Study On Method Of Train Routing Planning With Its Effect Of Urban Rail Transit Under Through Operation Between Two Lines

At present,China’s urban rail transit network generally has the problem of poor transfer convenience.The through operation organization mode can meet the rapid and direct traffic needs of passengers,reduce the number of transfers,reduce the passenger flow pressure of transfer stations,and improve the passenger flow attraction of rail transit.In the existing research on the operation organization of multi routing trains,it is less related to the coordination and unity of multiple lines,and the adaptability analysis of through operation routing is not comprehensive.Therefore,taking the X-type line as the research object,this paper analyzes the route selection behavior of passengers and the loss of line carrying capacity under the through operation mode,establishes the train routing planning model under the condition of double line through operation,designs the genetic algorithm to solve it,and finally analyzes the effect of the scheme and its applicability under different conditions.The main work and conclusions include:(1)This paper analyzes the advantages and disadvantages,basic types,equipment,facilities and passenger flow conditions of through operation,and investigates the typical cases of through operation of rail transit at home and abroad and its operation organization mode.(2)The generalized cost function of passenger travel is established based on passenger waiting time and transfer time,and the passenger path selection probability is obtained through the improved logit model.Then,under the through operation between two lines,when passengers face multiple routing choices,the variation of the probability of selecting through train varies with various influencing factors.(3)Taking the passenger off-board travel time,passenger transfer times and enterprise operation cost as the objective function,the constraints are the number of stations covered by the routing,the departure frequency limit and the section passenger flow limit,and considering the influence of through operation routing on the line carrying capacity,a solution model for train routing planning under double line through operation is constructed,which is solved by genetic algorithm,The variation law of departure frequency of each route and the position of starting and ending points of cross line route in the scheme is analyzed.(4)Taking X-type lines in a city as an example,the effectiveness of the model is verified,and the optimal routing scheme under independent operation and through operation mode is obtained.The example analysis shows that compared with the independent operation scheme,under the through operation scheme,the off-board travel time,transfer times and operation cost of passengers are reduced by 9.8%,52.6% and22.6% respectively,the load of transfer station is reduced by 46.4%,the balance of train capacity is improved by 4.1%,and the utilization of train capacity is more fully.Then it analyzes the influence of objective function weight,starting and ending point location of cross line routing,proportion of cross line passenger flow,total passenger flow scale and line form of transfer station on the operation effect.The results show that: 1)The interests of passengers and enterprises are mutually balanced.2)The location of starting and ending points of cross line routing shall be reasonably selected according to the OD characteristics of passenger flow,so as to maximize benefits;3)The greater the proportion of cross line passenger flow,the more obvious the optimization effect of through operation mode;4)When the passenger flow scale tends to the line capacity,the saving effect of passenger travel time under the through mode is poor.This is because under the constraint of the capacity,the total departure frequency on the section has an upper limit.At this time,the running of cross line trains will reduce the departure frequency of trains on this line,thus increasing the waiting time of passengers on this line.On the other hand,the scale of passenger flow has increased,the utilization rate of train capacity has been more fully,and the operating costs of enterprises have been more saved;5)Under the condition of same station transfer,due to the limitation of line carrying capacity and saved transfer time,the advantages of through operation in peak hours are not obvious.There are 30 figures,22 tables and 71 references.