Rotating Machine Fault Diagnosis Based on Optimal Morphological Filter and Local Tangent Space Alignment

Figure 4

Comparison of denoising results obtained by the optimal filter (0, 0.01, 0), the morphological filter of flat SE (0, 0, 0), and the wavelet of Morlet (with set to 5, equal to set to 0.3), for the vibration signal of a roller bearing with an inner-race fault: (a) the original signal, (b) the wavelet of Morlet, (c) the morphological filter of flat SE, and (d) the optimal filter.

(a)

(b)

(c)

(d)