An Enhancement Deep Feature Extraction Method for Bearing Fault Diagnosis Based on Kernel Function and Autoencoder

Table 1

Description of the intershaft operation conditions.

	Bearing operating condition	Motor speed (Hz); HR/LR	Size of training/testing samples	Label
ILR	Inner fault (LR)	0/20	150/50	1
IHR	Inner fault (HR)	20/0	150/50	2
IHLR	Inner fault (HLR)	20/20	150/50	3
OLR	Outer fault (LR)	0/20	150/50	4
OHR	Outer fault (HR)	20/0	150/50	5
OHLR	Outer fault (HLR)	20/20	150/50	6
RLR	Roller fault (LR)	0/20	150/50	7
RHR	Roller fault (HR)	20/0	150/50	8
RHLR	Roller fault (HLR)	20/20	150/50	9
NHLR	Normal (HLR)	20/20	150/50	10