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)1.47251.28081.84720.56640.3800
1.47221.26541.81680.55140.2748
1.48771.27721.87050.59330.3545
1.47991.28531.82720.54190.2783
1.48001.25741.82040.56290.2135

Slight inner-race faults (2)0.62100.38951.04870.65920.5408
0.62060.38451.03130.64680.5008
0.62110.39751.02880.631450.5117
0.62580.38731.00080.61360.3667
0.61690.39241.00730.61490.4744

Serious inner-race faults (3)0.49790.12771.10920.98150.3466
0.50890.16481.11460.94980.4304
0.49740.14031.10500.96480.3707
0.50010.14391.09180.94790.3793
0.50200.14061.12180.98120.3815

Slight outer-race faults (4)0.72130.49411.04300.54880.2776
0.72660.53271.02830.49560.3233
0.71450.50351.02830.52490.3175
0.73420.52091.08960.56880.4295
0.73800.53081.02840.49760.2593

Serious outer-race faults (5)0.64970.22851.22420.99570.3342
0.66270.24461.18530.94070.2665
0.63440.22751.19130.96380.3470
0.65670.27691.22640.94940.4663
0.64420.26521.16540.90020.3383

Slight ball faults (6)0.82280.55951.13910.57960.1190
0.82360.55751.10980.55230.0146
0.81840.55951.14280.58330.1309
0.81780.55071.08570.5350āˆ’0.0412
0.82250.56571.15360.58790.1741

Serious ball faults (7)0.69920.23571.21440.97870.0401
0.69950.22651.22100.99450.0243
0.69660.24961.20810.95840.0908
0.69010.23281.21550.98270.0868
0.69780.22951.22010.99060.0592