面向民用飞机排故的增强型符号有向图

ESDG approach for troubleshooting of civil aircraft

针对民用飞机故障的动态特性及维修体制,在符号有向图(SDG)模型中引入动态元素,并融合系统结构模型,提出一种结构和参数能随工况变化而调整的增强型有向图(ESDG)模型。进而提出基于故障依赖矩阵的相容根树搜索算法与分层诊断策略,能解决实际排故中常常因部分状态未测量而造成诊断信息缺失的问题。该方法能满足分级维修中不同诊断精度的要求。多个工况的综合诊断进一步提高了推理分辨率。最后以某民机发动机引气系统为实例说明了该方法的有效性。

Aimed at the dynamic characteristics and maintenance mechanism for the faults of civil aircraft,an enhanced signed directed graph（ESDG）model whose structure and parameters can be adjusted according to the working conditions is proposed by introducing the dynamic elements to the signed directed graph（SDG）model and incorporating the system structure model.Then,compatible rooted tree search algorithm and hierarchical diagnosis strategy based on the fault dependency matrix are proposed,which solves the problem that the diagnosis information is missing since part of the status is not measured in actual troubleshooting.This approach is able to meet the requirements for different diagnosis accuracy in hierarchical maintenance.The comprehensive diagnosis for several working conditions further improves the reasoning resolution.Finally,the validity of this approach is illustrated by taking the example of the engine bleed system of certain civil aircraft.