关键词: Kriging模型, 可靠性优化设计, 组合模型, 0-1规划

Abstract: The feasibility of design optimization based on metamodel reliability highly depends on the accuracy of metamodel.The selection of correlation functions is vital to the accuracy of Kriging model in modeling process.The existing Kriging modeling methods do not account for any uncertainty in the form of the correlation function,which lead to an undesirable accuracy and robustness metamodel.To conquer the issue,a new Kriging ensemble modeling approach that considered the uncertainty in the model form of the correlation function was proposed.Before implementing the model selection,the expected improvement sampling strategy was used to construct different candidate Kriging models.The 0-1 programming was adopted to the model selection where redundant Kriging models were eliminated before constructing a new Kriging ensemble model.Then,the selected candidate Kriging models were combined as a final model.The proposed Kriging ensemble modeling approach was applied to a bridge-type amplification mechanism to illustrate its effectiveness.The results revealed that the proposed Kriging ensemble modeling method not only improved predictive accuracy,but also enhance the predictive robustness.

Key words: Kriging model, reliability-based design optimization, combinational model, 0-1 programming