共查询到19条相似文献,搜索用时 187 毫秒
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基于Internet的远程控制系统网络时延分析研究 总被引:1,自引:1,他引:0
提出并研究基于Internet的远程控制仿真,在测量网络时延实际数据的基础上,利用滑动模型和样条原理,采用滑模均值代替滑模的常规输入值,利用径向基神经网络建立了网络时延的模型.仿真结果表明:该模型能够反映并预测该测量数据所代表的网络路径之间的时延特性,并能在基于Internet的闭环控制系统的设计中有效地替代实际网络进行研究.该建模方法具有快速、准确的特点,能用于在线学习网络模型并对网络的时延值进行预测,为基于Internet的远程闭环控制提供了新的思路. 相似文献
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异构网络链路传输控制系统设计 总被引:1,自引:0,他引:1
《现代电子技术》2018,(9):49-53
针对传统传输控制系统存在网络吞吐量低、往返时延高等问题,提出并设计了基于数据快速活肤的异构网络链路传输控制系统。根据异构网络特点设计模块总体框图,并对初始化模块、任务调度模块、数据传输模块、图像传输模块展开分析。在传统拥塞避免算法基础上,对快速恢复算法进行优化,由此完成传输控制系统的设计。实验结果证明,该系统设计可大大提高网络平均吞吐量,降低往返时延值,改善了网络传输控制性能。 相似文献
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研究了一类不确定非线性网络控制系统的故障检测问题.当存在时变时延的情况下,基于T-S模糊模型方法建立新的非线性网络控制系统模型,并设计故障观测器,对系统进行故障检测,并给出了线性矩阵不等式形式的观测器稳定判据.通过仿真示例验证了该方法的有效性. 相似文献
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为了提高基于Internet的网络控制系统中随机时延的预测精度,提出了基于经验模式分解(empirical mode decomposition,EMD)与最小二乘支持向量机(Least Squared Support Vector Machines,LS-SVM)的一步时延预测方法.首先利用EMD将时延序列分解成若干个本征模式函数分量,分解后的分量去除了原始时延序列的长相关性,同时突出时延序列不同的局部特征.然后根据各个分量的变化规律,选择不同的LS-SVM模型分别进行预测.最后将各分量的预测值叠加得到最终的预测值.仿真结果表明本文方法具有较高的预测精度. 相似文献
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针对无线网络控制系统(WINCS)中的随机传输时延问题,研究了一种基于改进的动态矩阵控制(DMC)的网络时延补偿策略。通过在传统 DMC 的性能指标中引入参考输出与预测输出的误差变化率,滚动优化出最优控制增量序列以及未来时刻的预测输出,并从中选择适当的控制增量信号传送给执行器来补偿无线网络传输过程中随机时延的影响。最后,利用 Matlab/Simulink 仿真环境和 TureTime工具箱,以直流电机为对象建立 WINCS的仿真模型,实验结果证明了该算法处理 WINCS随机时延问题的可行性和有效性。 相似文献
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Lili Yang Shuang-Hua Yang 《IEEE transactions on systems, man and cybernetics. Part C, Applications and reviews》2007,37(2):185-192
One of the major challenges in Internet-based control systems is how to overcome the Internet transmission delay. In this paper, we investigate the potential of using the multirate control scheme and the time-delay compensation to overcome the Internet transmission delay. A two-level hierarchy is used for the Internet-based control systems. At the lower level, a local controller is implemented to control the plant at a higher frequency. At the higher level, a remote controller is employed to remotely regulate the desirable set-point at a lower frequency for the local controller. A compensator located at the feedback channel is designed to overcome the time delay occurring in the transmission from the local site to a remote site. Another compensator in the feedforward channel is designed to compensate the time-delay occurring in the control action transmission. The simulation and experimental application results illustrate that the multirate control scheme with the time delay compensation offers a promising way to efficiently reduce the effect of Internet time delay on control performance 相似文献
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针对具有时间延迟的网络控制系统,设计了基于网络服务质量(QoS)的参数自适应模糊控制器,以抑制网络时间延迟对控制性能的影响。网络时间延迟会导致控制系统性能下降甚至不稳定。因此,以反映网络实际变化情况的QoS参数为前提条件,提出了综合反映网络控制性能质量(QoP)的优化目标函数。令该函数取极小值,可以计算得到模糊控制器的最优参数。仿真结果表明,该方法能随时适应网络的变化,满足网络控制系统实际需求。 相似文献
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Yun-Bo Zhao Guo-Ping Liu Rees D. 《Circuits and Systems II: Express Briefs, IEEE Transactions on》2008,55(5):469-473
In this paper, a novel predictive control-based approach is proposed for a networked control system with random delays containing an input nonlinear process based on a Hammerstein model. The method uses a time-delay two-step generalized predictive control scheme, which consists of two parts: one is to deal with the input nonlinearity of the Hammerstein model and the other is to compensate for the network-induced delay in the networked control system. A theoretical result using the Popov criterion is presented for the closed-loop stability of the system in the case of a constant delay. Simulation examples illustrating the validity of the approach are also presented. 相似文献
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《Digital Communications & Networks》2017,3(2):112-117
Time-varying network induced delay in the communication channel severely affects the performance of closed loop network control systems. In this paper, a novel idea of compensating the fractional time varying communication delay in the sliding surface is presented. The fractional time delay in the sensor to controller and controller to actuator channel is approximated using the Thiran approximation technique to design the sliding surface. A discrete-time sliding mode control law is derived using the proposed surface that compensates fractional time delay in sensor to controller and controller to actuator channels for uncertain network control systems. The sufficient condition for closed loop stability of the system is derived using the Lyapunov function. The efficacy of the proposed strategy is supported by the simulation results. 相似文献