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An interval finite element method based on bilevel Kriging model
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An interval finite element method based on bilevel Kriging model
This study introduces a new approach utilizing an interval finite element method com-bined with a bilevel Kriging model to determine the bounds of structural responses in the presence of spatial uncertainties.A notable benefit of this approach is its ability to determine the response bounds across all degrees of freedom with a small sample size,which means that it has high effi-ciency.Firstly,the spatially varying uncertain parameters are quantified using an interval field model,which is described by a series of standard interval variables within a truncated interval Karhunen-Loeve(K-L)series expansion.Secondly,considering that the bound of structural response is a function of spatial position with the property of continuity,a surrogate model for the response bound is constructed,namely the first-level Kriging model.The training samples required for this surrogate model are obtained by establishing the second-level Kriging model.The second-level Kriging model is established to describe the structural responses at particular loca-tions relative to the interval variables so as to facilitate the upper and lower bounds of the node response required by the first-level Kriging model.Finally,the accuracy and effectiveness of the method are verified through examples.
Interval fieldSpatial uncertaintyKriging modelInterval finite element analysisResponse bounds
State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body,College of Mechanical and Vehicle Engineering,Hunan University,Changsha 410082,China
Flight Automatic Control Research Institute of AVIC,Xi'an 710065,China
Agriculture Equipment Institute of Hunan,Hunan Academy of Agricultural Sciences,Changsha 410125,China
Interval field Spatial uncertainty Kriging model Interval finite element analysis Response bounds
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