Research On Metro Vehicle Type Selection And Grouping Scheme Based On Demand Characteristic Analysis

China is stepping up the pace of urbanization, the demand for traffic is also growing rapidly, the problem of traffic congestion in many big cities will restrict the process of urbanization. The history of urban traffic development in the economically developed countries tells us that only by using large passenger volume of urban rail transit system, can improve the urban public transport.Metro is the mass rapid transit system, the vehicle is the core equipment of rail transport system, vehicle selection and grouping scheme is related to the project scale, system transport capacity, operation organization and so on. In the metro vehicle selection, only focusing on the passenger volume and the highest traffic volume of the section two numerical values, while ignoring other characteristics of passenger flow may have far-reaching impact on the system, which causes the transport capacity of many systems is not compatible with the actual traffic situation. Therefore, this paper in considering demand characteristics has an important influence on subway system planning and operation, to establish comprehensive decision method of subway vehicle selection and marshalling scheme, and applied to practical problems, in order to make the right decisions for the future of urban rail transit planning, design work, to support the sustainable development of urban rail transit.First, in terms of the relevant state regulations and industry standards, technical conditions for metro vehicle, train marshalling, comfort configuration impact on metro vehicles and marshalling system analysis.Second, the use of systems engineering model to analyze the demand characteristics and influencing factors, to distinguish between decision demand characteristics and influencing factors of the level and the relationship between primary and secondary, and makes a quantitative research on the main contradiction, obtained the intrinsic link between the related factors and mutual influence relations.Finally, the demand characteristic of system analysis result is used to metro vehicle selection and marshalling scheme study, constructing fuzzy comprehensive decision model, to verify the feasibility of the model on Chengdu Metro Line 7, recommend the most suitable vehicles long-term equipment plan, and the corresponding development plan.