基于D-S证据理论的航空发动机故障诊断

Aeroengine Fault Diagnosis Based on D-S Evidential Theory

航空发动机滑油中含有摩擦副产生的磨损微粒。通过滑油介质中所含磨损微粒中元素的分析,运用Dempster-Shafer证据融合诊断方法,对航空发动机的磨损状态等进行有效的诊断,确定发动机的磨损程度,以及发动机的磨损部位,从而可对发动机的故障排除作参考。在融合过程中提出了先对每个元素的磨损量和磨损率进行融合,再总体融合的方法。针对Dempster-Shafer证据融合的局限,应用了两种改进的融合方法,并进行比较。实例表明,Dempster-Shafer证据融合是一种有效的航空发动机滑油磨损的故障诊断方法。

Aeroengine oil contains wear debris generated by friction. Appling the Dempster-Shafer evidence combination diagnosis method,aeroengine wear conditions can be effectively diagnosed, as references for troubleshooting which can determine engine＇s wear levels and wear parts, throngh analysising the elements of wear debris in lubricating meduim. In the process of integration, an idea was proposed that,firstly ,the elements of wear and wear rate were fused,then overall integration. For Oempster-Shafer has its own limitations, two methods impoved were used to and compared. It is shown that Dempster-Shafer evidence combination is an effective fault diagnosis method for aeroengine oil wear.