基于试验气动力的飞机副翼效率优化

针对弹性后掠翼飞机在使用试验气动力分析时所出现的副翼反效问题,利用遗传算法对机翼结构进行优化.弹性飞机副翼效率计算采用试验气动力.重点针对一个发生副翼反效的严重飞行状态点进行了机翼结构优化,对比分析了优化前后副翼效率、相同副翼偏度下所产生的滚转率随飞行动压的变化及颤振特性的变化.并比较了基于试验气动力的情况下只针对单一飞行攻角的优化结果和同时考虑多个飞行攻角的优化结果,分析了飞行攻角对优化结果的影响.结果证明:利用结构优化方法可有效在详细设计阶段解决弹性飞机严重飞行状态点副翼反效问题,并且优化结果对飞机颤振特性基本无影响.

Structural optimization of flexible aircraft considering aileron efficiency based on experimental aerodynamic forces

Wing-s structural optimization of a flexible aircraft was conducted to solve aileron reversal problem utilizing a genetic algorithm. The aileron efficiencies and rates of roll of the aircraft were calculated using nonlinear experimental aerodynamic forces. The emphasis research was wing-s structural optimization to a serious flight state which contained the aileron reversal problem. The variations of aileron efficiency and angular velocity of rolling with dynamic pressures were investigated separately based on the aircraft structure before and after the optimization. The flutter characteristics of the aircraft before and after the structural optimization were contrasted. The optimizations to different flight states and a synthesized optimization considering constraints of three different flight states were developed. The affection of angle of attack to the optimization was analyzed. The results show the aileron reversal can be solved using structural optimization in the detailed design phase of the aircraft, and the optimization has no negative effect on the flutter characteristics of the aircraft.