由于电机运行条件的变化,使得其对应的信号也会出现波动,要实现准确监测,需要可靠的采集手段和传输方式,为此提出基于ARM嵌入式系统的电机多路信号监测及数据采集。利用高精度电压传感器和电流传感器实现对电机信号的采集,ARM处理器构...由于电机运行条件的变化,使得其对应的信号也会出现波动,要实现准确监测,需要可靠的采集手段和传输方式,为此提出基于ARM嵌入式系统的电机多路信号监测及数据采集。利用高精度电压传感器和电流传感器实现对电机信号的采集,ARM处理器构建了无线网络连接机制,在传输控制协议/网际协议(Transmission Control Protocol/Internet Protocol,TCP/IP)的支撑下确保数据实现实时传输,以时间为基础建立电流和电压数据之间的匹配关系,实现对其异常的分析判断。测试结果表明,设计方法可以实现对电机数据的准确采集和有效监测。展开更多
Transmission Control Protocol （TCP） in infrastructure based vehicular net- works is dedicated to support reliable Intemet services for mobile users. However, an end-to- end TCP flow not only experiences some com- mo...Transmission Control Protocol （TCP） in infrastructure based vehicular net- works is dedicated to support reliable Intemet services for mobile users. However, an end-to- end TCP flow not only experiences some com- mon challenges in wireless mobile networks, such as high packet loss rate, medium access competition, unstable wireless bandwidth, and dynamic topology, etc., but also suffers from performance degradation due to traffic congestion at the Road-Side Units （RSUs） that connect the wireline and wireless networks. In order to address the challenging issues related to reliable TCP transmissions in infrastruc- ture based vehicular networks, we propose an RSU based TCP （R-TCP） scheme. For wireline source nodes, R-TCP adopts a novel flow control mechanism to adjust transmission rates according to the status of bottleneck link. Specifically, during the short wireless connec- tion time in Infrastructure based vehicular net- works, R-TCP quickly chooses an ideal trans- mission rate for data transmissions instead of activating the slow start algorithm after the connection is established, and successfully avoids the oscillation of the transmission rate. Simulation results show that R-TCP achieves great advantages than some relate proposals in terms of throughput, end-to-end delay, and packet loss rate.展开更多
文摘由于电机运行条件的变化,使得其对应的信号也会出现波动,要实现准确监测,需要可靠的采集手段和传输方式,为此提出基于ARM嵌入式系统的电机多路信号监测及数据采集。利用高精度电压传感器和电流传感器实现对电机信号的采集,ARM处理器构建了无线网络连接机制,在传输控制协议/网际协议(Transmission Control Protocol/Internet Protocol,TCP/IP)的支撑下确保数据实现实时传输,以时间为基础建立电流和电压数据之间的匹配关系,实现对其异常的分析判断。测试结果表明,设计方法可以实现对电机数据的准确采集和有效监测。
基金supported in part by Fundamental Research Funds for the Central Universities of China under Grant(N140405004) partly by National Natural Science Foundation of China(61373159)+1 种基金partly by Educational Committee of Liaoning Province science and technology research projects under Grant (L2013096)partly by Key Laboratory Project Funds of Shenyang Ligong University (4771004kfs03)
文摘Transmission Control Protocol （TCP） in infrastructure based vehicular net- works is dedicated to support reliable Intemet services for mobile users. However, an end-to- end TCP flow not only experiences some com- mon challenges in wireless mobile networks, such as high packet loss rate, medium access competition, unstable wireless bandwidth, and dynamic topology, etc., but also suffers from performance degradation due to traffic congestion at the Road-Side Units （RSUs） that connect the wireline and wireless networks. In order to address the challenging issues related to reliable TCP transmissions in infrastruc- ture based vehicular networks, we propose an RSU based TCP （R-TCP） scheme. For wireline source nodes, R-TCP adopts a novel flow control mechanism to adjust transmission rates according to the status of bottleneck link. Specifically, during the short wireless connec- tion time in Infrastructure based vehicular net- works, R-TCP quickly chooses an ideal trans- mission rate for data transmissions instead of activating the slow start algorithm after the connection is established, and successfully avoids the oscillation of the transmission rate. Simulation results show that R-TCP achieves great advantages than some relate proposals in terms of throughput, end-to-end delay, and packet loss rate.
