Evaluation on Filter Performance of Variational Mode Decomposition and Its Application in Separating Closely Spaced Modes

Figure 6

The averaged Fourier spectra of extracted modes for VMD realizations, in the case of three typical Hurst exponents: (a) H = 0.2, (b) H = 0.5, and (c) H = 0.8. The center frequencies were initialized randomly, for three different values of α (α = 1e3 (blue lines), 1e4 (red lines), and 1e5 (yellow lines)). The dashed lines denote the averaged spectra illustrated in Figure 1 in the case of α = 1e3.