Research Article
Multistep Degradation Tendency Prediction for Aircraft Engines Based on CEEMDAN Permutation Entropy and Improved Grey–Markov Model
Table 2
Description of the selected monitoring signals for the construction of IDI series.
| Index | Monitoring signal | Abbreviation | Unit |
| 1 | Total temperature at low-pressure compressor outlet | T24 | °R | 2 | Total temperature at high-pressure compressor outlet | T30 | °R | 3 | Total temperature at low-pressure turbine outlet | T50 | °R | 4 | Total pressure at high-pressure compressor outlet | P30 | psia | 5 | Static pressure at high-pressure compressor outlet | Ps30 | psia | 6 | Ratio of fuel flow to Ps30 | Phi | pps/psia | 7 | Bypass ratio | BPR | — |
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