Acoustics Source Identification of Diesel Engines Based on Variational Mode Decomposition, Fast Independent Component Analysis, and Hilbert Transformation

Table 1

The correlation comparison of estimated source signals with mode parameter K.

	Correlation factors
	S1	S2	S3
K = 2	−0.998	−0.999	−0.999
K = 3	0.974	−0.076	0.894
K = 4 (selected from the proposed evaluation method)	0.998	0.996	0.934
K = 5	−0.996	−0.013	0.907
K = 6	−0.995	−0.989	0.094
K = 7	−0.994	−0.709	0.071
K = 8	0.988	0.695	0.011