Fractional Order Derivative and Time-Delay Feedback Enabled Stochastic Resonance for Bearing Fault Diagnosis

Figure 5

The enhanced result and its spectrum using the proposed method and underdamped SR without both fractional derivative and time-delay feedback: (a) time-domain signal and (b) its zoomed frequency spectrum using the proposed method and (c) time-domain signal and (d) its zoomed frequency spectrum using underdamped SR without both fractional derivative and time-delay feedback.

(a)

(b)

(c)

(d)