地铁潮汐客流下变编组列车不成对运行图优化OA北大核心CSTPCDEI

Tidal passenger flow with uneven distribution in directions is common in urban metro systems in large cities.The emerging variable marshalling technology provides a new method to deal with tidal passenger flow.In order to solve the problem that the passenger demand and capacity are difficult to match under the tidal passenger flow,the train timetable,marshalling scheme and rolling stock circulation were coordinated for a bidirectional line with double-ended depots,and the unpaired train timetable with variable marshalling was compiled considering the uncoupling and coupling operations of the rolling stocks on the turn-back tracks at both ends of the line.The unpaired timetable optimization model under variable marshalling was constructed under the constraints of four aspects,such as train arrival and departure time,passenger flow,rolling stock circulation and turn-back tracks occupation,with the goal of minimizing the weighted sum of total cost of passengers and company and proportion of entering and exiting depots operation in rolling stock circulation.The variable neighborhood search algorithm and the greedy algorithm were integrated to solve the model.The former updated the train arrival and departure time and the train marshalling in the train timetable,while the latter solved the corresponding rolling stock circulation plan.To verify the validity of the model,a case study of first-stage project for the Batong line of Beijing metro with tidal passenger flow characteristics was carried out.The results show that the uncoupling and coupling operations mainly occur at the terminal stations of the large and small passenger flow directions in the morning rush hour,respectively.Variable marshalling reduces the total cost of both passengers and company by 8.28%and 4.82%as compared to single large group and multi-group,respectively,and lessens the train running kilometers and the number of serviceable vehicles while ensuring the service quality.Compared with multi-group,variable marshalling reduces 26.02%of the proportion of entering and exiting depots operation in rolling stock circulation and 20.51%of the times of train entering and exiting depots operations,respectively.This can effectively reduce the influence from marshalling type on rolling stock circulation and improve the utilization rate of vehicles through the online uncoupling and coupling operations.The research results provide a basis for the selection of train marshalling scheme and the operation organization of variable marshalling.