翼身融合飞机横航向操稳特性适航评估

Airworthiness assessment of lateral-directional stability characteristics for blended wing body aircraft

翼身融合(blended wing body,简称BWB)飞机是未来民机的重要发展方向之一。分析了BWB飞机飞行特性并根据相关规章提出适航操稳特性要求,针对典型背撑式双发BWB布局飞机建立了六自由度飞行动力学模型,设计了反馈增稳控制律以满足飞行品质要求;并采用伪逆法设计了控制分配以完成多操纵面偏转的指令,基于系统仿真的方法对临界发动机失效情况下横航向操纵性和机动性开展了适航评估。仿真结果表明,该布局飞机在临界发动机失效情况下仍具有足够的剩余操纵性和机动性。

Blended wing body(BWB)aircraft is one of the important development directions for future civil“green aviation”goal.In this paper,the open-loop flight characteristics of BWB aircraft are analyzed,and the requirements for airworthiness stability characteristics are proposed according to relevant regulations.A six-degree-of-freedom flight model for a typical BWB aircraft with back-supported engines was established.Feedback stabilization control laws were designed to meet the flight quality requirements,and control allocation was designed using the pseudo-inverse method to achieve commands of multiple control surfaces.Based on system simulation,an airworthiness evaluation was conducted for lateral-directional controllability and maneuverability under critical engine inoperative conditions.The simulation results demonstrate that the BWB aircraft still maintains sufficient residual controllability and maneuverability in the event of critical engine inoperative.