Intelligent Roller Bearing Fault Diagnosis in Industrial Internet of Things

Table 1

Centre frequency under different k values in VMD.

K	Centre frequency (kHz)
	BL-IMF1	BL-IMF2	BL-IMF3	BL-IMF4	BL-IMF5	BL-IMF6
2	0.0027	0.0820	—	—	—	—
3	0.0022	0.0883	0.0621	—	—	—
4	0.0022	0.0888	0.0669	0.0574	—	—
5	0.0020	0.0869	0.0636	0.0582	0.0510	—
6	0.0020	0.0798	0.0943	0.0603	0.0510	0.0513