Fault Diagnosis of Hydraulic Pumps Using PSO-VMD and Refined Composite Multiscale Fluctuation Dispersion Entropy

Table 2

Correlation coefficients.

IMF	1	2	3	4	5	6	7	8	Average
Correlation coefficient	0.1232	0.1873	0.4628	0.3893	0.3167	0.4626	0.3734	0.3742	0.3362