| Abbreviation | Definition |
| PHM | prognostics and health management |
| PdM | predictive maintenance |
| RUL | remaining useful life |
| HI | health indicator |
| WT | wavelet transformation |
| DWT | discrete wavelet transformation |
| FT | Fourier transformation |
| WPD | wavelet packet decomposition |
| AE | autoencoder |
| FEAE | feature ensemble autoencoder |
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