A D-vine copula-based coupling uncertainty analysis method for the stiffness predication of variable-stiffness composite

作     者：Li, Qidi Wang, Hu Zeng, Yang Lv, Zhiwei 

作者机构：State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University China Joint Center for Intelligent New Energy Vehicle China 

出 版 物：《arXiv》 (arXiv)

年 卷 期：2018年

核心收录：

主　　题：Random variables 

摘      要：This study suggests a coupling uncertainty analysis method to investigate the stiffness characteristics of variable-stiffness (VS) composite. The D-vine copula function is used to address the coupling of random variables. To identify the copula relation between random variables, a novel one-step Bayesian copula model selection (OBCS) method is proposed to obtain a suitable copula function as well as the marginal CDF of random variables. The entire process is Monte Carlo simulation (MCS). However, due to the expensive computational cost of complete finite element analysis (FEA) in MCS, a fast solver, reanalysis method is introduced. To further improve the efficiency of entire procedure, a back propagation neural network (BPNN) model is also introduced based on the reanalysis method. Compared with the reanalysis method, BPNN shows a higher efficiency as well as sufficient accuracy. Finally, the fiber angle deviation of VS composite is investigated by the suggested strategy. Two numerical examples are presented to verify the feasibility of this method. Copyright © 2018, The Authors. All rights reserved.