基于功能危险分析的涡扇发动机数字控制系统危险识别方法研究

Research on Hazard Identification of Turbo-fan Engine Digital Control Systems Based on Functional Hazard Analysis

将功能危险分析(FHA)方法应用到涡扇发动机全权限数字电子控制(FADEC)系统危险分析,对准确识别系统危险和提高多重失效分析效率的重点问题展开研究。针对由于结构复杂和功能层级较多导致的FADEC失效状态和影响的分析难度问题,提出了FHA功能定义及失效分析层级解决方案;针对多重失效状态数量的组合爆炸问题,提出组合劣化分析方法。在此基础上,针对FADEC发展了一套基于美国自动化工程学会(SAE)ARP-4761可操作的FHA分析方法,并在型号中进行了应用实践。结果表明,本文所提FHA方法能够明确分析出FADEC系统的危险失效状态,并有效减少多重失效分析工作量。

With the functional hazard analysis（FHA） approach applied to hazard identification of turbo-fan engine full authority digital electronic control（FADEC） system,the key problems of the system hazard identification and the multiple failure analysis efficiency are focused in this paper.A system function definition and accordingly a multi-layer failure analysis are proposed to remove the failure condition and effect analysis difficulties in FHA of FADEC system,due to the structural and functional complexity.A worse-combination filtering analysis skill is proposed to handle the quantity explosion problem in the multiple failure condition identification.Based on the basic principles of the Society of Automotive Engineers（SAE） ARP-4761 and all the above skills,a practicable hazard identification procedure is developed for the FHA implementation of FADEC systems and put into use in an industrial case.The results show that the proposed FHA procedure can help clearly identify the hazardous failure conditions of the FADEC system and effectively lower the task load in the multiple failure identification.