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Acta Armamentarii ›› 2020, Vol. 41 ›› Issue (1): 40-48.doi: 10.3969/j.issn.1000-1093.2020.01.005

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Uncertainty Quantification Analysis of Solid Rocket Motor Grain Ignition at Low Temperature Based on Improved PolynomialChaos Expansion

LI Yangtian1,2, LI Haibin2, WEI Guangmei2, WENG Jiexin3   

  1. (1.College of Statistics and Mathematics, Inner Mongolia University of Finance and Economics, Hohhot 010070, Inner Mongolia, China; 2.College of Science, Inner Mongolia University of Technology, Hohhot 010051, Inner Mongolia, China; 3.Inner Mongolia Dynamical Machine Academy, Hohhot 010010, Inner Mongolia, China)
  • Received:2019-04-08 Revised:2019-04-08 Online:2020-02-22

Abstract: In the process of computing the polynomial chaos expansion (PCE) coefficients based on projection method, an improper PCE order and Gauss point number may lead to overfitting and underfitting problems, which impacts the computing accuracy of PCE surrogate model seriously. An improved PCE method is presented to avoid overfitting and underfitting. In the improved PCE method, the adaptive PCE order P* is determined, the adaptive uniform grid (N*)d is determined to compute the sensitivity indices of each input variable, and then an adaptive non-uniform grid is constructed based on obtained sensitivity indices to compute PCE coefficients. The proposed method is adopted to analyze an example of solid rocket motor ignition at low temperature, in which the effect of material parameter randomness on grain output response are studied and the probability distribution of output response is obtained. A more accurate result can be obtained by the proposed method, and the accuracy and efficiency of the proposed method are verified through comparing with traditional methods. Key

Key words: solidrocketmotorgrain, uncertaintyquantification, improvedPCEmetamodel, globalsensitivityanalysis, non-uniformgrid

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