摘要
为了实时有效地评估现实网络的可靠性,针对目前可靠性分析方法大多基于静态模型的问题,提出了一种基于效能的网络可靠性评估模型.在使用Weibull函数表示故障率模型的基础上建立了链路和节点效能的时变模型,并根据求解全网可靠性的一般方法得到整个网络的时间效能模型,通过网络效能的变化动态评价网络的可靠性.实验仿真结果表明,该网络效能模型在可修复系统与不可修复系统中能够客观描述网络效能随时间的变化.随着时间的增长,对于故障率时不变系统,网络效能将趋于稳定值;而对于故障率时变系统,网络效能将趋于0.时变故障系统模型更加适合于实时的网络效能分析,为网络可靠性的分析提供了更加有效的方法.
For the real-time and efficient estimation of the real network reliability,an evaluation model for the network reliability based on the efficiency analysis is presented focusing on the problems that current reliability analysis methods mostly are based on the static model.The time-dependent model of the node and link efficiency is established based on the failure rate model with the usage of Weibull function.The time-dependent network efficiency model is derived from the all-terminal reliability method and the network reliability is evaluated through the variety of the network efficiency.The simulation results show that the proposed model can objectively describe the time-dependent variety of the network efficiency in repairable and non-repairable systems.As time grows,the network efficiency tends to be steady in the time-invariant fault system and to be zero in the time-varying fault system.The time-varying fault system is more suitable for real-time network efficiency analysis,which provides a more efficient evaluation method for network reliability.
出处
《东南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2012年第4期599-603,共5页
Journal of Southeast University：Natural Science Edition
基金
国家高技术研究发展计划(863计划)资助项目(2009AA01Z427)
"十一五"国家科技支撑计划资助项目(2008BAH33B03)
关键词
网络可靠性
效能
故障率
平均无故障时间
平均修复时间
network reliability
efficiency
failure rate
mean time between failure
mean time to restoration
