λ机翼气动/结构多学科设计与优化

Multidisciplinary Aerodynamic/Structural Design and Optimization of theλWing

机翼锯齿状后缘的气动外形设计增大了展弦比,进而提高了空气动力学效率,但同时也导致结构质量的增加。因此,本文提出了一种针对战斗机类λ机翼的气动/结构多学科设计优化方法,关键步骤包括机翼外形和结构参数化建模、气动分析模型自动生成与外形优化、结构有限元模型自动生成与结构布局/尺寸优化。在ISIGHT软件环境下集成气动、结构优化模块,利用基于代理模型的多级优化方法求解λ机翼气动/结构多目标优化问题。算例结果表明,本文提出的优化方法能够较好地兼顾了λ机翼的气动和结构性能,进而提高初步设计阶段的效率。

The aerodynamic shape design of the serrated trailing edge for the Lambda(λ)wing increases the aspect ratio and improves the aerodynamic efficiency,however,this results in a greater structural mass.Therefore,an aerodynamic/structural multidisciplinary design optimization method is proposed for theλwing of fighters.The key steps include parametric modeling for wing configuration and structural layout,automatic generation of the wing aerodynamic model and aerodynamic optimization,automatic generation of the wing structural finite element model and the wing structural layout/size optimization.The aerodynamic and structural optimization modules are integrated in the ISIGHT software environment,and the multi-level optimization method based on the surrogate model is used to solve the multi-objective optimization problem.The example results show that the optimization method can better take both the aerodynamic and structural performance into account of theλwing.Thus,the proposed approach can further improve the efficiency of the preliminary design.