模糊故障树分析法在航空发动机滑油渗漏分析中的应用

Aviation Engine Oil Leakage Fault Analysis Based on Fuzzy Fault Tree Theory

为准确查找航空发动机滑油渗漏原因,研究模糊故障树理论在飞机故障诊断方面的应用;以CFM56-7B发动机滑油系统为研究对象,将故障树理论应用于滑油系统渗漏故障诊断中,采用下行法求解最小割集得到故障诱因最小事件;根据滑油故障发生概率具有模糊和不确定性特点,结合Delphi专家调查采用模糊数学理论进行定量分析,确定故障诱因事件风险重要度排序;从CFM56-7B滑油渗漏故障原因重要度排序可知,故障诱因依次为后收油池供油口盖封严损坏(x1)、后收油池滑油回油管接头处裂纹(x2)、发动机使用MJO291滑油后导致密封材料损坏(x8)等,维修时应注意;维修单位故障记录验证了方法的有效性,可为准确和快速诊断和排除滑油渗漏故障提供参考。

In order to find out the aviation engine oil leakage reasons,research the fuzzy Fault Tree Analysis （FTA）theory application in fault diagnosis.CFM56-7B engine oil system is taken as the research object,the fault tree analysis theory is adopted to oil leakage fault di-agnosis,downlink method is put forward to solve the minimal cut sets and obtained fault incentives minimum event.Considering the fuzzy and uncertain characteristics of oil failure,fuzzy mathematical theory combined with Delphi expert survey is used for quantitative analysis to determine the fault cause event risk degree.From the CFM56-7B oil leaking causes sort importance,the close sump oil filler cap damage （x1 ）,the close sump oil return pipe joints crack （x2 ）,seal material damage after use MJO291 oil （x8 ）,etc lead to engine oil leakage,which should pay more attention.The maintenance unit fault records verify the validity of the methods,which provide a reference for accurate and rapid diagnosis and exclude oil leakage fault.