摘要
分布式电推进飞机可通过多推进器间的推力差动来调节飞行姿态,从而为实现动力偏航提供了硬件条件。为此,提出一种基于非线性动态逆的动力偏航控制策略。建立考虑分布式电推进系统推力差动的飞机非线性飞行动力学模型,并基于时标分离原则,将其划分为快状态子系统和慢状态子系统。随后,针对慢状态子系统的非线性特性,设计非线性动态逆控制器实现动力偏航控制,所计算出的滚转、俯仰、偏航速率作为参考指令传递给快状态子系统。快状态子系统控制器同样基于非线性动态逆方法设计,通过调节各分布式推进器间的推力差动,实现对给定滚转、俯仰、偏航速率的跟踪。考虑到分布式电推进系统具有天然的冗余性和容错性,将动力偏航控制策略拓展至了推进器冗余和故障等特殊工况。同时,针对分布式电推进器易受突风、电动机参数变化等扰动影响的问题,设计了基于自抗扰方法的各电推进器本地推力控制器。数值仿真结果表明:该策略可以实现90°动力偏航,并且可以抵抗15 m/s的突风扰动。
Distributed electric propulsion aircraft makes it possible for additional control authority by differential thrust,thus giving rise to the concept of powered yaw control.A powered yaw control scheme based on the nonlinear dynamic inversion was proposed.A nonlinear flight dynamic model was established for the distributed electric propulsion,which explicitly considered the effect of differential thrust.Subsequently,according to the time-scale separation principle,this model was divided into two subsystems for the fast and slow dynamics,respectively.An nonlinear dynamic inversion controller was designed for the slow dynamics for the powered control,while the computed roll,pitch,and yaw rate were sent to the fast dynamic sub-system as reference.The fast dynamics controller was also designed using nonlinear dynamic inversion,which realized the tracking of the desired roll,pitch,and yaw rate by adjusting the thrust of multiple electric propulsors.Considering the redundancy and fault-tolerance of distributed electric propulsion system,the powered yaw control strategy was extended to the redundancy and propulsor failure scenarios.Meanwhile,to overcome the effect of gust encounters and changes in motor parameters,the local thrust controller for each electric propulsor was designed in the framework of active disturbance rejection control.The numerical simulation results show that the strategy can achieve 90°powered yaw and resist gust encounter of 15 m/s.
作者
尤顺
寇鹏
姚轩宇
王京
梁得亮
梁哲
YOU Shun;KOU Peng;YAO Xuanyu;WANG Jing;LIANG Deliang;LIANG Zhe(Shaanxi Key Laboratory of Smart Grid,School of Electrical Engineering,Xi’an Jiaotong University,Xi’an 710049,China;Aero Engine Academy of China,Beijing 101304,China)
出处
《航空动力学报》
EI
CAS
CSCD
北大核心
2024年第2期156-170,共15页
Journal of Aerospace Power
基金
国家自然科学基金重点项目(51737010)。
关键词
全电飞机
分布式电推进
推力差动
飞行控制
非线性动态逆
自抗扰控制
all electric aircraft
distributed electric propulsion
differential thrust
flight control
nonlinear dynamic inversion
active disturbance rejection control
