Research Article
A Morphological Filtering Method Based on Particle Swarm Optimization for Railway Vehicle Bearing Fault Diagnosis
Table 7
The kurtosis values of collected operations of the rolling element fault signal.
| | Operator | Kurtosis |
| | Dilation | 1.88 | | Morphological gradient (MG) | 33.28 | | Open | 1.19 | | Difference filter (DIF) | 53.37 | | White top-hat transform (WTH) | 64.62 | | Close-open (CO) | 0.66 | | Combination morphological filter (CMF) | 1.06 | | Combination morphological filter hat (CMFH) | 24.88 | | Erosion | 2.12 | | Close | 1.22 | | Close and open average (AC&O) | 1.09 | | Black top-hat transform (BTH) | 119.38 | | Combination of WTH and positive BTH (CWTH&PBTH) | 35.23 | | Open-close (OC) | 1.18 | | CO and OC gradient (GCO&OC) | 43.63 | | Morphology gradient product operation (MGPO) | 3.66 |
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