Based On The Wireless Network Scheduling Of Networked Control System

Wireless technology which was been introduced into networked control systems research was both a kind of breakthrough also brought many challenges. Many previous analysis and research methods based on wired networked control systems were no longer suitable under the wireless environment, need to redesign and research. Wireless networked control systems (WiNCSs) research involves network communication technology and control science two domains. To improve system performance not only depends on the design of control algorithms, but also has close relation with scheduling algorithms. This thesis is focus on the scheduling problem of WiNCSs. The primary content is as follows.1) Researched on the logical relation between each wireless node in WiNCSs. And divided into concentration type and distribute type two kinds of structure types. Introduced the technical characteristics and the methods of using TrueTime toolbox, which is the foundation of the WiNCSs simulation.2) For a concentration type WiNCSs, firstly, designed based on AP event-driven, based on AP modified time-driven and network idle scheduling algorithm. Comparative studied the control effect of TCP and UDP protocol in WiNCSs. Researched the difference of deadband was been installed in sensors and controllers. Designed a variable sampling period scheduling algorithm and a mixed scheduling algorithm based on feedback thought, which is make ensure the control performance as the primary objective. Studied scheduling problem of hybrid networked control systems.3) For a distribute type WiNCSs, first of all through simulation experiments pointed out the relationship between hop count and control system performance, pointed out the necessity to add a routing protocol. Analyzed the routing protocol type, and through writing programs, added AODV algorithm to experiment environment. Experimental results showed that the routing algorithm which has been added to the system can automatically search for a small delay routing. Even when transmission link broken, system could find new routing.