Study On Optimization Of High-Speed Railway Train Connection Scheme

With the network operation of high-speed railways in China,the organization problem of transfer passenger flow between medium and long distance stations has become increasingly prominent.The existing train connection scheme cannot meet the efficient travel demands of passengers due to low connection frequency and long connection time.The train connection scheme is an important link of the organization plan for high-speed rail passenger transport and an important constraint of the train operation map drawing.It is of great significance to meet the high efficiency transfer demand of passengers and ensure the high quality transfer of passengers.This paper studies the optimization of high-speed train connection scheme based on the operation status of high-speed railways in China.The main contents are as follows:(1)Summarize the current research status of relevant theories on train connection schemes at home and abroad.By analyzing the existing research results,this paper points out the adaptability of optimization problem of high-speed railway train connection scheme,analyzes the existing problems,and determines the research direction and content.(2)Introduce the relevant theories of high-speed railway train connection scheme.First of all,the definition of train connection scheme studied in this paper is defined,and the elements of train connection scheme are expounded,and the combination mode of train connection is analyzed.Secondly,this paper discusses the transfer mode of passenger and the evaluation index of service level of train connection scheme.Finally,the optimization principle of high-speed railway train connection scheme is introduced.(3)Study the optimization method of high-speed railway train connection scheme.First of all,the establishiment process of three different train connection schemes are introduced.Secondly,it analyzes the service level of the train connection scheme in the existing train operation diagram and points out the areas need to be optimized.Finally,from the perspective of same station transfer optimization and different station transfer optimization,minimize the train connection time and maximize the proportion of OD in the train connection scheme as the optimization goal,the optimization model of highspeed railway train connection scheme is established by adjusting the train time and train connection relations,seting up train connection time constraint,skylight time constraint and the maximum number of connections of a single train constraint,and a layered solution strategy of the model is also proposed.(4)Taking the four vertical and four horizontal high-speed railway network as the background,the case tudy of train connection scheme is analyzed.First of all,the definition and classification of long-distance passenger flow OD are determined.Python programming software is used to generate the high-speed railway connection scheme that needs to be optimized,and the value of model parameters is determined.Secondly,by setting the adjustment ranges of three different train departure time,use IBM ILOG CPLEX software to solve the optimization model of train connection scheme,the optimization results of the same station transfer and different station transfer connection scheme are obtained.Finally,the optimization results are analyzed and summarized.The results show that under the adjustment range of three kinds departure time of trains,the connecting time of the same station and the different station transfer connection scheme is reduced,the connecting scale of the trains is increased,a considerable proportion of train connection schemes at different stations are optimized for the train connection scheme at the same starions,and different OD levels of passenger flow correspond to different purposes of connecting trains to service levels.When the departure time is adjusted within the range of-20 to 20 min,the train connection scheme of same station transfer of high-speed railway achieves the best optimization effect,the number of train connections increases by 9.8%,and the total train connection time shortens by 4,149 minutes.When the departure time adjustment range is-30?30min,the train connection scheme of different station transfer of high-speed railway has the best optimization effect,the number of train connection increases by 71.7%,20.2% of the train connection at different stations are optimized for the train connection at the same station,and the total train connection time shortens by 3,303 minutes.