Research Article
A Morphological Filtering Method Based on Particle Swarm Optimization for Railway Vehicle Bearing Fault Diagnosis
Table 1
The classical operations and corresponding expressions.
| | Name | Expression | Name | Expression |
| | Morphological gradient (MG) | | Difference filter (DIF) | | | Black top-hat transform (BTH) | | Close and open average (AC&O) | | | White top-hat transform (WTH) | | Open-close (OC) | | | Combination of WTH and positive BTH (CWTH&PBTH) | | Close-open (CO) | | | Combination morphological filter (CMF) | | CO and OC gradient (GCO&OC) | | | Combination morphological filter hat (CMFH) | | Morphology gradient product operation (MGPO) | |
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