飞翼无人机结构布局分级优化研究

摘要

In view of the structure stiffness and weight problems in traditional structure design,a hierarchical optimization method is proposed to minimize the weight of a flying-wing UAV wing by classification of the design variable.Constrains of structure stiffness,displacement,torque and strength are taken into account.The modified feasible direction method is applied to element size and the Hook-Jeeves method is applied to the location of beams.The whole optimization process is integrated in multidisciplinary optimization framework software.It is proved that it has certain engineering application value in structural optimization of a flying-wing UAV.%针对传统结构设计中依据经验对机翼构件布局设计容易导致结构刚度偏大、重量偏大的问题,采用分离设计变量的方法,分别对机翼构件的尺寸和位置变量,采用改进的可行性方向法和Hook-Jeeves方法进行优化,将尺寸非线性优化嵌入到无约束位置优化中,以结构的刚度、位移、扭转和强度为约束条件,对布局进行调整.采用多学科框架软件对整个优化过程进行集成,将机翼结构重量作为目标函数,分级对位置和尺寸优化,充分考虑耦合位置和尺寸变量间的相互影响关系,循环迭代,直至得到结构重量的最优值.采用方法对某型飞翼无人机的机翼结构进行优化,结果合理,具有一定的工程应用价值.