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针对具有随机时延的网络控制系统(NCSs),研究其建模与系统分析问题.运用层次时间颜色Petri网(HTCPN)对以PLC为控制器的NCSs进行结构保留形式建模,并以新颖的方式将网络丢包和乱序现象与系统模型结合.重点分析系统中传感器-控制器、控制器-执行器随机时延分布情况,建立时延与网络中数据包运行情况间的关系.在此基础上,利用Baum-Welch算法建立两种时延的隐马尔科夫模型(HMM),进一步验证了HTCPN模型与HMM的等效性.
In order to solve the problems of modeling and system analysis of networked control systems (NCSs) with random time delay, the NCSs with PLC as the controller are modeled by the Hierarchical Time Colored Petri Nets (HTCPN) Way to network packet loss and out of order with the system model combined with the focus on analysis of the system sensor - controller, controller - actuator random delay distribution, the establishment of the delay and the network packet operation between the relationship in this On the basis of this, two kinds of hidden Markov models (HMMs) are established by Baum-Welch algorithm to further verify the equivalence between HTCPN model and HMM.