飞翼布局飞机控制/气动/隐身多学科优化设计

Multidisciplinary optimization of control-aerodynamic-stealth for flying wing aircraft design

飞翼布局是先进飞机广泛应用的布局形式.飞翼布局飞机总体设计阶段不仅要考虑其隐身和气动要求,还必须高度重视控制系统的影响.以飞翼布局飞机为对象,研究控制、气动与隐身多学科优化的策略和方法.建立了适合在各学科的子空间进行多目标优化的流程,基于学科分析分配各个子空间的设计变量,并通过变量综合形成系统级的设计变量.在优化过程中,综合采用了改进的遗传算法和近似模型构造方法.针对飞翼布局飞机的特点,采用基于控制分配的控制系统结构,以时域指标作为控制学科的优化目标和约束条件.优化结果验证了所用方法的有效性,为将控制学科纳入飞翼布局飞机多学科优化提供了可行的途径.

Flying wing is a widely applied configuration for advanced military aircraft.Not only should aerodynamic and stealth requirements be taken into account at its conceptual design stage,but also the flight control system should be well designed.A flying wing aircraft was investigated,and the strategy and methods for integrated control-aerodynamic-stealth were studied.A new flow suitable for conducting multi-objective optimization in each discipline＇s subspace was proposed.Design variables in subspace were assigned based on disciplinary analyses,and then system level design variables were formed by variable synthesis.According to the characteristics of flying wing configuration,control allocation based control system architecture was adopted,and time domain indexes were used as objectives and constraints in control discipline.Results of optimization show the effectiveness of new methods,which supply a feasible way for incorporating control discipline into the multidisciplinary design optimization of flying wing configuration aircraft.