Fault Diagnosis of Hydraulic Pumps Using PSO-VMD and Refined Composite Multiscale Fluctuation Dispersion Entropy

Figure 10

Time domain waveforms of denoised vibration signals. (a) Normal working state. (b) Single plunger loose slipper. (c) Double plungers loose slipper. (d) Piston shoe wear.

(a)

(b)

(c)

(d)