Multistep Degradation Tendency Prediction for Aircraft Engines Based on CEEMDAN Permutation Entropy and Improved Grey–Markov Model

Figure 11

Comparisons of actual IDI and IGMMW forecasting values for four RIMFs: (a) RIMF1, (b) RIMF2, (c) RIMF3, and (d) RIMF4.

(a)

(b)

(c)

(d)