Instantaneous Amplitude-Frequency Feature Extraction for Rotor Fault Based on BEMD and Hilbert Transform

Figure 4

The oil film oscillation signal: (a) the horizontal and vertical direction signals x; (b) the Fourier spectrum of signal x; (c) the vertical direction signals y; (d) the Fourier spectrum of signal y.

(a)

(b)

(c)

(d)