Research On The Optimization Of The Organization Of Direct Transportation To The Loading Area In The Case Of Inconsistent Tonnage Of Traction

Railway transportation has the advantages of large transportation volume,small environmental impact and low unit energy consumption.It is the preferred transportation method for bulk cargo transportation.However,because the construction of railways has different standards in different periods and different regions,not all the traction settings of the railways in my country's railway network are the same.In this way,the optimization of the organization of direct transportation is more complicated.At present,for the direct trains at the loading place,if the paths passing through have different traction fixed numbers,there are two general strategies: one is that the direct trains add and subtract shafts on the way,and the other strategy is based on The lowest traction fixed number organizes the running of under-axis direct trains.When the direct train runs under the axle,although it can pass through the various weight stations without change,saving the extra working time due to the supplement and reduction of the axle,it wastes the traction capacity of the locomotive and the line passing ability of the section.This article mainly studies the direct transportation organization at the loading site without the operation of reducing the shaft.The main research work and innovations are as follows:(1)For the departure direct train solution from the loading place to the technical station or unloading place on the way,in addition to the costs incurred by the vehicle flow at the loading place,during transportation and at the unloading place,this paper also considers the case where the number of traction along the way is different In the next section,the traffic flow in some sections is increased due to under-axis operation and the loss of tons and kilometers.(2)For the direct trains of multiple trains that are merged and organized from the loading place to the marshalling station,when the traction of the direct train route section is not uniform,on the basis of calculating the under axle loss of each train,different In the car flow combination scheme,the number of columns per day is a function of the decision variable,and the intermediate variable of the number of trains is embedded in the description of the under-axis running loss formula.(3)In the construction of the model,this article introduces the point-to-point direct intensive loading and unloading vehicle constraint conditions,which replaces the symbolic function in the traditional model to determine the conditions of the large vehicle flow,making the model more linear.In addition,the transportation loss of the train running under the axle in the direct section is included in the objective function for optimization,making the model more realistic.There are 6 figures,4 tables and 45 references...