Train Planning Optimization For Network Combined Operation Mode Of Urban Rail Transit

The scale of urban rail transit network in China is expanding.In order to meet the diversified travel demand of passengers and take into account the operating costs,it is necessary to combine the characteristics and advantages of different networked operation modes and study on the optimization method of train operation plan.By the through operation mode,the "direct" travel between two or even more lines can be realized.The fast and slow train operation mode can realize the long-distance passenger's "fast" travel.In view of this,this paper carries out in-depth analysis on the optimization of train operation scheme under the network combined operation mode,which is composed of the through operation and the fast and slow train operation.The main research work and achievements are as follows:(1)Summarize the connotation and advantages of the network combined operation mode,analyze the advantages of the through operation mode,the fast and slow train mode and the passenger flow conditions and engineering conditions needed,and summarize the basic principles of adopting the network combined operation mode.To refine the optimization of train operation schemes under the network combined operation mode,we need to focus on the following issues:the large number of feasible operation schemes under the network operation mode;passenger flow assignment should be adapted to the special travel characteristics of passengers;increased factors to be considered in building models and other questions.(2)In the light of traffic characteristics of passengers in networked combined operation mode,a passenger flow assignment method based on "optimal travel strategy" is proposed and verified.The construction of service train based topology network reflects the diversity of service train under the network combined operation mode.The passenger flow allocation method of "optimal travel strategy" is introduced in detail.The generation model of "optimal travel strategy" is constructed,and the passenger flow assignment process based on "optimal travel strategy" is realized by combining the optimal travel strategy search algorithm and path generation algorithm.A design example is given to illustrate the advantages of the passenger flow assignment method based on the "optimal travel strategy" in the network operation mode.The results show that the method can more truly describe the flexible and autonomous choice behavior of passengers when facing multiple service train choices.(3)The optimization model of urban rail transit operation scheme under the network combined operation mode is constructed.In order to minimize the combined costs of operators and passengers,the constraints of operation complexity,network accessibility,passenger flow demand,line capacity,service level and line capacity loss are taken into account.At the same time,the train routing,departure frequency and stopping schemes are optimized.The optimization algorithm is designed to solve the model,and the validity and applicability of the model are verified by an example.The results show that the model is applicable under different passenger flow distribution conditions and different engineering conditions,and it can not only solve the optimal operation plan when passenger flow and engineering conditions are known and provide operational decision support.In the case of uncertain engineering conditions,it can also solve the optimal operation plan according to passenger flow conditions,and provide decision support for engineering conditions design.(4)Taking the local line network of Chongqing Rail Transit Line 4-9 as the research object,the optimization method of train operation scheme based on network combined operation mode is applied as an example.From the viewpoint of passenger flow demand and engineering conditions,this paper analyses the necessity and feasibility of adopting the network combined operation mode in the railway network,and finds out the optimal train operation scheme,and compares it with the optimal train operation scheme under various operation modes,which embodies the advantages of the network combined operation mode.The results show that:In this paper,the optimization method of train operation scheme under the network combined operation mode is proposed to support the reduction of operation cost and passenger cost on the basis of meeting passenger travel demand.