编组站调车场股道数计算方法的探讨

编组站解编系统可以看成是一个特殊类型的排队服务系统,进入调车场的车组为顾客输入流,牵出线调机为服务机构,调车场为顾客逗留空间。本文建立了由一个集结去向的解—集—编过程所构成的排队服务系统的模型:这是一个成批到达成批服务的等待制服务系统。对于该排队系统模型很难用分析计算法求出精确解,但可用模拟方法求得近似解。本文先用计算机模拟方法求出了在牵出线负荷ρ一定的条件下,去向车流量 N_i 和其编成辆数 m_i 已知的某个去向所需占用的股道数。在考虑了各种变化条件的前提下,用正交法安排了模拟试验,再对这些模拟计算结果进行回归分析得到了任一去向所应占的股道数计算公式。而对于整个调车场股道数来讲,则可通过将各去向的应占股道数相加而得到。利用实际的数据资料对该计算方法进行验算,说明该方法是切实可行的。

A Research on the Method for Computing the Number of Sorting Sidings in a Marshalling Station

The system is regarded as a special type of queuing sys- tem.Wagon groups classified into sidings,switch locomotives and the classification yard are considered as arriving customers, servers and a waiting space respectively.This paper gives the model of this queuing system with customers both arriving and being served in batches for one destination.As we know,it is rather difficult for us to solve this kind of model.Under various conditions,according to orthogonal test method,using computer simulation of this system results in the number of sorting sidings for a certain destination.Using regression method to analyse the simulated results this paper puts forward the for- mula of calculating the number of sorting sidings needed for any destination.For a whole classification yard,the number of sorting sidings equals to the sum of numbers needed by all the destinations required in this yard.