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

Table 6

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 12 mm (unit: %).

	Shaft speed	TPR per bearing fault condition under 12 mm crack size								ACA
		DFB	BCI	BCO	BCR	BCOI	BCOR	BCIR	BCOIR
PCA	300 RPM	84.44	75.56	64.44	66.67	86.67	95.56	71.11	75.56	77.50
	350 RPM	95.56	53.33	75.56	71.11	77.78	88.89	80.00	95.56	79.72
	400 RPM	93.33	73.33	86.67	82.22	75.56	91.11	95.56	97.78	86.94
	450 RPM	91.11	77.78	88.89	73.33	91.11	95.56	91.11	91.11	87.50
	500 RPM	88.89	95.56	91.11	86.67	95.56	93.33	91.11	93.33	91.94
ICA	300 RPM	51.11	48.89	86.67	66.67	71.11	93.33	71.11	64.44	69.17
	350 RPM	64.44	42.22	88.89	71.11	86.67	91.11	77.78	91.11	76.67
	400 RPM	88.89	62.22	88.89	75.56	75.56	88.89	91.11	97.78	83.61
	450 RPM	100.00	48.89	93.33	68.89	88.89	97.78	93.33	88.89	85.00
	500 RPM	91.11	88.89	91.11	84.44	97.78	93.33	88.89	95.56	91.39
LDA	300 RPM	77.78	88.89	82.22	93.33	95.56	100.00	97.78	88.89	90.56
	350 RPM	91.11	100.00	91.11	93.33	100.00	100.00	97.78	100.00	96.67
	400 RPM	95.56	100.00	97.78	95.56	100.00	100.00	97.78	97.78	98.06
	450 RPM	100.00	100.00	97.78	93.33	97.78	100.00	100.00	97.78	98.33
	500 RPM	91.11	100.00	100.00	97.78	100.00	97.78	100.00	100.00	98.33
Proposed	300 RPM	80.00	86.67	88.89	93.33	93.33	100.00	97.78	88.89	91.11
	350 RPM	91.11	100.00	88.89	93.33	100.00	100.00	100.00	100.00	96.67
	400 RPM	95.56	100.00	97.78	97.78	100.00	100.00	100.00	100.00	98.89
	450 RPM	100.00	100.00	100.00	97.78	97.78	100.00	100.00	100.00	99.44
	500 RPM	93.33	100.00	100.00	97.78	100.00	97.78	100.00	100.00	98.61