Sparse Signal Representations of Bearing Fault Signals for Exhibiting Bearing Fault Features

Figure 15

The results obtained by morphological filtering: (a) envelope extraction of the signal shown in Figure 13(a) by using the closing operator; (b) the optimal length of the flat SE; (c) the local maximum locations of the signal shown in (a); and (d) the revised local maximum locations of the signal shown in (c).

(a)

(b)

(c)

(d)