CEEMDAN-Based Permutation Entropy: A Suitable Feature for the Fault Identification of Spiral-Bevel Gears

Table 1

Correlation coefficient.

IMF component	Correlation coefficient
IMF1	0.731
IMF2	0.634
IMF3	0.506
IMF4	0.292
IMF5	0.176
IMF6	0.184
IMF7	0.079
IMF8	0.013
IMF9	0.0031
IMF10	0.0059
IMF11	0.0035
IMF12	−8.68e-04
IMF13	7.35e-04