-race faults (2) | 0.6210 | 0.3895 | 1.0487 | 0.6592 | 0.5408 | 0.6206 | 0.3845 | 1.0313 | 0.6468 | 0.5008 | 0.6211 | 0.3975 | 1.0288 | 0.63145 | 0.5117 | 0.6258 | 0.3873 | 1.0008 | 0.6136 | 0.3667 | 0.6169 | 0.3924 | 1.0073 | 0.6149 | 0.4744 |
| Serious inner-race faults (3) | 0.4979 | 0.1277 | 1.1092 | 0.9815 | 0.3466 | 0.5089 | 0.1648 | 1.1146 | 0.9498 | 0.4304 | 0.4974 | 0.1403 | 1.1050 | 0.9648 | 0.3707 | 0.5001 | 0.1439 | 1.0918 | 0.9479 | 0.3793 | 0.5020 | 0.1406 | 1.1218 | 0.9812 | 0.3815 |
| Slight outer-race faults (4) | 0.7213 | 0.4941 | 1.0430 | 0.5488 | 0.2776 | 0.7266 | 0.5327 | 1.0283 | 0.4956 | 0.3233 | 0.7145 | 0.5035 | 1.0283 | 0.5249 | 0.3175 | 0.7342 | 0.5209 | 1.0896 | 0.5688 | 0.4295 | 0.7380 | 0.5308 | 1.0284 | 0.4976 | 0.2593 |
| Serious outer-race faults (5) | 0.6497 | 0.2285 | 1.2242 | 0.9957 | 0.3342 | 0.6627 | 0.2446 | 1.1853 | 0.9407 | 0.2665 | 0.6344 | 0.2275 | 1.1913 | 0.9638 | 0.3470 | 0.6567 | 0.2769 | 1.2264 | 0.9494 | 0.4663 | 0.6442 | 0.2652 | 1.1654 | 0.9002 | 0.3383 |
| Slight ball faults (6) | 0.8228 | 0.5595 | 1.1391 | 0.5796 | 0.1190 | 0.8236 | 0.5575 | 1.1098 | 0.5523 | 0.0146 | 0.8184 | 0.5595 | 1.1428 | 0.5833 | 0.1309 | 0.8178 | 0.5507 | 1.0857 | 0.5350 | ā0.0412 | 0.8225 | 0.5657 | 1.1536 | 0.5879 | 0.1741 |
| Serious ball faults (7) | 0.6992 | 0.2357 | 1.2144 | 0.9787 | 0.0401 | 0.6995 | 0.2265 | 1.2210 | 0.9945 | 0.0243 | 0.6966 | 0.2496 | 1.2081 | 0.9584 | 0.0908 | 0.6901 | 0.2328 | 1.2155 | 0.9827 | 0.0868 | 0.6978 | 0.2295 | 1.2201 | 0.9906 | 0.0592 |
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