260 research outputs found
Time-and event-driven communication process for networked control systems: A survey
Copyright © 2014 Lei Zou et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.In recent years, theoretical and practical research topics on networked control systems (NCSs) have gained an increasing interest from many researchers in a variety of disciplines owing to the extensive applications of NCSs in practice. In particular, an urgent need has arisen to understand the effects of communication processes on system performances. Sampling and protocol are two fundamental aspects of a communication process which have attracted a great deal of research attention. Most research focus has been on the analysis and control of dynamical behaviors under certain sampling procedures and communication protocols. In this paper, we aim to survey some recent advances on the analysis and synthesis issues of NCSs with different sampling procedures (time-and event-driven sampling) and protocols (static and dynamic protocols). First, these sampling procedures and protocols are introduced in detail according to their engineering backgrounds as well as dynamic natures. Then, the developments of the stabilization, control, and filtering problems are systematically reviewed and discussed in great detail. Finally, we conclude the paper by outlining future research challenges for analysis and synthesis problems of NCSs with different communication processes.This work was supported in part by the National Natural Science Foundation of China under Grants 61329301, 61374127, and 61374010, the Royal Society of the UK, and the Alexander von Humboldt Foundation of Germany
Excluding Zeno Behaviour in Event-Triggered Time-Delay Systems by Impulsive Controls
In this paper, we study the problem of event-triggered control for
stabilization of general nonlinear time-delay systems. Based on a
Razumikhin-type input-to-state stability result for time-delay systems, we
propose an event-triggered control algorithm to stabilize nonlinear time-delay
systems. In order to exclude the Zeno behaviors, we combine a novel impulsive
control mechanism with the proposed event-triggered strategy; in this sense,
our proposed algorithm is a hybrid impulsive and event-triggered strategy. We
then obtain sufficient conditions for the stabilization of the nonlinear
control systems with time-delay by using the Lyapunov method and Razumikhin
technique. Numerical simulations are provided to show the effectiveness of our
theoretical results
Pull-Based Distributed Event-triggered Consensus for Multi-agent Systems with Directed Topologies
This paper mainly investigates consensus problem with pull-based
event-triggered feedback control. For each agent, the diffusion coupling
feedbacks are based on the states of its in-neighbors at its latest triggering
time and the next triggering time of this agent is determined by its
in-neighbors' information as well. The general directed topologies, including
irreducible and reducible cases, are investigated. The scenario of distributed
continuous monitoring is considered firstly, namely each agent can observe its
in-neighbors' continuous states. It is proved that if the network topology has
a spanning tree, then the event-triggered coupling strategy can realize
consensus for the multi-agent system. Then the results are extended to
discontinuous monitoring, i.e., self-triggered control, where each agent
computes its next triggering time in advance without having to observe the
system's states continuously. The effectiveness of the theoretical results are
illustrated by a numerical example finally.Comment: arXiv admin note: text overlap with arXiv:1407.137
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