Research On EMU Operation Plan Based On Variable Formation Mode

Due to the difference of population density in the regions along the high-speed railway and the general time rule in production activities,the passenger flow demand of high-speed railway has certain changes in time and space,the passenger flow demand is difficult to guarantee when the passenger flow demand is small,and the unit transportation cost is large;when the passenger flow is large,the passenger flow rate is high,but the transportation capacity may not match the transportation demand.Variable marshalling is a kind of EMU operation mode which is put forward in comparison with the fixed marshalling mode with relatively fixed marshalling form.According to the change of daily passenger flow,variable marshalling technology can adjust the number of carriages of the train marshalling through the rapid reconnection and disassembly of the train,improve the occupancy rate of the train through the rearrangement of the number of passengers,improve the operation efficiency of EMU and reduce the number of passengers Less waste of resources.Under the condition of variable marshalling,this paper reprogrammes the operation plan of EMUs,and on the premise of improving the matching degree of train capacity and passenger flow,it can reduce the operation cost of EMUs and maximize the economic and social benefits while meeting the transportation demand to the maximum extent.The specific work is as follows:(1)Turn the connection problem of EMU into the MTSP,establish the connection network of EMU,which includes the train number nodes with known attributes and must be connected,and the maintenance nodes selectively connected according to the status of EMU,and the connection arc includes the time required for EMU to complete the connection task.(2)The application planning model of EMU under the condition of variable marshalling is constructed.Under the condition that the train operation diagram is known,the number of marshalling cars of each train number is adjusted according to the passenger ticket data of the day,and the optimization objective is to minimize the connection time cost and maintenance time cost of EMUs.On the basis of meeting the connection uniqueness conditions,operation line connection conditions,maintenance rules and maintenance capacity constraints of EMUs,the mixed integer programming model is constructed by using variable grouping.(3)UCT algorithm is used to solve the above model.The UCT algorithm is used to fit EMU for operation line.In the initial state of the algorithm,the search tree is empty,and the search process is carried out in sequence according to the sorted running line.The simulated reward value is used to update the information in the search tree,which provides the basis for the subsequent search until the set number of searches is achieved.The reward value is calculated by the objective function value of the integer programming model.27 Figures,19 Tables,50 Literatures.