CFD/CSD耦合飞行器多学科优化设计新方法

文章以飞行器巡航外形为设计对象, 构建了一种新的飞行器的气动和结构特性评估方法, 即结构模型反迭代方法.该方法较传统的松耦合静气动弹性方法效率提高了4倍以上.以此为基础建立了一种新的飞行器气动/结构耦合多学科优化设计框架, 将优化效率提高4倍以上.采用数值求解N-S方程和结构有限元方程方法作为气动和结构学科的分析工具, 保证了设计结果的可信性.算例表明以巡航外形作为设计对象能够获得与传统方法一致的飞行器气动与结构特性, 以此为基础开展的无人机气动外形优化设计也获得了良好的设计结果. 

A Novel Multidisciplinary Design Optimization of Aircraft Based on CFD/CSD Coupling

A novel aero-structural performance validation methodology was proposed, namely, reverse iteration of structural model. This methodology aims to improve the aero-structural performance of cruise shape, and its efficiency can be improved by 4 times compared with conventional loosely-coupled aeroelastic analysis. A multidisciplinary design optimization methodology was proposed based on the above methodology, which aims to optimize the cruise shape directly. The optimization efficiency can be improved by 4 times with the proposed framework. The aerodynamic performance was predicted by N-S solver in this paper. Structural analysis was carried out by finite element analysis. All these analysis methods assured the design to be reliable. Test shows that the proposed aero-structural performance prediction methodology has the same fidelity with that of the conventional methodology. Aero-structural optimization design of an UAV based on the proposed framework validated the proposed methodology further.