关键词: 铁路运输, 放宽条件定点集结, 排队系统, 批到达, 批服务, 最小编成辆数

Abstract:

The assembly mode determines the end condition of a car assembly process. Time-fixed assembling is a highly efficient mode, which is propitious to improve transport quality. For the problem that cars assemble in a marshalling station in the time-fixed mode with soften terms, a discrete time queuing model with batch-arrival and batch- service was built. Queue length distributions at departure epochs were obtained based on the embedded Markov chain technique. Next, queue length distributions at arbitrary epochs were derived. Based on these probabilities, various performance measures of interest such as the mean queue length, the mean accumulation delay, efficiency, traffic volume in one day were discussed though analyzing the impacts of minimum number of cars, batch size distributions, arriving intensity, service time distributions. The analysis shows that these factors have significant effect on the system performance. Therefore, this model can be used to provide decision references for the delicacy management of the marshalling yard and optimization of car flows.

Key words: railway transportation, time-fixed assembly mode with soften terms, queuing system, batch arrivals, batch service, minimum number of cars