Optimization Of Wagon Flow Assignment With Transship Work Among Multiple Marshaling Stations In Railroad Terminal

Railway freight transportation plays an important role in my country’s transportation field,and railway hubs are the core part of the entire railway network.Whether the railway hub can operate efficiently or not has a huge impact on the operation quality of the railway network.It is of great significance to improve the efficiency of railway hubs to relieve traffic flow,make up for the shortcomings of railway transportation and increase market share.Based on the introduction of the composition of the traffic flow in the hub,the technical operation process of different types of traffic flow and the general scheme of the railway hub traffic organization,this paper gives the concept of marshalling yard transfer operation,and analyzes the single marshalling station railway junction and the multi-marshalling station railway junction.In the two scenarios,the optimization problem of traffic flow organization considering the transition operation is studied in detail,and the main research contents are divided into two parts:Firstly,the optimization problem of traffic flow organization of a single marshalling station railway hub considering the transfer operation in the marshalling station is studied.The goal is to minimize the running cost of trains entering and leaving the station,the cost of traffic flow reorganization and the cost of train assembly and waiting.The disintegration,assembly,marshalling and departure capabilities,as well as the traffic exchange capacity between different shunting systems in the marshalling station,establish a mathematical model,and use a small-scale example to verify the feasibility and rationality of the optimization model.Secondly,the optimization problem of multi-marshalling station railway junction traffic organization considering the transfer operation between marshalling stations is further studied,and the mathematical model is established with the goal of minimizing the cost of train running,assembly and reorganization.According to the characteristics of the model,comprehensively considering the railway direction,station capacity and the limitation of the number of freight vehicles in the hub,a hybrid heuristic with two stage(HHTS)is designed for solving.The matching scheme of the shunting system,and the matching scheme is adjusted and tested according to the line passing-disassembly ability of the bottleneck section;in the second stage,the four phases updating procedure(FPUP)is used to complete the iterative optimization of the matching scheme.Finally,the results are tested by examples of different scales.The results of an example show that the HHTS strategy proposed in this paper has better solution quality.This paper studies the optimization problem of railway junction traffic organization under two scenarios,broadens the research scope of corner traffic yard operations,proposes a railway junction traffic organization method considering the effective division of labor in marshalling yards,and gives a two-stage fusion strategy solution strategy,which It enriches the theory of vehicle flow organization and scheduling in railway hubs with multiple marshalling stations,and also provides a certain reference for adjusting the actual railway transportation organization.