The invention discloses an aero-engine
remaining life prediction method based on multi-stage
information fusion. The method comprises the steps that multi-source monitoring parameter denoising
processing and
feature extraction are conducted; stable analysis is conducted on multi-source monitoring time sequences, sudden
change points of all parameter monitoring time sequences are calculated and parameter degeneration proportions at the positions of the sudden
change points are calculated; multi-stage division is conducted on multi-source parameters, a regression fusion model is established, sample training is conducted by using historical
monitoring data and parameters, in
multiple stages, of the fusion model are obtained; according to
monitoring data in a
training set, the multi-source monitoring parameters are fused and a
health indicator HI is obtained; by using the
Kalman filtering algorithm, best fit is conducted on an engine in the whole process that the performance fails from being complete, and the error of a prediction model is minimized; according to real-time
monitoring data in a
test set, the multi-source monitoring parameters are fused and a
health indicator HI is obtained; time-varying parameters of the prediction model are estimated in real time by using the
Kalman filtering algorithm; the prediction model is determined, the time mechanism is introduced and the failure time of the engine is estimated in real time.