Heavy-haul railway cooperative transportation organization considering the utilization of vehicle resources
In order to optimize the utilization of heavy-haul railway vehicle resources and promote the"cost reduction and efficiency increase"of railway logistics enterprises.By taking the heavy-haul railway as the background,taking the coal and non-coal demand as the transportation task,minimizing the cost of transportation,combination,disassembly,and connection of trains,as well as the cost of transporting goods as the goal,and considering the requirements of the marshalling type of the train and the continuity consistency of the vehicle type,the optimization model of the loaded and empty train cooperative organization was constructed to coordinate the outbound coal transportation,the return non-coal transportation and the allocation of empty trains.First,a 7-station single-channel line case was designed,and the Gurobi solver was used to solve the case,and the transportation organization scheme was obtained by analyzing the solution results,and the effectiveness of the model and the feasibility of the scheme were visually demonstrated.Then,the transportation network connecting 20 railway stations in the SH Group was selected as a case study.Only the type of vehicle was considered,and the experiments were carried out in the scenarios of tight capacity and sufficient capacity.Second,based on the above experiments,the return demand was further taken into account,and the experiments were carried out in two capacity scenarios.The results show that in the experiment with only the difference of vehicle types,the transportation cost increases by 7.0%and 8.3%under the two demand scenarios,respectively,but this scheme is more feasible because it considers the distribution of different types of vehicles and their non-mixed characteristics.After taking the return demand into account,the total cost increased by only 1.03%and 1.06%compared with the control group,and the average transportation volume undertaken by the vehicle increased by 1.16%and 1.18%,respectively,which reduced the waste of return capacity.Moreover,in the case of the abundance of different types of vehicles,the transportation cost of the transportation scheme based on the C80 and C70 train models is smaller.The results of this study provide a reference for organizing the use of freight vehicle resources at a smaller cost and refining the organization of heavy-haul railway outbound and return transportation.
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