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

Table 7

NMI under different components number.

Signal code	K	Normalized mutual information							Threshold range
S9	3	1.0000	0.0508	0.0436					No
	4	1.0000	0.0560	0.0543	0.0502
S10	4	1.0000	0.0772	0.0472	0.0577				(0.0429, 0.0472)
	5	1.0000	0.0728	0.0688	0.0695	0.0429
S11	5	1.0000	0.0734	0.0610	0.0530	0.0670			(0.0458, 0.0469)
	6	1.0000	0.0694	0.0607	0.0458	0.0469	0.0500
S12	6	1.0000	0.0740	0.0544	0.0530	0.0534	0.0594		(0.0500, 0.0511)
	7	1.0000	0.0771	0.0654	0.0511	0.0678	0.0500	0.0544