Table 2.
Features extracted from vibrations data.
| Feature Name | Original Size | ReliefF | RFE | SFAD |
|---|---|---|---|---|
| Fast Fourier Transform Averages | 32 | 4 | 2 | 0 |
| Mean of raw time series | 1 | 1 | 1 | 0 |
| Skewness of raw time series | 1 | 1 | 0 | 0 |
| Standard deviation of raw time series | 1 | 0 | 1 | 0 |
| Kurtosis of raw time series | 1 | 0 | 0 | 0 |
| Variance of raw time series | 1 | 0 | 0 | 0 |
| Mexican Hat coefficients | 64 | 8 | 5 | 0 |
| Coiflet wavelet coefficients | 64 | 6 | 2 | 0 |
| Kurtoses of wavelet approximations | 10 | 1 | 1 | 2 |
| Skewness of wavelet approximations | 10 | 1 | 0 | 2 |
| Kurtoses of wavelet details | 10 | 1 | 0 | 2 |
| Skewness of wavelet details | 10 | 0 | 1 | 2 |
| RMS of wavelet approximations | 10 | 1 | 0 | 2 |
| RMS of wavelet details | 10 | 1 | 1 | 2 |
| Crest factors of wavelet approximations | 10 | 1 | 1 | 2 |
| Crest factors of wavelet details | 10 | 0 | 0 | 2 |
| Total | 245 | 26 | 15 | 16 |