中文摘要：

针对分布式综合模块化航空电子（IMA）体系结构,在时间、空间分区以及带宽分区的基础上,提出了网络分区的概念,并建立了相应的网络模型、消息模型、流量模型及调度模型。利用网络演算方法,推导了航空电子混合消息集在网络分区下端到端（ETE）延迟的计算公式;搭建典型网络,通过理论计算对比了网络分区与带宽分区的实时性能。计算结果表明：网络分区下两条硬实时数据流的延迟较带宽分区分别降低了33.5%和74.2%;而弱硬实时与软实时数据流的延迟增加约30%。最后通过OPNET仿真对理论分析所得结果进行了验证,证明网络分区方法符合分布式IMA的分布式架构要求,并满足了系统混合关键性的需求。

英文摘要：

The concept of network partition is proposed for the architecture of distributed integrated modular avionics（IMA） which is based on temporal partition,spatial partition and bandwidth partition.Meanwhile,corresponding models are built including a network model,a message model,a traffic model and a scheduling model.The formulas for end-to-end（ETE） delays of mixed avionic message sets are derived with the help of network calculus theory.A typical network is then built,and theoretical computations are performed in order to compare the real-time performance of network partition with that of bandwidth partition.The computational results show that ETE delays of two hard real-time flows using network partition are reduced by 33.5% and 74.2% respectively as compared with that using bandwidth partition.On the other hand,delays of weakly hard real-time and weak real-time flows increaseby about 30%.Finally,simulation using OPNET is done to verify the computational results.It demonstrates that the network partition method satisfies the requirements of distributed architecture of distributed IMA,and the demands of system mixed-criticality.