标题: The time-delay effect of multiple-network systems in NCS
作者: Cheng, Ching-Wen
Lai, Chien-Liang
Wang, Bor-Chyun
Hsu, Pau-Lo
电子工程学系及电子研究所
Department of Electronics Engineering and Institute of Electronics
关键字: time delay;networked control systems (NCS);Smith predictor
公开日期: 2007
摘要: Applications of the network control system (NCS) improve the efficiency, the flexibility, and the reliability of large-scale systems in modem industries. In the same time, applications of NCS for remote control and monitoring reduce the time and cost of installation, reconfiguration, and maintenance. This study integrates the Ethernet, the control area network (CAN) network, and the wireless 802.11b in the present NCS. The TCP/IP and the CAN protocols are adopted as the communication gateway in a remote control system for an AC 400W servo motor. The time delay between the application layer of the client and the application layer of the remote control target has been measured and analyzed in this study. Experimental results indicate that different sampling rates and the environments will greatly affect the delayed time. Also, results indicate that the distance will not affect the delay time in wireless communication. However, as the sampling period reduces, the delay time of the network increases dramatically. In the wireless network, the delay time may change suddenly by the environment interferences. Finally, with a serious time delay, a Smith predictor has been successfully applied to control the servo motor from Kaohsiung which is in 300 kin away to verify the feasibility of the proposed NCS.
URI: http://hdl.handle.net/11536/6434
ISBN: 978-4-907764-28-9
期刊: PROCEEDINGS OF SICE ANNUAL CONFERENCE, VOLS 1-8
起始页: 926
结束页: 931
显示于类别:Conferences Paper