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Stability Analysis Of Event-triggered Networked Control Systems

Posted on:2017-03-10Degree:MasterType:Thesis
Country:ChinaCandidate:Y Y LiFull Text:PDF
GTID:2308330485964278Subject:Control Engineering
Abstract/Summary:PDF Full Text Request
Networked control systems is a space distributed systems. Sensors, controllers and actuators connected by a limited bandwidth communication network. Because of network introduced to network control systems, the most prominent problem of network time delay and bandwidth limited produced. Although the traditional method of sampling is easy to realize, this approach is not appropriate in the view of resource utilization, because of system is running under ideal conditions, and periodically perform task will cause the waste of resources and bandwidth. In recent years, more and more big data transferred by network with the increase of system scale, so the problem of network bandwidth resources is prominent. Considering improve the utilization rata of resources and reduce the waste of limited network bandwidth resources, networked control systems research of event-triggered get more attention and research results has obtained. Therefore, design and research the networked control system of event-triggered is necessary. Under the event-triggered mechanism, mainly analysis the condition of the stability of networked control systems.The main content of this paper includes the following several aspects:First of all, for networked control systems with time-varying delay, an output dependent event-triggered condition was designed, and closed loop system model was established which contain the network time delay and event-triggered scheme. Then system stability was analyzed by Lyapunov function and Linear Matrix Inequality (LMI), and a numerical example was given to demonstrate the effectiveness by Matlab simulation.The second, for networked control systems with time-varying delay, an output dependent event-triggered condition was designed. Based on this, the logarithmic quantizer was put forward, and transfers the effect of data quantization into uncertain sector bounded. Considering the network time delay, event-triggered scheme and data quantization, an equivalent model was established. Then system stability was analyzed by Lyapunov function and LMI.The last, for networked control systems with time-varying delay, an output dependent adaptive event-triggered condition was designed. Based on this, the problem of guaranteed cost was researched. On the premise of guarantee the stability of system, the proposed adaptive event-triggered scheme can effective reduce the amount of data transmission in the network. Considering the network time delay and adaptive event-triggered scheme, an equivalent model was established. Then system stability was analyzed by Lyapunov function and LMI.
Keywords/Search Tags:networked control systems, event-triggered scheme, time-varying delay, lyapunov function, linear matrix inequality
PDF Full Text Request
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