Research On Optimization Of Rolling Stock For Urban Rail Transit Under Network Operation Conditions

In the context of the continuous advancement of the construction of urban rail transit network in my country and the increasing proportion of urban rail transit in public transportation,rail transit group are also constantly purchasing vehicles to meet the needs of passengers through the network,increasing the number of trains online.As the power resource for the operation and production of the rail transit group,the train needs to be weighed between meeting the needs of passengers and saving operating costs.In the interconnected urban rail network,on the basis of completing the operation tasks of each line in the network,how to efficiently formulate the operation plan can reduce the number of trains,improve the efficiency of trains,and reduce operating costs.It is worthwhile Top Questions for Research.Therefore,this thesis studies the preparation of the train circulation planning on the condition that the urban rail line is formed into a network,and lays a certain theoretical experience for the rail transit group to implement the network operation in the future:On the basis of analyzing and summarizing the research status of networked operation and train application of urban rail trains at home and abroad,it first expounds the meaning of networked operation and its characteristics,and introduces various operation modes through domestic and foreign line operation examples.After meeting the technical conditions for operation under the conditions of forming a network,it is necessary to draw out how to use the resources of train and depot.Then it discusses the specific meaning and classification of the train circulation planning,the specific contents and characteristics of the preparation of the train circulation planning,and the various factors that will change the number of trains in the operation.And the indicators that can be selected after the plan preparation is completed to evaluate the preparation quality of the plan.In addition,based on the idea of the multi-travelling salesman problem(MTSP)problem,an optimization model of the urban rail train circulation planning under the network conditions is constructed,and the genetic algorithm is improved according to the characteristics of the urban rail train circulation planning,the unbalanced transportation exists in the design line network due to the tidal passenger flow,and the train circulation planning under the unbalanced transportation mode is solved.Thirdly,due to the regulations of train operation loss and the safe operation of urban rail,the train needs to be inspected and maintained for a certain mileage or a certain period of time.Therefore,considering the maintenance operation,the train circulation planning model is constructed with the number of train used online and the number of train maintenance are the least,and the above-mentioned algorithm ideas are also used to join the under-vehicle overhaul cycle to calculate the under-vehicle overhaul plan.Finally,use the constructed three-line network and the established train operation plan to solve the train circulation planning under the unbalanced transportation mode,and compare it with the independent operation plan of each line to verify the unbalanced transportation under the network condition,it can save the train resources to a certain extent.And solve the train circulation planning considering the maintenance operation,and verify that the train yard resources can be reasonably allocated and shared in the online network.