Qixin Zhu

Nantong University, Tungchow, Jiangsu Sheng, China

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Publications (6)2.92 Total impact

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    ABSTRACT: Feedback control systems wherein the control loops are closed through a real-time network are called networked control systems. Based on the controlled process that is linear time-invariant system, the network induced delay is viewed as time-varying parameter uncertainties. An existing condition of robust guaranteed cost control law for networked control system is presented by Lyapunov method and robust control theory. The design method of robust guaranteed cost state feedback controller for networked control system is proposed in terms of linear matrix inequalities. Finally the simulation based on the networked control unstable system is studied. The simulation results show the proposed controller is feasible and effective.
    Control and Decision Conference, 2008. CCDC 2008. Chinese; 08/2008
  • Shiming Chen, Qixin Zhu, Huiqin Pei
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    ABSTRACT: In this paper we study the consensus problem of scalable swarm system. We have proposed the two-layer emergent model of scalable swarm system in which the first layer we called individual neighbor layer describes the individual flocking behavior to its local goal position, and the second swarm layer describes the emergent aggregating behavior of swarm system. Here we extend the work to specify the global consensus problem of the swarm model based on Lyapunov stability theory, and study the fault-tolerance ability of the scalable swarming behavior.
    01/2008;
  • Shiming Chen, Huiqin Pei, Qixin Zhu
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    ABSTRACT: Aiming at consensus problem of system comprised of vast intelligent individuals, we study its swarming behavior based on three kinds of initial distribution: 1) initial distribution that all individuals can find each other; 2) initial distribution that an mutual observable chain exists in any two individuals; 3) initial distribution that some individuals can not find each other directly or indirectly, and then an individual motion equation is proposed to improve the consensus of swarming behavior, which is decided by information of some characteristic neighbor individuals and virtual leader individuals specified in advance in the intelligent system. Scalable swarming behavior can be achieved without global information of all individuals based on the individual motion equation.
    01/2008;
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    ABSTRACT: Network-induced delay occurs while exchanging data among devices connected to the shared medium in networked control systems. The realizing methods and conditions of transforming the random time delay to a deterministic time delay are proposed. Basing on the idea of step transforming, the asymptotic stable controller is designed. Basing on the idea of state prediction, the state predicting controller is designed. Simulations are included to demonstrate the theoretical result.
    Control and Automation, 2005. ICCA '05. International Conference on; 07/2005
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    ABSTRACT: The second buffer method is put forward to deal with the wrong order of data packets. The Markov characteristic of delay in networked control systems is analyzed. The evaluation method of element in state transition matrix is given when the wrong order of data packet is considered. Jump linear systems methods arc used to analyze the stability of networked control systems. The sufficient and necessary conditions for stochastic stability of networked control systems are presented.
    Control and Automation, 2005. ICCA '05. International Conference on; 07/2005
  • Shousong Hu, Qixin Zhu
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    ABSTRACT: In this paper, stochastic optimal controllers of networked control systems whose network-induced delay is longer than a sampling period are designed for the two cases of the system with either full state information or partial state information. The controllers are shown to render corresponding networked control systems exponentially mean square stable. The optimal estimator of the system state is presented when the system has partial state information and network-induced delay is longer than a sampling period. The separation theorem is proved to still hold in such networked control systems.
    Automatica 01/2003; 39:1877-1884. · 2.92 Impact Factor

Publication Stats

248 Citations
2.92 Total Impact Points

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Institutions

  • 2005
    • Nantong University
      Tungchow, Jiangsu Sheng, China
  • 2003
    • Nanjing University of Aeronautics & Astronautics
      • College of Automation Engineering
      Nanjing, Jiangsu Sheng, China