基于有向图的飞机增压系统功能建模故障诊断研究

摘要

According to the complexity of civil airplane system and the characteristic of fault diagnosis,this paper establishes function model of aircraft pressurization system,and then designs a fault diagnosis algorithm to realize fault location precision based on directed graph.First of all,the function relationship between the components is determines by analysis of the composition of turbocharging system;secondly,according to the func-tional modeling approach,combining the knowledge of graph theory with the system component functions given nodes in a directed graph,the function model of the system is established;finally,the test component as the key node will be defined priority value to reduce the fault point set,and it de-signs the fault diagnosis flow chart to complete the fault location of system.From the result of instance analysis,fault diagnosis method accurates fault location of digital pressure controller the component level,and improves the efficiency of fault diagnosis.%针对民用飞机系统的复杂性和故障诊断的特点，基于有向图理论建立了飞机增压系统的功能模型，进而设计了故障诊断算法以实现精确的故障定位；首先，通过分析增压系统的组成得出各组件之间的功能关系；然后根据功能建模方法，结合图论知识将系统个组件功能赋予有向图中的节点，建立系统的功能模型；最后将可测试组件作为关键节点，定义优先权值以缩小故障点集，设计故障诊断流程图完成了系统的故障定位；从实例分析结果来看，所研究的故障诊断方法能准确定位数字式增压控制器这一元器件级别的故障，提高了排故精度和效率。