Research On The Running Plan Of Urban Rail Transit Trains On Large And Small Roads Based On Flexible Marshalling

With the urban rail transit developed rapidly in recent years,many urban rail transit lines have a huge passenger flow and an uneven distribution of passenger flow of time and space.Daily passenger traffic such as Shanghai and Beijing has more than 10 million,and the distribution of passenger flow at different times of the day is also significantly different.The traditional single-group and single-route urban rail transit has caused that some sections are lake of transport capacity or flush of that.It is unreasonable distribution that reduced passenger satisfaction and increased corporate operating costs.Therefore,it is of great significance to scientifically and rationally study the operation plan of large and small roads based on flexible marshalling of urban rail transit.The use of operation organization mode of flexible marshalling or large and small roads reduces passenger waiting time and improves passenger satisfaction;at the same time,it reduces the number of trains on the line and the number of kilometers traveled by vehicles,which reduces the operating cost of the enterprise and ensures the service level and attraction of urban rail trains.On the basis of existing research,this paper summarizes the key technologies and influencing factors that limits the flexible marshalling,and an optimization model for urban rail transit train operation plan based on large and small roads considering passenger satisfaction is established,and analyzes the adaptability and stability of the model through case studies.The main contents and conclusions are:(1)Combining the existing literature,it analyzes the marshalling types and large and small roads of urban rail transit trains,and analyzes their respective advantages and disadvantages,adaptability,and application practices.Studies have shown that the multi-grouping,large and small roads can match passenger flow and transportation capacity to a relatively high level,which adapts to the temporal and spatial differences of passenger flow.Not only does it meet the transportation needs of passengers,but also save business operating costs,but it also has a high opinion of stations and line equipment and facilities.(2)This paper analyzes the key technologies and influencing factors that limits the flexible marshalling.urban rail transit train operation plan,based on the line feasibility report and distribution characteristics of the time and space passenger flow and cross-section passenger flow,has been established to make its crossing location,departure frequency and number of train formations.Among that,the characteristics of passenger flow changes are the main content of the analysis of the train operation plan.And the line layout,the effective length of the platform,the turn-back capacity of the turn-back station,the design of the door and the screen door,the coupler buffer device,the number of vehicles,the type of vehicles,the signal system and conditions,facilities and equipment are the prerequisites for whether the plan can be generated.finally,by considering train service accessibility,economy,comfort and safety,as well as corporate operation and management costs,investment costs,etc.,a scientific and reasonable urban rail transit train operation plan can be formulated.Optimal matching of capacity and demand,and enhance the atteaction of urban rail transit.(3)Having the lowest generalized travel cost for passengers,the smallest number of kilometers traveled by vehicles,and the smallest number of trains on the line are objective function.The train departure frequency,number of train formations,full train load rate,number of vehicles used,and location of large and small roads intersections are used as conditions.The optimization model of the train operation plan based on the large and small roads is constructed,and the algorithm is designed to solve it in the end.Obtain the number of train formations,train frequency,train turn-back point,etc.in the case of large and small crossings.Case analysis shows that the multi-mode grouping scheme is more adaptable and has a higher optimization rate than a single mode.Sensitivity analysis of related parameters shows that in the actual urban rail transit train operation line,by changing the ratio of large and small trains and adjusting the train operation diagram,the waiting time of passengers can be reduced,and passenger satisfaction can be improved.The plan can also be realized by adjusting the maximum number of trains.When the parameter passenger-kilometer fare rate p and the average time value θ of passengers change,the generalized passenger travel cost and the optimal objective function value are in inverse and proportional relations.At the same time,the stability and reliability of the model are verified based on sensitivity analysis.