Multifault Diagnosis of Rolling Element Bearings Using a Wavelet Kurtogram and Vector Median-Based Feature Analysis

Table 5

Performance comparison between conventional feature analysis approaches and the proposed feature analysis method in terms of the average classification accuracy and the true positive rate at a bearing crack size of 3 mm (unit: %).

	Shaft speed	TPR per bearing fault condition under 3 mm crack size								ACA
		DFB	BCI	BCO	BCR	BCOI	BCOR	BCIR	BCOIR
PCA	300 RPM	40.00	62.22	62.22	66.67	53.33	62.22	66.67	75.56	61.11
	350 RPM	57.78	55.56	28.89	91.11	44.44	68.89	31.11	55.56	54.17
	400 RPM	66.67	71.11	15.56	86.67	75.56	51.11	97.78	60.00	65.56
	450 RPM	86.67	86.67	26.67	91.11	33.33	75.56	95.56	80.00	71.94
	500 RPM	82.22	82.22	33.33	91.11	48.89	71.11	93.33	46.67	68.61
ICA	300 RPM	48.89	60.00	62.22	71.11	40.00	57.78	71.11	77.78	61.11
	350 RPM	42.22	51.11	13.33	86.67	35.56	73.33	57.78	40.00	50.00
	400 RPM	88.89	80.00	42.22	80.00	66.67	35.56	100.00	62.22	69.44
	450 RPM	88.89	82.22	28.89	88.89	53.33	82.22	95.56	73.33	74.17
	500 RPM	88.89	84.44	35.56	91.11	31.11	75.56	93.33	44.44	68.06
LDA	300 RPM	53.33	93.33	73.33	100.00	77.78	84.44	82.22	77.78	80.28
	350 RPM	82.22	91.11	71.11	86.67	77.78	86.67	80.00	88.89	83.06
	400 RPM	93.33	91.11	57.78	93.33	91.11	77.78	97.78	80.00	85.28
	450 RPM	88.89	91.11	77.78	100.00	86.67	95.56	100.00	71.11	88.89
	500 RPM	88.89	97.78	68.89	91.11	73.33	86.67	100.00	80.00	85.83
Proposed	300 RPM	53.33	80.00	62.22	100.00	75.56	80.00	82.22	80.00	76.67
	350 RPM	80.00	88.89	73.33	88.89	80.00	86.67	82.22	91.11	83.89
	400 RPM	91.11	91.11	60.00	93.33	93.33	82.22	100.00	82.22	86.67
	450 RPM	88.89	97.78	86.67	97.78	88.89	97.78	95.56	84.44	92.22
	500 RPM	88.89	97.78	64.44	91.11	75.56	91.11	100.00	80.00	86.11