Journal of System Simulation ›› 2021, Vol. 33 ›› Issue (6): 1342-1349.doi: 10.16182/j.issn1004731x.joss.20-0046

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Fault Diagnosis of Mechanical Equipment Based on GA-SVR with Missing Data in Small Samples

Wei Jingjing, Liu Qinming, Ye Chunming, Li Guanlin   

  1. Business School, University of Shanghai for Science and Technology, Shanghai 200093, China
  • Received:2020-01-15 Revised:2020-03-17 Online:2021-06-18 Published:2021-06-23

Abstract: In view of the equipment fault diagnosis with small and missing sample data, a method of missing data filling based on support vector regression optimized by genetic algorithm is proposed to improve the accuracy of equipment fault diagnosis. The support vector regression optimized by genetic algorithm was trained by other data values of missing data, and univariate prediction results were obtained. The training set was reconstructed through correlation analysis, so as to obtain the multivariate prediction results. Dynamic weights were established to combine univariate prediction results and multivariate prediction results to fill in the missing data. The complete data is taken as the input, and the equipment fault is diagnosed by support vector machine. Example analysis shows that the method proposed in this paper has a high fault diagnosis accuracy.

Key words: fault diagnosis, small sample, missing data, support vector machine, dynamic weight, combination prediction

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