Figure 12.

Decomposition results of EEMD and PSO-VMD (for the signal in Figure 9b). (a) Results of EEMD ($\frac{{\sigma }_{\mathrm{e}}}{{\sigma }_0}=0.25$, 100 ensemble members); (b) results of VMD ($k_{\mathrm{v}}=14$, ${\alpha }_{\mathrm{v}}=63.1$).