Reliability evaluation of avionics system with imperfect fault coverage and propagated failure mechanisms  

作　　者：Ying CHEN Song YANG Rui KANG 

机构地区：[1]Science and Technology on Reliability and Environmental Engineering Laboratory,Beihang University,Beijing 100083,China

出　　处：《Chinese Journal of Aeronautics》2020年第12期3437-3446,共10页中国航空学报（英文版）

基　　金：funded by the National Natural Science Foundation of China(Nos.61503014 and 61573043)。

摘　　要：Fault tolerance designs are essential techniques for systems that require high levels of reliability,such as aircraft or spacecraft control system.Imperfect Fault Coverage(IFC)may lead to the failure of a system or subsystem even with adequate redundancy.Previous studies of IFC mostly concentrated on evaluating Coverage Factor(CF),whereas the system failure behaviors with IFC have rarely been involved.Failures that occur in low-layer may be covered by highlayer.However,if the coverage is imperfect,uncovered failure will have functional and physical impact on the system behavior.In this thesis,the failure behavior and reliability of IFC of multi-layer systems are studied and a Binary Decision Diagram(BDD)-based modeling and simulation method are proposed to evaluate system reliability.As a case,the failure behavior of an aero engine electronic controller with IFC is studied.The results show that the IFC may impact system behavior without taking the IFC into account,the system maintenance intervals may reduce,and thus the maintenance costs will increase.

关 键 词：ACCELERATION Binary Decision Diagram(BDD) Failure mechanism Imperfect Fault Coverage Multi-layer system Reliability evaluation 

分 类 号：V243[航空宇航科学与技术—飞行器设计]