Milling Tool Wear State Recognition by Vibration Signal Using a Stacked Generalization Ensemble Model

Table 6

The detailed information of selected main features.

Signal	Features	Number of features	Total
X-directional vibration signal	Mean, RMS, amplitude of TPF	8, 2, 1	3
Y-directional vibration signal	Mean, peak, RMS, variance, skewness, amplitude of TPF, IMF1	11, 4, 10, 9, 7, 3, 5	7
Z-directional vibration signal	Peak, RMS	6, 12	2