一种考虑气动弹性的运输机机翼多学科优化方法

A method of coupled aerodynamic/structural integration optimization for transport-wing design

探索了在运输机初步设计阶段的一种计及气动弹性的机翼气动/结构综合优化设计方法。该方法将试验设计方法与二次响应面、Kringing模型和神经网络等工程近似技术相结合,建立考虑气动弹性后的气动性能和结构性能的近似分析模型,在这些近似模型的基础上进行最优化设计。应用该方法进行了高亚声速运输机计及气动弹性的机翼气动/结构综合优化设计,设计结果表明:(1)近似模型精度满足工程设计要求,所设计的高亚声速运输机机翼具有较好的气动/结构综合性能,表明本文方法是可行的;(2)计及气动弹性的优化设计结果比不考虑气动弹性的优化设计结果性能有很大提高,说明对高亚声速运输机机翼设计来说,在初步设计阶段考虑气动弹性是很有必要的。

A new method was presented for coupled aerodynamic/structural integration optimization of transport wing. It was developed based on experiment design method and approximation techniques. Experiment design method was utilized to provide sample points of wing design. High-fidelity analysis tool of both aerodynamics and structures were permitted to carry out aeroelastic analysis on those sample design scenarios. Approximation analysis models were constructed using quadratic response surface method, Kriging model or neutral networks. By this way, tightly coupled relationship between aerodynamic and structural discipline was decoupled. A general framework of this MDO （Multidisciplinary Design Optimization） method was carefully designed, and how to improve the accuracy of approximation model by choosing appropriate approximation method was discussed. A numerical example of designing a high aspect - ratio supereritical wing of wing/body configuration was presented, which preliminarily showed that the present method is effective and applicable.