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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2023, Vol. 44 ›› Issue (8): 227190-227190.doi: 10.7527/S1000-6893.2023.27190

• Solid Mechanics and Vehicle Conceptual Design • Previous Articles    

Data-model interactive remaining useful life prediction method for multi-sensor monitored linear stochastic degrading devices

Tianmei LI, Xiaosheng SI(), Jianxun ZHANG   

  1. Zhijian Laboratory,Rocket Force University of Engineering,Xi’an 710025,China
  • Received:2022-03-15 Revised:2022-05-10 Accepted:2022-05-25 Online:2022-06-09 Published:2022-06-09
  • Contact: Xiaosheng SI E-mail:sixiaosheng@126.com
  • Supported by:
    National Natural Science Foundation of China(62073336)

Abstract:

Advances in sensing and monitoring techniques enable real time acquisition of multi-sensor monitoring data of stochastic degrading devices. The effective fusion of these multi-sensor monitoring data to precisely predict the RUL in the prognostics field has drawn extensive attention. This paper presents a novel data-model interactive RUL prediction method for multi-sensor monitored linear stochastic degrading devices with a random failure threshold. In the offline training part, an optimization objective function synthesizing the mean squared error between the predicted and the actual life as well as the variance of the predicted life is constructed based on the composite health index extracted from historical multi-sensor data and the associated lifetime prediction via stochastic degradation modeling. A closed-loop feedback mechanism is thus established for composite health index constructing and stochastic degradation modeling. Based on this feedback mechanism, the fusion coefficients for multi-sensor data and the distribution parameters of the random failure threshold of the associated composite health index are optimized to enable automatic matching of the constructed composite health index with the adopted stochastic degradation model. In the online prediction part, the composite health index is first constructed based on the multi-sensor data of the device in service and then the linear stochastic degradation model is applied to track the degradation progression. To adapt the degradation model to the current status of the device, the Bayesian method is proposed to update the model parameters, and the RUL distribution considering the randomness of the failure threshold is subsequently derived according to the concept of the first passage time. Finally, we validate the proposed method by the multi-sensor data of aircraft gas turbine engines and the results indicate its merits in improving the properties of the composite health index and the accuracy of the prognosis.

Key words: multi-sensor monitoring, remaining useful life (RUL) prediction, data-model interaction, degradation modeling, linear stochastic model

CLC Number: