Table 3.

The CCs between the noisy signal and IMFs by VMD and 2VMD.

	IMF 1	IMF 2	IMF 3	IMF 4	IMF 5	IMF 6	IMF 7	IMF 8	IMF 9
VMD	0.1438	0.1336	0.1592	0.1465	0.1583	0.1479	0.2417	0.4378	0.6721
2VMD	0.2205	0.0922	0.0927	0.0913	0.4204	0.3935	0.6673	−	−