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AFDX网络通过对传统的以太网技术进行了改进,凭着其可扩展性,双冗余管理,通信网络延迟的可确定性等优越的网络通信性能,已率先在大中型飞机领域应用,我国的大飞机已确定用AFDX系统。本文以随机Petri网为工具,对AFDX网络进行建模仿真,通过仿真计算出AFDX网络负载和系统的延迟时间两个重要的性能指标,通过对两个指标的性能曲线进行分析,有助于进一步理解航电系统事件消息在AFDX网络中的传输机制,为综合航电系统的设计和完善提供重要的理论依据。
AFDX network through the traditional Ethernet technology has been improved, with its scalability, dual redundant management, communication network delay determinability and other superior network communication performance, has taken the lead in the field of aircraft applications, our country Large aircraft has been identified using the AFDX system. In this paper, we use the stochastic Petri nets as a tool to simulate the AFDX network and calculate two important performance indexes of the AFDX network load and the system delay time by simulation. By analyzing the performance curves of the two indicators, it is helpful to further improve the AFDX network performance. Understanding the transmission mechanism of avionics event messages in AFDX networks provides an important theoretical basis for the design and improvement of avionics systems.