An Enhanced VMD with the Guidance of Envelope Negentropy Spectrum for Bearing Fault Diagnosis

Figure 30

The meaningful modes iteratively extracted by the extension method: (a) mode 1, (b) mode 2, (c) mode 3, (d) mode 4, and (e) their Fourier spectra.

(a)

(b)

(c)

(d)

(e)