基于Kriging代理模型的飞行器结构刚度气动优化设计

大飞机具有轻质大柔性特点，使得气动/结构耦合作用增强，在设计过程中需要考虑这种耦合效应，直接调用CSD/CFD方法计算周期长，无法满足工程需要.代理模型方法由于能显著提高工程优化设计的效率，已广泛应用于飞行器气动外形优化设计中.采用Kriging方法建立代理模型，通过求解EI函数最大值得到需添加的样本点以更新代理模型，提高代理模型的拟合精度，结合改进的粒子群最优化方法对大飞机的结构刚度进行了优化设计.结果表明，该优化方法能够处理复杂目标的全局优化问题，在保证升力系数及纵向稳定性能不恶化的前提下，降低飞机巡航状态的飞行阻力. 

Aircraft Structure Stiffness and Aerodynamics Optimization Design Based on Kriging Surrogate Model

Light weight and flexibility of the large aircraft make aerodynamic and structural coupling strengthen, as a result, the coupling effect must be considered while designing the aircraft structure. CFD/CSD coupling method cannot meet the requirement of the engineering. The surrogate model method has been used in the aerodynamic shape design for its high efficiency. In the paper, an aerodynamic optimization method based on the Kriging surrogate model was established to optimize the structure stiffness. The method used the maximum expected improvement (EI) function for adding the sample points to improve the accuracy of the surrogate model, and adopted the revised particles swarm optimization algorithm. The results show that the optimization method based on Kriging surrogate model can deal with the complicated problem with global optimization, and the flight drag coefficient is reduced at cruise state while remaining the lift coefficient and longitudinal stability not worsen.