Research on Network Delays of Networked Control Systems |
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Authors: | MA Xiang-hua XIE Jian-ying WEI Zhen |
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Institution: | 1. Inst.of Automation,Shanghai Jiaotong Univ.,Shanghai 200030,China 2. Rockwell Automation Shanghai Research Center,Shanghai 200233 |
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Abstract: | In networked control systems (NCS), the main problem is time delays induced by communication network, which can deteriorate the performance of the systems, even cause the systems instability. If we know the exact network delays, we can compensate for their effect by modifying the parameters of the controller. Hence how to get the knowledge of these delays in the network is critical. This paper analyzed the different characteristics of network delays from sensor to controller and from controller to actuator and presented the methods of online evaluation of these delays. The experiment shows these methods are valid. |
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Keywords: | networked control systems (NCS) network delays online delay evaluation average delays window closest matching method |
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