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

Figure 8

The denoising effect with sampling integral on signal with white noise.

(a) Original signal

(b) Original signal with white noise

(c) The signal disposed with fifth sampling integral

(d) The signal disposed with tenth sampling integral

(e) Phase portrait of Duffing system with the signal disposed with fifth sampling integral

(f) Phase portrait of Duffing system with the signal disposed with tenth sampling integral