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

Figure 7

The results obtained by morphological analysis: (a) envelope extraction of the signal shown in Figure 5(a) by using the closing operator; (b) the optimal length of the SE; (c) the local maximum locations of the signal shown in Figure 7(a); and (d) the revised local maximum locations of the signal shown in Figure 7(c) by using the iterative local maximum selection.

(a)

(b)

(c)

(d)