Study On The Optimization Of Formation Plan Of Multi-shipment Direct Train In Railway Loading Area

In recent years,railway construction has been integrated with the concept of green and environmentally-friendly development.The state has vigorously advocated the development of railway transport and promoted the transfer of bulk and ordinary bulk cargo transport to railways.In this context,it becomes more and more important to improve the efficiency of freight transportation and optimize the train formation plan.Optimizing the train formation plan is an effective means to improve the efficiency of railway freight transport.The formation plan is to meet the demand of aging of freight transport and reduce the burden of adaptation of technical stations along the way by the railway transport department through the overall arrangement of freight flow on the loading ground.It is of great significance to optimize the railway freight organization structure and strengthen the freight marketing in China.Therefore,this paper mainly includes the following aspects:(1)This paper analyzes the development trend of the multi-shipment direct train in the loading area,summarizes the conditions for organizing the multi-shipment direct train,and emphatically analyzes the characteristics of two typical organization modes of the multi-shipment direct train to the unloading area and the non adjacent technical station for adaptation.(2)This paper analyzes the mechanism of the organization optimization of the multi-shipment direct train from the aspects of loading station operation time,saving time without adaptation operation on the way and unloading station operation time,and draws the conclusion that the multi-shipment direct train is suitable for the organization of multiple freight flows with relatively concentrated freight flow direction.(3)The objective function is designed to minimize the sum of the additional waiting time of vehicles,the operation cost of loading and unloading vehicles,the cost of vehicle kilometers on the way and the adaptation cost of technical stations.At last,the nonlinear 0-1 integer programming model of the multi-shipment direct train formation plan in the loading area is constructed.In order to solve the model,the linear processing is carried out.(4)Taking the loading area composed of cangzhou,botou and dongguang on the southern section of beijing-shanghai line as an example to verify the feasibility of the model in this paper.First of all,is it suitable for organizing step through trains? Then bring the relevant data into the step through train formation planning model,and solve the problem with the help of optimization software LINGO.Then,enlarging the scale of road network to verify the efficiency of the software.The results show that the model can optimize the train flow distribution scheme and path of each loading station at the same time,it provides a reference for the railway transportation department to make train formation plan.There are 28 figures,23 tables and 65 references.