Research On Train Operation Planning Of Unban Rail Transit With The Consideration Of The Balanced Transport Capacity Utilization Based On Through Train Services Mode

With the continuous expansion of urban rail transit network in China,the amount of passenger undertaken by it has been going up rapidly and the passenger flow distribution has been becoming more and more complicated.As a result,the existing single-lineoperation-mode and the "shallow level" network-operation-mode can no longer meet the needs of both passengers and enterprises.Problems such as poor passenger travel experience and organizing difficulty of passenger flow in transfer stations have become urgent.The through train services can create conditions for the implementation of diversified and flexible means of train operation,which is expected to be the fundamental way to solve the above problems.However,the diversified and flexible means of operating organization put forward higher requirements to the enterprise’s transporting organization project.The train operating scheme is the core foundation of enterprise transporting organization project and few existing researches have optimized it from the perspective of interconnection-operation.On the basis of these,this paper takes the train operation scheme under the operation mode of through train services as the research object.Based on fully analyzing the theories about interconnection and train operation plan,a multi-objective optimizing model of operation plan that considers transport capacity utilization is built.It is transformed into a single-objective model by The ε-restraint mean,then the single-objective model is solved by a correspondingly designed genetic algorithm.Finally,the paper takes the "Y" shaped line that plan to be interconnected in Beijing as an example to verify the dependability and practicability of the model and algorithm.The details are as follows:(1)Based on particular analysis of typical forms and application scenarios of line interconnection,the passenger flow conditions and equipment and facilities conditions required for cross-line operation of line interconnection are described in detail.And the contents and influence factors of the operation scheme are micro-elaborated from three aspects including the train routing scheme,train marshalling scheme and train stop scheme,Summarizing the basic steps of the train operation plan.(2)The "alternative route set","alternative route strategy set" and "directed hypergraph theory" are elaborated in order to settle the troubles of "large number of routes","diversified route layout" and "high complexity of train service network" in the case of interconnected lines.Designing a "two-stage" path search algorithm that can improve the efficiency of path search under interconnection.Based on analyzing the affecting factors of the behavior about passenger travel path choice,the improved Logit passenger flow allocation model is introduced to reasonably allocate passenger flow into routings on network.(3)A mixed integer programming model considering passenger demand,equipment capacity,train load rate and organizational complexity is established to optimize the utilization of transport capacity resources,minimize the operating expense of the enterprise operating and minimize the number of times about passenger’s transfers,determining the optimal train routing plan,departure frequency and train marshalling scheme.(4)This paper takes the ‘Y’ shape line that consists of Changing Line and Line 8 as a case study.On the basis of determining its "alternative route set","alternative route strategy set" and "passenger travel route set",the optimization model and solving algorithm established in this paper are used to generate the approximate Pareto optimal solution of this case.By analyzing and comparing several performance indexes between the approximate Pareto optimal solution and the optimal operation plan under the singleline-operation mode in the case,some conclusion can be made that on the basis that the operating costs of the enterprise remain basically unchanged,the operation mode of interconnection can greatly improve the balance degree of enterprise transport capacity utilization,the level of passenger service and the organizational stress of passenger flow at the transfer nodes of unban rail transit network,which verified the superiority of interconnection-operation-mode.There are 36 figures,14 tables and 51 references...