Impact Of Passenger Behavior And Flow Structure On Train Routing Scheme Of Y-type Urban Rail Lines

With the development of the city,the demand of passenger flow is more and more.The Y-type line expands the radiation scope through the extension of the branch line and connects passenger flow.But at present,the train routing scheme of Y-type line mainly considers whether the transport capacity can meet the passenger flow demand of the section,and ignores the passenger safety problems in the vehicle interior and platform.In addition,the applicability analysis of different routing schemes for Y-type line is not deep enough.Therefore,this paper mainly discusses the applicable conditions of different routing schemes of Y-type line,as well as the safety boundary conditions of train and platform load.The main work and conclusions are as follows:(1)The paper analyzes four routing schemes and its influencing factors of Y-type line,summarizes the cases of Y-type line of rail transit and its operation organization mode at home and abroad,which lay the foundation for the compilation of train routing plan for Y-type line.(2)Taking into account the different passenger behavior,the paper sets the departure frequency of main and branch routes as an integral multiple and the overlapping interval of main and branch routes as a uniform departure,and takes the minimum total cost of passengers and enterprise as the objective function to establish the train routing planning model of Y-type line.The effectiveness of the model is verified by an example.The proportion of through passenger flow(the ratio of the passenger flow from the branch line to the main line and the internal passenger flow of the branch line)is used to describe the passenger flow structure of the Y-type line,and the proportion p of the passengers preferentially choosing through passenger flow is used to describe the choice behavior preference of the passengers.The sensitivity analysis of η and p is carried out,and the values of η and p are taken respectively.A total of 121 scenarios are cross combined to obtain the optimal routing scheme under different scenarios.The results show that passenger flow structure and passenger choice behavior will affect the optimal routing scheme.When only increasing the proportion of through passenger flow,the optimal routing scheme changes from independent operation to combined operation,and finally to through operation.When only the passenger choice behavior is changed,with the increase of p,the optimal routing scheme changes from combined operation to through operation.(3)Combined with the train operation organization mode of Y-type line,the calculation method of the maximum full load rate of the train under the through operation scheme of the branch line is proposed,and the train load is checked.In the original case,the train full load rate is less than 100%.Through the sensitivity analysis,it is found that with the increase of the proportion of through passenger flow,the maximum full load rate of the train shows an upward trend;with the increase of the proportion of the priority direct passengers,the maximum full load rate of the train shows a downward trend;with the increase of the scale of passenger flow,the maximum full load rate of the train shows an upward trend;when the scale of passenger flow increases by 75%,the maximum full load rate of the train begins to exceed 100%.(4)The gathered passengers are divided into inbound passengers,outbound passengers and transfer passengers.Based on the rule of periodic arrival of trains,the change of the number of different types of passengers gathered at the platform is analyzed.Under the condition of constant departure interval of trains,this paper puts forward the calculation method of the maximum number of people gathered at each platform under the independent operation scheme of Y-type line.The ratio of the number of people gathered on the platform and the safety capacity of the platform is used to express the capacity of the platform.The research shows that with the increase of the proportion η of through passenger flow,the capacity rate of the platform increases and the safety level of the platform decreases;with the increase of the proportion p of the priority direct passenger flow,the capacity rate of the platform decreases.In the original case,p is 0.5,η is 3.27.At this time,the capacity of the platform is in the safe range.However,when p decreases to 0.4 or η increases to 4,the platform capacity begins to exceed the safety threshold.