Rolling Bearing Reliability Assessment via Kernel Principal Component Analysis and Weibull Proportional Hazard Model

Figure 6

High test lifetime relative feature data (individual degradation stages).

(a) Time domain—RMS

(b) Time domain—peak-peak value

(c) Time domain—kurtosis

(d) Time domain—peak factor

(e) Frequency domain—spectrum mean

(f) Frequency domain—spectrum variance

(g) Frequency domain—spectrum RMS

(h) Time-frequency domain—E3

(i) Time-frequency domain—E7

(j) Time-frequency domain—S3

(k) Time-frequency domain—S7

(l) The time of data collection