| Citation: | HUANG Liang, LIU Junqiang, GONG Yingjieet al. Multi-phase residual life prediction of engines based on Wiener process[J]. Journal of Beijing University of Aeronautics and Astronautics, 2018, 44(5): 1081-1087. doi: 10.13700/j.bh.1001-5965.2017.0383(in Chinese)
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Due to the fact that the research on the life prediction of the engine does not take into account both the nonlinearity and the multi-stage problems at the present stage, a method for forecasting the residual life of aeroengines in real time based on multi-phase nonlinear Wiener process is proposed. This method can effectively fuse the historical performance degradation monitoring data of the same type of aeroengines with the real-time monitoring data of the individual aeroengine. Firstly, the nonlinearity of performance degradation is considered, and the multi-stage Wiener process was used to establish the performance degradation model of engine. Secondly, according to the historical performance monitoring data of the aeroengines, the prior distribution of parameters is estimated by using maximum likelihood estimation and one-dimensional search method. Thirdly, according to the real-time performance degradation data of individual aeroengine and the prior distribution, the Bayesian method is used to update the model parameters. Finally, the real-time predicted values of the residual life of the individual aeroengine are obtained. By the test of the actual data, the results show that the proposed method is accurate.
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