Integrated Hierarchical Structure Design Of Urban Multi-modal Transportation Network Based On Travel Time

With the rapid development of the economy,the level of urbanization has increased,and the scale of urban multi-modal networks has continued to expand.However,due to the lack of multi-network integration and low travel efficiency has caused many problems and the contradiction between supply and demand for commuting has become increasingly serious.In the urban multi-modal network,through reasonable and effective multi-modal network hierarchy,a reasonable and efficient multi-modal network structure is established to solve the problem of inconsistent connection between single transportation networks and poor operation of urban transportation system,so that multi-modal transportation The network plays a role as a whole in urban traffic operations.This paper takes urban multi-modal transportation network and urban transfer hub as the research object,and analyzes the traffic characteristics of various modes of transportation based on the analysis of traffic function of “passability and accessibility” to reveal the relationship between travel time and integrated network.Take commuter traffic crowds as the research environment which is combined with demand distribution,multi-modal network structure characteristics,and the role of hubs(functions,layouts)for travel time constraints(reliability guarantee)to propose a method of Urban multi-modal network hierarchy division based on travel time.Firstly,the research on each single transportation subnet is carried out to understand the traffic characteristics of each single transportation mode and the method of network hierarchy division.Then,by analyzing the single network classification index and the research on the characteristics of multi-mode network,the unified index of multi-modal network hierarchy is obtained as Speed,passenger Transportation Intensity,general travel costs and capacity.As multiple transportation networks interface with each other,the multi-mode network will change its functionality as a whole.Take the division of the single network level function as entry points,and let multi-modal network be qualitatively divided into four levels from the perspective of network function.Secondly,it analyzes the network structure characteristics of urban multi-modal transportation network and analyzes the characteristics of traveler's single mode travel mode and combined travel(P+R transfer and regular bus + track)mode.It also analyzes the components of multi-modal transportation network and constructs an impedance function that reflects the actual line section resistance of the multi-mode network.Describe the travel impedance under different combined travel modes and establish a multi-modal network topology based on the super network model for the actual road network.Then based on the stochastic user equilibrium model which the traveler's travel cost is the lowest objective function and the MSWA algorithm is used to solve the model,allocated the actual commute traffic volume.Finally,propose the multi-modal network index threshold determination method.By clustering the multi-mode network partition indicator data,the multi-mode network level partitioning index threshold is obtained.Based on the above research,a multi-mode network hierarchical design method is proposed,and the hierarchical structure of urban multi-modal transportation network is established.The research on the multi-modal transportation network level change after the demand growth is carried out,and puts forward the corresponding improvement suggestions.