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

Figure 11

The results obtained by morphological filtering: (a) envelope extraction of the signal shown in Figure 9(a) by using the closing operator; (b) the optimal length of SE; (c) the local maximum locations of the signal shown in Figure 11(a); and (d) the revised local maximum locations of the signal shown in Figure 11(c) by using the iterative local maximum selection.

(a)

(b)

(c)

(d)