Bearing Fault Prognosis Method Based on Priori Knowledge-Enhanced Particle Filter

Figure 7

The RMS value time-domain waveform was obtained by calculating the data from four sampling channels. (a) RMS value of channel 1. (b) RMS value of channel 2. (c) RMS value of channel 3. (d) RMS value of channel 4.

(a)

(b)

(c)

(d)