共查询到19条相似文献,搜索用时 234 毫秒
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网络控制系统的稳定性分析 总被引:1,自引:1,他引:0
在网络控制系统中,由于网络的通讯带宽的限制、信息(包括传感器信号,控制器信号,等等)的碰撞等诸多原因,不可避免地会使信息在传输过程中存在时延,称之为网络诱导时延.网络诱导时延是导致控制系统的性能降低,甚至使得系统不稳定的主要因素.为了克服网络诱导时延对控制系统造成的影响,建立了具有参数不确定性的线性网络控制系统模型,利用Razumikhin和Laypunov定理来估计传输时延的最大界,给出了网络控制系统渐进稳定的充分条件.并且由LMI方程给出了稳定的控制器增益K.仿真实例证明了结论的有效性. 相似文献
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网络控制系统的H∞状态反馈控制器设计 总被引:3,自引:1,他引:2
研究了对网络控制系统如何设计H∞状态反馈控制器.这些网络控制系统中存在不确定的网络时延和数据包丢失.当网络时延和连续丢包有界时,可以将系统建模为具有时变输入时滞的系统,利用Lyapunov-Krasovskii泛函,推导出网络控制系统渐近稳定的充分条件.将这些充分条件转化为带等式约束的LMIs,并对他们进行迭代求解,就可以构造H∞控制器.与现有结果相比,在推导稳定性条件时本文对交叉项采取了更紧的界定,并且在设计控制器时无需知道调节参数.因此,本文提出的方法具有更低的保守性.仿真结果说明了本方法的正确性和有效性. 相似文献
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The whole performance of the networked control system (NCSs) depends on two interaction factors, namely the quality of control performance (QoP) and quality of network service (QoS). So, to optimize the whole perfor-mance of NCSs, the problem of guaranteeing QoP and QoS plays an important role in the design of NCSs. However, up to now, little work has been done in this field. In this paper, a synthesizing control model of NCSs to guarantee QoP and QoS is proposed, and a feasible condition of optimizing whole performance of NCSs is also suggested. Finally, the simulation results show that the proposed model is effective. 相似文献
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将覆盖网络引入到基于Internet的网络控制系统(NCS)中,讨论了一种适合于Internet网络控制系统的相近最小代价调度(MLCS)策略,并对其进行了优化。通过仿真系统表明,该基于覆盖网络的调度及其优化策略能有效地保证网络服务质量QoS,从而提高NCS的性能。 相似文献
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网络化控制系统综合控制方法研究 总被引:2,自引:0,他引:2
在阐明网络化控制系统采用兼顾控制系统性能质量(QoP)和网络服务质量(QoS)的控制方法的必要性和可行性的基础上,提出了一种能够兼顾控制系统QoP和网络QoS的网络化控制系统综合控制方法,并对其工作机理进行分析.在对目前相关的研究工作进行分析总结的基础上,提出了一种基于网络化控制系统综合控制方法的控制模型,最后通过一个数字仿真实例说明了该模型的有效性. 相似文献
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The overall quality of network connections has a significant impact on the performance of networked applications. As a result, Quality-of-Service (QoS) management for networked multimedia applications over IP is a significant and immediate challenge. While differentiated services (DiffServ) provide a sense of resource allocation and QoS, they do not guarantee QoS. This paper presents the design, implementation and evaluation of a content-aware bandwidth broker (CABB) that manages QoS for multimedia applications in a DiffServ environment. CABB allocates network resources to multimedia flows based on client requirements, the adaptability of the application, and its tolerance to network level parameters such as bandwidth, delay, and latency. It has been implemented and evaluated using the NS-2 simulator toolkit. Evaluations show that CABB improves network resource allocations and increases overall throughput. Furthermore multimedia application flows are better managed and controlled, improving perceived QoS and avoiding possible congestion at core routers. 相似文献
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具有通信约束的网络化控制系统容错控制研究 总被引:3,自引:0,他引:3
Implementing a control system over a communication network induces inevitable time delays that may degrade performance and even cause instability. One of the most effective ways to reduce the negative effect of delays on the performance of networked control system (NCS) is to reduce network traffic. In this paper, adjustable deadbands are explored as a solution to reduce network traffic in NCS. A method of fault-tolerant control of networked control system is presented, which takes into account system response as well as network traffic. The integrity design for a kind of NCS with sensor failures and actuator failures is analyzed based on robust fault-tolerant control theory and information scheduling. After detailed theoretical analysis, the paper also provides the simulation results, which further validate the proposed scheme. 相似文献
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具有短时延的网络控制系统的一种鲁棒控制方法 总被引:3,自引:0,他引:3
针对具有短时延的网络控制系统, 本文提出了一种基于鲁棒控制的方法来解决该类系统的稳定化控制问题. 考虑状态反馈控制律, 将闭环网络控制系统描述为一个离散时间线性不确定系统模型, 其中的不确定部分反映了时延的时变特性对系统动态的影响. 得到了该闭环网络控制系统的渐近稳定性条件, 且该条件建立了闭环网络控制系统稳定性与两个时延参数, 即允许时延上界和允许时延变换范围, 之间的定量关系. 进一步的, 还给出了稳定化反馈控制器的设计步骤. 最后通过一个示例验证了本文所提出方法的有效性. 相似文献
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The networked control system (NCS) is currently receiving increasing attention from researchers. Researches on this subject, however, have not considered the co‐design of network quality of service (QoS) and control quality of performance (QoP). This paper proposes a novel NCS design framework based on scheduling and control co‐design to compensate for random network‐induced delays. In the framework, a scheduling algorithm used to find the optimal sampling regions of control loops performs rough adjustment and guarantees the network QoS, while a novel adaptive fuzzy PID controller is designed to perform accurate adjustment to guarantee the control QoP. Practical application results obtained with a multi‐loop NCS show that the framework can ensure satisfactory performance due to its robustness against network uncertainty. 相似文献