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

Table 3

NMI under different component amplitudes.

Signal code	K	Normalized mutual information				Threshold range
S1	3	1.0000	0.1692	0.0663		(0.0641, 0.0663)
	4	1.0000	0.1685	0.0743	0.0641
S2	3	1.0000	0.2506	0.0930		(0.0605, 0.0930)
	4	1.0000	0.2504	0.1002	0.0605
S3	3	1.0000	0.3442	0.1902		(0.1644, 0.1902)
	4	1.0000	0.3439	0.1644	0.0756
S4	3	1.0000	0.1781	0.0579		No
	4	1.0000	0.1930	0.0658	0.0833