Study On The Coordinated Optimization Of Bus Timetable Considering The Choices Of Multi-line Transfer

With the rapid development of cities in China and the continuous growth of the urban population,the per capita car ownership has also increased sharply,resulting in increasingly serious problems such as urban traffic congestion and traffic pollution.Urban public transport has the advantages of large passenger capacity,low cost,less per capita road area occupied and high transport efficiency.In recent years,the rapid development of public transport system to alleviate urban road traffic congestion is widely recognized by the society.At the same time,with the improvement of people's living standards,people's requirements for bus services are becoming higher and higher,especially in bus operation scheduling,passengers are eager to get bus services that are more punctual,more efficient and more responsive to changes in passenger flow.As the basis and core link of public transport operation plan,the bus timetable takes on the task of balancing the interests of public transport operation enterprises and public transport passengers,and it is the link between them.Therefore,the quality of bus timetable directly affects the operation efficiency of enterprises and the satisfaction of passengers.Firstly,it introduces the research status and related theories of the preparation of urban bus timetables at home and abroad,explains the basic types of bus timetables,and the main influencing factors of timetables preparation.Based on the analysis of the operation relationship of bus lines,the number of transfer stations between lines and the types of transfer stations,the passenger transfer methods are discussed.Furthermore,it is determined that the research object of this paper is intersecting lines and co-linear lines.The research objectives are the waiting time of noninterchange passengers on each line and the waiting time of a single transfer station on intersecting lines,and the total waiting time of continuous multiple optional transfer stations in collinear section of collinear line is the shortest.At the same time,it introduces bus passenger flow data collection and analysis methods,and elaborate on the identification process of bus passenger boarding station,getting off station and transfer station.Secondly,considering the vehicle capacity limit,the types of detained passengers and the additional waiting time for detained passengers are discussed by the time when the vehicles arrive at the interchange station of the two intersecting lines.Aiming at the shortest waiting time for passengers(including non-transfer waiting time and transfer waiting time),taking the vehicle departure interval as the decision variable,using the company's existing capacity resources to restrict the minimum departure interval of the line,and establishing the bus timetable optimization model of intersection line;for passengers within the common line segment,to study the difference in station selection preferences,use the MNL model to analyze the factors affecting passenger transfer station selection,and establish the passenger station selection behavior probability function under each influencing factor,based on the transfer demand between lines,using the station selection probability function calculate the transfer amount of each station in the common line segment,and then take the passenger waiting time of each line and the shortest total transfer waiting time of multiple transfer stations in the common line segment as the objective,take the vehicle departure interval as the decision variable,and use the existing transportation resources of the enterprise to restrict the minimum departure interval of the line and establish the bus timetable optimization model of the common line.Design genetic algorithm to solve the model,and provide a basis for timetable compilation.Finally,this paper takes the two intersecting lines of No.7 and No.261,three common lines of No.228,No.263 and No.25 in Changchun City as the research object,and calculates the distribution law of passenger flow and line operation data.Uses the optimization model of bus departure interval established in Chapter 3 and Chapter 4 to solve the non-uniform departure interval of each line,compiles bus timetables of different lines without changing the first departure time of the vehicle,and verifies the validity of the model.