针对离散型车间存在的现场数据釆集手段落后、物料配送低效混乱等问题,提出一种基于无线射频识别(Radio Frequency Idenfication,RFID)物联网的离散型车间物料输送系统。该系统作为离散型制造执行系统(Manufacturing Execution System,M...针对离散型车间存在的现场数据釆集手段落后、物料配送低效混乱等问题,提出一种基于无线射频识别(Radio Frequency Idenfication,RFID)物联网的离散型车间物料输送系统。该系统作为离散型制造执行系统(Manufacturing Execution System,MES)的基本组成部分,为离散型MES提供RFID设备采集的实时生产进程信息和物料输送信息。并接收离散型MES发出的物料输送命令,然后运行实时路径优化算法,以最短的路径将物料送往目的地。展开更多
This paper aims to present a simulation model for heterogeneous high-speed train traffic flow based on an improved discrete-time model(IDTM).In the proposed simulation model,four train control strategies,including d...This paper aims to present a simulation model for heterogeneous high-speed train traffic flow based on an improved discrete-time model(IDTM).In the proposed simulation model,four train control strategies,including departing strategy,traveling strategy,braking strategy,overtaking strategy,are well defined to optimize train movements.Based on the proposed simulation model,some characteristics of train traffic flow are investigated.Numerical results indicate that the departure time intervals,the station dwell time,the section length,and the ratio of fast trains have different influence on traffic capacity and train average velocity.The results can provide some theoretical support for the strategy making of railway departments.展开更多
文摘针对离散型车间存在的现场数据釆集手段落后、物料配送低效混乱等问题,提出一种基于无线射频识别(Radio Frequency Idenfication,RFID)物联网的离散型车间物料输送系统。该系统作为离散型制造执行系统(Manufacturing Execution System,MES)的基本组成部分,为离散型MES提供RFID设备采集的实时生产进程信息和物料输送信息。并接收离散型MES发出的物料输送命令,然后运行实时路径优化算法,以最短的路径将物料送往目的地。
基金Supported by the National Basic Research Program of China under Grant No.2012CB725400the National Natural Science Foundation of China under Grant No.71222101+1 种基金the Research Foundation of State Key Laboratory of Rail Traffic Control and Safety under Grant No.RCS2014ZT16the Fundamental Research Funds for the Central Universities No.2015YJS088,Beijing Jiaotong University
文摘This paper aims to present a simulation model for heterogeneous high-speed train traffic flow based on an improved discrete-time model(IDTM).In the proposed simulation model,four train control strategies,including departing strategy,traveling strategy,braking strategy,overtaking strategy,are well defined to optimize train movements.Based on the proposed simulation model,some characteristics of train traffic flow are investigated.Numerical results indicate that the departure time intervals,the station dwell time,the section length,and the ratio of fast trains have different influence on traffic capacity and train average velocity.The results can provide some theoretical support for the strategy making of railway departments.