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【可调延时网络】基于FPGA的可调延时网络系统verilog开发
2022-07-06 03:45:00 【fpga和matlab】
1.软件版本
ISE14.7
2.系统原理
“网络控制系统”一般有两种理解,一种是对网络的控制(Control of Network);另一种是通过网络传输信息的控制系统(Control through Network)。这两种系统都离不开控制和网络,但侧重点不同。前者是指对网络路由、网络数据流量等的调度与控制,是对网络自身的控制,可以利用运筹学和控制理论的方法来实现;后者是指控制系统的各节点(传感器、控制器、执行器等)之间的数据不是传统的点对点式的,而是通过网络来传输的,是一种分布式控制系统,可通过建立其数学模型用控制理论的方法进行研究。图1给出了网络控制系统的结构。本文主要研究的内容正是后者,即:网络控制系统。
图1 网络控制器结构图
在网络控制系统中,通常采用分布式控制方式。分布式控制的结构形式很多,其中一种典型结构形式为基于现场总线的网络控制系统。在这种结构形式中,整个系统通过网络总线形成闭合回路,因此在环路中就存在着由通信延迟带来的时延。当时延远小于采样周期时,其影响可忽略不计;当时间延迟相对采样周期不能忽略时,系统的分析和设计就必须考虑时延的影响。在传感器、执行器和控制器通过网络交换数据时,就产生
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