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施耐德Twido PLC定时器应用原理与编程方法
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作者 李晟 《可编程控制器与工厂自动化(PLC FA)》 2007年第9期56-58,共3页
本文论述了施耐德Twido PLC编程软件TwidoSoft中定时器的工作原理,详细介绍其各自的功能和使用方法。重点分析了单台PLC通过Modbus网络通信控制多台智能设备条件下使用的时间片轮的构造方法,希望为读者选择合适的定时器提供思路。
关键词 定时器 时间片轮
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基于FPGA的多路数据单信道传输方法研究 被引量:1
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作者 刘欢 肖志河 石志强 《计算机测量与控制》 2016年第7期276-279,共4页
为了解决图像数据远距离快速传输的问题,以光纤作为传输媒介,对基于FPGA平台的图像数据传输方法进行了研究;对图像数据的特点及远距离传输面临的问题进行了分析;设计了运行在FPGA上的多路图像数据时分复用系统;从算法设计的角度展开,对... 为了解决图像数据远距离快速传输的问题,以光纤作为传输媒介,对基于FPGA平台的图像数据传输方法进行了研究;对图像数据的特点及远距离传输面临的问题进行了分析;设计了运行在FPGA上的多路图像数据时分复用系统;从算法设计的角度展开,对系统的整个运行框架、时分复用模块工作原理、优缺点进行了分析,提出了一种结合优先级的时间轮片通道复用方式,重点对通道复用模块核心算法进行了介绍,详述了编码单元、发送请求模块的设计方法及特点;最后,在仿真环境下,对整个算法进行了验证,实验仿真分析表明数据得到有效传输,实验结果证明多路数据单信道传输方法有效合理。 展开更多
关键词 高分辨率 图像传输 时分复用 优先级 时间
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Contribution to the Study and Analysis of the Lightning Aggression on the Wind Turbine
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作者 Dib Djalel Mourdjaoui Mourad Abada Zhour 《Journal of Energy and Power Engineering》 2013年第5期891-898,共8页
Generally, lightning damage has mainly been to home appliances and telephones, towers and power transmission and generation equipment mal functions and damage due to strikes on power lines. With the adoption of wind p... Generally, lightning damage has mainly been to home appliances and telephones, towers and power transmission and generation equipment mal functions and damage due to strikes on power lines. With the adoption of wind power generation equipment, however, lightning damage is also increasing in this area. Through his dimensional characteristics, the wind power system is more exposed in the nature compared to all others systems. Lightning damage is the single largest cause of unplanned downtime in wind turbines, and that downtime is responsible for the loss of countless megawatts of power generation. The wind turbines are important structures, since they can easily attract the wrath of storms hits heights close, they can also capture the most distant. The rotation of the blades may also trigger lightning and result in considerable increase in the number of strikes to a wind turbine unit. Since wind turbines are tall structures, the lightning currents that are injected by return strokes into the turbines will be affected by reflections at the top, at the bottom, and at the junction of the blades with the static base of the turbine. We present our contribution in this paper to study lightning strokes and their effects on the wind turbines with the aim to enrich the work and to suggest more effective means of protection against lightning. 展开更多
关键词 Wind turbine LIGHTNING protection BLADE current return stroke carbon reinforced plastics.
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