Research on the Feature Selection of Rolling Bearings’ Degradation Features

Table 2

The time domain features and their similarity indexes of Case I and Case II based on RMS.

Names	Similarity indexes of Case I		Similarity indexes of Case II		Names	Similarity indexes of Case I		Similarity indexes of Case II
	DFD	CI (%)	DFD	CI (%)		DFD	CI (%)	DFD	CI (%)
	0.6728	0.81	0.9921	0.71		0.2197	98.47	0.1686	99.71
	0	1	0	1		0.1479	99.08	0.1091	99.93
	0.5084	82.18	0.6983	86.09		0.5291	80.55	0.5278	80.38
	0.2257	98.57	0.1286	99.89		0.2369	98.07	0.5278	80.38
	0.2171	98.68	0.2807	99.22		0.2033	91.24	0.2290	85.91
	0.4429	18.84	0.4999	85.98		0.8181	6.82	0.9877	50.30
	0.7190	94.20	0.9983	81.34		0.6013	6.12	0.9877	51.80
	0.5527	24.95	0.8647	1.00		0.4399	95.93	0.9759	90.58

Note: is a signal series for is the number of the data points.