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

Table 9

NMI under different noise amplitudes.

Signal code	K	Normalized mutual information				Threshold range
S13	3	1.0000	0.2450	0.1165		(0.0753, 0.1165)
	4	1.0000	0.2450	0.0753	0.1513
S14	3	1.0000	0.1688	0.0452		(0.0431, 0.0452)
	4	1.0000	0.1784	0.0431	0.0505
S15	3	1.0000	0.1716	0.0708		(0.0634, 0.0708)
	4	1.0000	0.1672	0.0634	0.0552
S16	3	1.0000	0.1439	0.0586		(0.0532, 0.0586)
	4	1.0000	0.0693	0.0729	0.0532