Research On The Space-time Tunnel Organizational Scheme Of The Freight Transport Based On Transit Period

In recent years,with the continuous development of economy in China,the various modes of freight transportation have been gradually improved,and the requirement of the freight transport timeliness.However,at the present stage,railway freight transport is still an organizational mode of transport,with a low degree of streamline combination,and it is difficult to effectively guarantee the timeliness and specific location of freight transport.During the whole process of transportation,the build of the railway freight transport time tunnel system is helpful to improve the level of railway streamline combination,and to ensure the timeliness of railway freight transport.This paper first summarizes the main research methods of railway freight transportation organization technology.Secondly,analyze the whole production process of railway freight transport,and on this basis,the time tunnel theory system of railway freight transport is constructed,and the time tunnel organization scheme is formed.Thirdly,the paper analyzes the current development status of the freight transit period,combining with the time distribution of each stage of railway freight transportation,improved the freight transit period which added the redundant time.Fourthly,construct the space-time network diagram of freight transportation.On the basis of the organization scheme of space-time tunnel theory,the spatial model of space-time tunnel is constructed by combining the selection of traffic flow path and train marshalling plan.In addition,on the basis of the freight transit period,combining with the traffic flow continuation plan and the integrated railway blocking and timetabling problem,this paper constructed a time tunnel model and designed the genetic algorithm.Finally,the feasibility of the model is verified by using the vehicle-flow transportation network formed by seven main freight stations of Harbin bureau.Through the case verification,the time-space tunnel transportation system can effectively guarantee the goal of streamline combination and provide adjustment space for the freight transport.The traffic flow path obtained from the spatial model is combined with the train marshalling plan,and the results of traffic flow distribution meet the requirements of stream-line combination.On the basis of the spatial model,the time model takes the shortest time of the train in the station as the goal,obtains the continuous scheme of the direct train streamline,divides the train flow from the perspective of time,and improves the time reliability of cargo transportation.The time and space tunnel transportation system can well coordinate the relationship between the main organization and technology,and improve the timeliness of goods transportation.