基于可达集的故障飞机着陆阶段安全包线研究

Study on the flight safety envelope in the landing phase of the fault aircraft based on reachable set

针对飞机着陆阶段可能出现的发动机失效、舵面卡阻等故障问题,基于可达集理论提出以正向可达集与反向可达集交集作为飞机飞行安全包线,并以此为依据分析故障飞机着陆阶段存在的安全问题。以NASA的项目飞机GTM为研究对象,综合考虑飞机着陆阶段的特点,建立飞机纵向动力学模型,利用可达集分别确定飞机在无故障、单台发动机失效、舵面卡阻情况下着陆阶段的飞行安全包线。仿真结果表明,飞机发生故障时安全包线严重收缩,对飞行着陆阶段的控制造成很大影响,飞机故障时对安全包线产生的影响规律与实际情况相一致。

In order to solve the problems of engine failure and rudder stuck during the landing phase,the intersection of the forward reachable set and backward reachable set was proposed as the flight safety envelope based on reachable set theory,and the safety problems existing in the landing stage of the aircraft were analyzed based on this.This paper took NASA’s GMT as the research object.Considering the characteristics of aircraft landing phase,the longitudinal dynamics model of aircraft was established,and the reachable set was used to determine the flight safety envelope of the aircraft in the landing stage without failure,one engine inoperative and rudder sticking resistance respectively.The simulation results show that the safety envelope shrinks seriously when the aircraft fails,which has a great influence on the control of the flight landing phase,and the law of the influence of the aircraft failure on the safety envelope is consistent with the actual situation.