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) | |
|
|