Systems Engineering and Electronics ›› 2021, Vol. 43 ›› Issue (8): 2355-2361.doi: 10.12305/j.issn.1001-506X.2021.08.39

• Reliability • Previous Articles     Next Articles

Life prediction of bearings in rotating machinery based on grey model and LSTM network

Tao SHU1, Yichi ZHANG2,*, Rixian DING1   

  1. 1. Air Defense and Missile Defense College, Air Force Engineering University, Xi'an 710051, China
    2. Graduate School of Air Force Engineering University, Xi'an 710051, China
  • Received:2020-12-02 Online:2021-07-23 Published:2021-08-05
  • Contact: Yichi ZHANG

Abstract:

Rotating machinery account for 80 percent of the total large mechanical equipment. In order to grasp the working condition in time, the simulation research about how to improve the accuracy of life prediction for the bearings in rotating machineries is carried out. Firstly, the confidential value (CV) is used to quantify the evaluation of the working status. Then, the method of data transformation and cumulative integration is used to optimize the smoothness of the data and the background value to improve the grey model. And the long-short term memory network (LSTM) is combined with a new prediction model to predict the working state of bearings. Finally, the average absolute percentage error and other two performance indicators are compared with the single models, and the predicted failure time is compared with fully convolutional layer neural network algorithm and unscented particle filter algorithm. The results show that the average value of the three indicators for predicting the degradation trend of the combined model is better than that of the three single models. The failure time predicted by the combined model is more accurate than the two improved algorithms.

Key words: rotating machinery, bearing, life prediction, prediction accuracy, grey model, long-short term memory (LSTM) network

CLC Number: 

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