航空发动机滑油系统LRU级故障树建模与分析  

LRU Class Fault Tree Modeling and Analysis of Aeroengine Lubricating System

作　　者：李哲[1] 豆鹏飞 刘津宏 王卓健[1] LI Zhe;DOU Peng-fei;LIU Jin-hong;WANG Zhuo-jian(Aviation Engineering School,Air Force Engineering University,Xi'an,Shaanxi 710038;Unit 95092 of the PLA,Kaifeng,Henan 475003;Unit 95478 of the PLA,Chongqing 401329)

机构地区：[1]空军工程大学航空工程学院,陕西西安710038 [2]中国人民解放军95092部队,河南开封475003 [3]中国人民解放军95478部队,重庆401329

出　　处：《液压与气动》2024年第1期172-180,共9页Chinese Hydraulics & Pneumatics

摘　　要：滑油系统是航空发动机的关键系统之一,一旦发生故障,严重影响飞行安全。滑油系统结构复杂,排故难度较大。对滑油系统进行LRU级故障树建模和分析,能够为快速定位LRU级故障源提供指导性建议。根据滑油系统工作原理、组成与运行特点,构建了以LRU级故障为底事件故障树模型,运用下行法求解故障树最小割集,采用不交化的最小割集表达式,计算滑油系统顶事件故障发生概率,以及滑油压力异常、油液污染、滑油消耗量大、滑油系统部件损坏等典型故障发生概率;在不交化最小割集矩阵中,与求顶事件概率相对应,分析LRU级故障树底事件概率重要度和相对概率重要度;通过概率重要度分析明确航空发动机滑油系统的易损部件,为日常维护与管理提供参考。Lubricating oil system is one of the key systems of aero engine.Once faults occur,it seriously affects flight safety.Structure of lubricating system is complex.Troubleshooting is difficult and fault obviation is more difficult.Modeling and analysis of LRU level fault tree for lubricating system can provide guidance for quickly locating LRU level fault source.According to the working principle,composition and operation characteristics of the lubricating system,a fault tree model based on LRU level fault is constructed.The minimum cut set of fault tree is solved by the downward method.The occurrence probability of top event fault of lubricating system and the occurrence probability of typical faults such as abnormal oil pressure,oil pollution,large oil consumption and damage of components are calculated based on the expression of disjoint minimum cut set.In the disjoint minimum cut set matrix,it is corresponding to the top event probability.Probability importance and relative probability importance of LRU level fault tree bottom events are analyzed.Through probability importance analysis,the vulnerable parts of aero-engine lubricating oil system are defined,which provides reference for daily maintenance and management.

关 键 词：滑油系统 LRU级故障树 概率重要度 相对概率重要度 航空发动机 

分 类 号：TH137[机械工程—机械制造及自动化] V263[航空宇航科学与技术—航空宇航制造工程]