Research Article
Milling Tool Wear State Recognition by Vibration Signal Using a Stacked Generalization Ensemble Model
Table 5
Extracted signal features.
| Measured signal | Direction | Time domain | Frequency domain | Time-frequency domain | Total |
| Vibration signal | X/Y/Z | Mean, peak, RMS, variance, kurtosis, and skewness | Amplitude of TPF | IMF1–IMF7 | 42 |
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