基于功能危险分析的涡轴发动机适航安全性评估

Safety Assessment of Turboshaft Engine Airworthiness Based on Functional Hazard Analysis

针对涡轴发动机安全性需求,确定了其适航安全性分析的方法及程序。运用整机级功能危险分析法(FHA)对涡轴发动机进行安全性分析,并针对其系统结构的复杂性等问题,提出了整机级FHA功能定义的层级解决方案;利用可靠性模型识别多重失效组合问题;针对功能失效状态影响分析主观性强、难于确定的特点,提出了Delphi法进行专家评估。结果表明:安全性验证程序能够为涡轴发动机安全性验证提供支持,FHA可以较快速识别涡轴发动机整机级危险失效状态,较为客观地确定功能危险影响等级,并有效减少工作量。

Aiming at the turboshaft engine safety, its analysis method and program were defined. The safety analysis of turboshaft engine was conducted by Funetional Hazard Analysis （FHA）. The layer solutions of FHA were proposed based on complicated system structure, and multiple failure combinations were identified by reliability models. Due to strong subjective and difficult identification of FHA, Delphi method was proposed to take expert＇s assessment. The results show that the turboshaft engine safety is validated by its programs. The hazard failure of the whole turboshaft engine is quickly identified by FHA, which can objectively define the functional hazard influence degree and effectively reduce workloads.