Table 4 Extracted features for bearing RUL prediction.
Number | Time domain features | Number | Frequency domain features |
|---|---|---|---|
1–3 | Mean | 19–24 | \(A_m^{BPFO_i}{(t)}\) (i = 1,2,3) |
4–6 | Standard deviation | 25–30 | \(A_m^{BPFI_i}{(t)}\) (i = 1,2,3) |
7–9 | Sknewness | 31–32 | \(\sum _{i=1}^{3}A_m^{BPFI_i}(t)\) |
10–12 | Kurtosis | 33–34 | \(\sum _{i=1}^{3}A_m^{BPFO_i}(t)\) |
13–15 | Peak-to-peak value | 35–36 | \(\sum _{t=0}^{t}\sum _{i=1}^{3}A_m^{BPFI_i}(t)\) |
16–18 | Root mean square | 37–38 | \(\sum _{t=0}^{t}\sum _{i=1}^{3}A_m^{BPFO_i}(t)\) |
