Abstract: In this article the significance of parameterized analysis model in airplane multidisciplinary design optimization (MDO) is discussed, and a method of parameterizing wing analysis model is presented. Interim variables between the optimization variables and the aerodynamic grids are designed and used to describe the change of the wing aerodynamic grids, and the relationship between the structure finite element model and the optimization variables is established; thus a parameteriazed model for aerodynamic and structrure MDO model is constructed. Computational fluid dynamics based on N-S equations is used for aerodynamic characteristic computation, and aerodynamic response surfaces are built by the design of experiment (DOE) and response surface model (RSM) technology for aerodynamic optimization.MSC/NASTRAN is used for structure analysis. A large-aspect-ratio wing of composite materials is optimized using Pareto genetic algorithm. A Pareto front and a number of feasible scenarios are obtained for selection by decisionmakers.

Key words: parameterized model, multidisciplinary design optimization, Pareto front, large-aspect-ratio wing