摘要
近年来,航空电子全双工交换式以太网(AFDX)作为新一代高实时性、高可靠性总线技术脱颖而出。在此,着重分析了AFDX网络关键技术,按照航电消息的不同种类,对时延要求不同的事件消息赋予不同的优先等级;利用随机Petri网建立了AFDX网络的传输模型来模拟其传输行为;并对其网络负载、消息平均等待时间等重要参数进行了分析。根据AFDX网络的特点,提出消息到达的排队机制,并设计了AFDX交换机的调度算法,以满足更高的可靠性与实时性要求。
Nowadays, full duplex switched Ethernet （AFDX） as a new generation of avionic bus technology with high real-time and high reliability is put forward. The key technologies of AFDX are analyzed. In accordance with the different types of avionic messages, the different priorities are provided for the event messages that has different delay requirements. AFDX network transmission model is established to simulate the message transmis- sion by using stochastic Petri net, and the crucial parameters such as network load and average waiting time are analyzed. According to the specialties of AFDX, the queuing mechanism based on the message arriving is presented, and a new scheduling algorithm is designed to meet a higher demand of reliability and real-time ability.
出处
《测控技术》
CSCD
北大核心
2013年第6期100-103,107,共5页
Measurement & Control Technology
基金
航空科学基金资助项目(2010ZC53036)
