商用涡扇发动机推力控制故障处置功能解析

针对运输类飞机对动力装置必须确认任何单一失效或故障及可能的失效组合都不会危及飞机安全飞行的适航要求,经工程研究和飞机运营经验证明,原有的通过安全性分析以及申请豁免来表明设计符合性的验证方法存在不足,为了保障飞机飞行的安全性,可增加推力控制故障处置(TCMA)系统。以B787飞机配装的GEnx发动机TCMA系统为研究对象,采用系统工程的方法研究和分析了该系统的安全性需求来源、符合性验证方法及其演进、TCM事件危害、TCMA系统架构和系统功能,其中包括事件侦测、处置逻辑、激活功能监控与内部自检BIT等功能。分析结果表明:TCMA系统是1个集成的智能控制系统,在TCM事件发生后无需飞机机组人员干预,能够自动处置并保障飞机的飞行安全。

Analysis of Commercial Turbofan Engine Thrust Control Malfunction Accommodation

According to the airworthiness requirements of power plant for transport aircraft,the original verification method to show the design compliance through safety analysis and application for exemption had been proved to be insufficient by engineering research and aircraft operation experience.The above airworthiness requirements stipulated that it must be confirmed that any single failure or malfunction or probable combination of failures would not endanger the safe flight of the aircraft.In order to ensure the safety of aircraft flight,the Thrust Control Malfunction Accommodation(TCMA)system could be added.Taking the GEnx engine TCMA system equipped in B787 aircraft as the research object,the system source of safety requirements,compliance verification method and its evolution,TCM events hazard,TCMA system architecture and system functions were studied and analyzed by system engineering method,including event detection,accommodation of logic,activation function monitoring and internal self inspection BIT.The analysis results show that TCMA system is an integrated intelligent control system,which can automatically handle and ensure the flight safety of aircraft without the intervention of aircraft crew after TCM events.