Table 1.
Original features extracted from the de-noised vibration signals.
| Type | Time-Domain | Frequency-Domain | Time-Frequency-Domain |
|---|---|---|---|
| Dimensional indicator | F1: Standard deviation | F12: HAS-BPFO | F21–F28: E of eight bands |
| F2: Peak-Peak | F13: HAS-BPFI | - | |
| F3: Mean-absolute | F14: HAS-BSF | - | |
| F4: Root mean square | F15: HASS | - | |
| F5: Std of IHC | F16: HES-BPFO | - | |
| F6: Std of IHS | F17: HES-BPFI | - | |
| - | F18: HES-BSF | - | |
| - | F19: HESS | - | |
| Non-dimensional indicator | F7: Shape factor | F20: PMM | F29–F36: ER of eight bands |
| F8: Crest factor | - | - | |
| F9: Impulse factor | - | - | |
| F10: Skewness | - | - | |
| F11: Kurtosis | - | - |