Incipient Gearbox Fault Diagnosis Based on the Reverse State Transformation of the Chaotic Duffing Oscillator and Sampling Integral Technology

Figure 15

Frequent domain analysis.

(a) The frequency and spectrum diagram on normal state

(b) The frequency and spectrum diagram on normal state with its vibration signal disposed by fifth sampling integral and filter

(c) The frequency and spectrum diagram on 1 mm gear crack

(d) The frequency and spectrum diagram on 1 mm gear crack with its vibration signal disposed by fifth sampling integral and filter

(e) The frequency and spectrum diagram on 2 mm gear crack

(f) The frequency and spectrum diagram on 2 mm gear crack with its vibration signal disposed by fifth sampling integral and filter

(g) The frequency and spectrum diagram on 5 mm gear crack

(h) The frequency and spectrum diagram on 5 mm gear crack with its vibration signal disposed by fifth sampling integral and filter

(i) The frequency and spectrum diagram on 8 mm gear crack

(j) The frequency and spectrum diagram on 8 mm gear crack with its vibration signal disposed by fifth sampling integral and filter