论文部分内容阅读
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.
The large aircraft has the characteristics of light weight and high flexibility, which makes the aerodynamic / structural coupling stronger. This coupling effect needs to be considered in the design process, and the CSD / CFD method is called directly to calculate the cycle length, which can not meet the engineering requirements. The agent model method can significantly improve The efficiency of engineering optimization design has been widely used in the aerodynamic design optimization of aircraft.The Kriging method is used to establish the agent model and the sample points to be added are obtained by solving the maximum of the EI function to update the agent model and improve the fitting accuracy of the agent model. The improved particle swarm optimization method is used to optimize the structural stiffness of the large aircraft.The results show that the optimization method can handle the global optimization of complex targets and reduce the cruising of the aircraft under the premise of not deteriorating the lift coefficient and longitudinal stability State of flight resistance.