Finite element model updating based on Kriging model and MOGA

Abstract

The accurate finite element model can precisely predict the structural dynamics response. A model updating method integrating the Kriging model and multi objective genetic algorithm (MOGA) is adopted for the model correction of GARTEUR aircraft. Firstly, the initial parameters of the aircraft model are screened using Spearman correlation analysis and the introduction of a significance level coefficient. And then, the screened parameters are used as design variables to obtain the initial sample points using the optimal space-filling(OSF) design method,construct the Kriging response surface model, and use the difference between the response surface calculation results and experimental results as the objective function. Finally, the MOGA is used to optimize the objective function, search for the Pareto optimal solution, and add validation points to the candidate points to check its accuracy.The results show that the updated GARTEUR aircraft model has good frequency reproduction and prediction capability, can meet the engineering accuracy requirements. The model updating method using Kriging model and MOGA is effective and reliable.

Keywords

• finite element model
• correlation analysis
• optimal space-filling
• kriging model
• moga