Rolling Element Bearing Fault Diagnosis Using Integrated Nonlocal Means Denoising with Modified Morphology Filter Operators

Figure 7

Simulated signal with high level Gaussian white noise: (a) waveform and (b) FFT spectrum of the simulated signal after DIF morphology analysis; (c) waveform and (d) FFT spectrum of the simulated signal after AVR morphology analysis; (e) waveform and (f) FFT spectrum of the simulated signal after Modified-DIF morphology analysis; (g) simulated signal after NLM denoising; (h) waveform; and (i) FFT spectrum of the simulated signal after Modified-DIF morphology-based NLM denoising analysis.

(a)

(b)

(c)

(d)

(e)

(f)

(g)

(h)

(i)