网络控制系统消息时延的仿真研究  

Simulation Research on Message Time Delay of Networked Control Systems

作　　者：李雯[1] 戴金海[1] 

机构地区：[1]国防科技大学航天与材料工程学院,湖南长沙410073

出　　处：《计算机仿真》2008年第3期156-158,178,共4页Computer Simulation

摘　　要：网络时延是网络控制系统(NCS)面临的首要问题,由于受MAC机制、网络负载、网络调度等因素影响,该时延一般是时变和不确定的。传统控制系统仿真软件难以客观反映网络时延的变化,无法用于NCS时延的仿真分析。应用TrueTime仿真工具,对NCS网络时延的主体-消息时延进行仿真研究。首先,给出了利用TrueTime进行NCS仿真的结构框图,分析了TrueTime内核模块和网络模块的功能特点;其次,针对一个具体的NCS,建立了TrueTime仿真模型;最后,通过仿真试验,研究了NCS消息时延的变化特性,所得结论可以指导NCS的分析与设计。Network time delay is the key problem of Networked Control Systems （ NCS）, the delay is uncertain and changed by MAC mechanism, network traffic, network scheduling etc. Traditional control system simulation software can not be used to analyze the delay of NCS, because they can not reflect such change of the delay. In this thesis,the main part of network time delay of NCS -message time delay is researched by TrueTime. Firstly, the block diagram of NCS simulation based on TrueTime is given, and the functions of kernel module and network module of TrueTime are analyzed. Secondly, a TrueTime simulation model of a special NCS is built. Finally, characteristics of the changing of message time delay are studied by simulation test, some conclusions are gained which can instruct the analysis and design of NCS.

关 键 词：网络控制系统 消息时延 数值仿真 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]