A Fault Diagnosis Method of Train Wheelset Rolling Bearing Combined with Improved LMD and FK

Table 2

The correlation coefficients for PF components.

Method	Correlation coefficients
	PF1 (impact signal)	PF2 (sinusoidal signal)	PF3 (sinusoidal signal)
ICIE LMD	0.985	0.466	0.749
CSI LMD	0.973	0.036	0.598
CIE LMD	0.984	0.445