A Method for Determining Intrinsic Mode Function Number in Variational Mode Decomposition and Its Application to Bearing Vibration Signal Processing

Table 4

CC under different component frequencies.

Signal code	K	Correlation coefficient				Threshold range
S5	3	0.9250	0.2245	0.1007		(0.0578, 0.1007)
	4	0.8680	0.4345	0.2189	0.0578
S6	3	0.8649	0.4436	0.2149		(0.0536, 0.2146)
	4	0.8649	0.4436	0.2146	0.0536
S7	3	0.9502	0.2080	0.2160		(0.0591, 0.2080)
	4	0.8658	0.4403	0.2159	0.0591
S8	3	0.8660	0.4370	0.2242		(0.0540, 0.2239)
	4	0.8660	0.4370	0.2239	0.0540