通过研究功能故障有向图分析(FF-SDG)方法及建模步骤,深入剖析基于FF-SDG模型的系统故障诊断方法,通过分析飞机系统组成部分的失效模式、机理影响分析、工作原理等,使用建模工具创建诊断模型,利用推理诊断程序来实现故障诊断推理,并以飞机发动机引气系统为例验证该方法的可行性。 Through the research of FF-SDG method and modeling step, the method of system fault diagnosis based on FF-SDG model is deeply analyzed. By analyzing the failure modes, mechanism impact analysis and working principle of aircraft system components, The use of modeling tools to create a diagnostic model, the use of reasoning diagnostic procedures to achieve fault diagnosis reasoning, and the aircraft engine bleed air system as an example to verify the feasibility of the method.