Table 4
Separability index η of various feature combinations and typical compound fault misjudgment rate.
| Feature combination | η(Discriminability index) | Misclassification rate (%) on critical composite faults (F4 and F5) |
|---|---|---|
| Current signal only | 1.8 | 42 |
| Vibration signal only | 2.7 | 31.5 |
| Acoustic signal only | 2.5 | 33 |
| Displacement signal only | 2.3 | 36 |
| Raw 4-modal fusion | 4.7 | 18 |
| Proposed method (full) | 6.2 | 8.5 |
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