Fault Diagnosis of Bearings with Adjusted Vibration Spectrum Images

Table 3

Description of bearing datasets for single-fault severity detection.

Dataset	Training data	Testing data	The number of samples	Fault severity	Classification label
D1/D2/D3/D4	Load 0/Load 1/Load 2/Load 3	Load 0–3	50/50/50/50	Normal	1
			50/50/50/50	0.007 in	2
			50/50/50/50	0.014 in	3
			50/50/50/50	0.021 in	4
E1/E2/E3/E4	Load 0/Load 1/Load 2/Load 3	Load 0–3	50/50/50/50	Normal	1
			50/50/50/50	0.007 ball	2
			50/50/50/50	0.014 ball	3
			50/50/50/50	0.021 ball	4
F1/F2/F3/F4	Load 0/Load 1/Load 2/Load 3	Load 0–3	50/50/50/50	Normal	1
			50/50/50/50	0.007 out	2
			50/50/50/50	0.014 out	3
			50/50/50/50	0.021 out	4

Among the labels of fault severities, the so-called normal means the testing bearing is normal. 0.007 in means inner-race fault diameter of 0.007 inches; 0.007 ball means ball fault diameter of 0.007 inches; and 0.007 out means outer-race fault diameter of 0.007 inches, etc.