Characteristic Analysis And Optimization Of Urban Multi-mode Public Transport Network

Urban public transport system is not only a vital part of the urban transportation system,but also one of the important transportation modes in the daily travel activities of residents.At present,large cities in China have basically completed the layout of conventional public transport network,and the rail transit network has begun to take shape.On this basis,the optimization of public transport network has become the focus of research.How to make an objective,comprehensive and scientific observation and analysis of the urban public transport system and further put forward an optimization scheme based on the actual situation is very important to the development of the urban public transport system.Based on the relevant theories of complex network,this paper models and analyzes the urban conventional public transport network and rail transit network to study their overall characteristics.First,this paper constructs the conventional bus sub-network and rail transit sub-network based on the Space-L modeling method,and gives a composite method to construct the multi-mode public transport composite network model.Then,this paper compares and analyzes the topology and robustness of Changchun multi-mode public transport composite network and conventional bus subnetwork.The results show that compared with the conventional public transport network,the composite network with rail transit has improved in terms of topology and robustness.Based on the constructed network model and characteristic analysis results,this paper constructs the weighted composite network of urban multi-mode public transportation based on the passenger travel impedance and optimizes the public transit network.First,according to the travel process of passengers on public transport,this paper analyzes the travel impedance of passengers on public transport,and divides the passenger travel impedance into node impedance and connecting impedance.The calculation models of waiting time at station,stopping time at bus stop,driving connection and transfer connection are constructed respectively,and the network connection is weighted according to the passenger travel impedance between nodes.Then,this paper calculates the passenger travel path selection probability according to the uncertainty of passenger waiting time and ride time,and improves the calculation method of network global efficiency according to passenger travel impedance,travel route selection probability and passenger volume.Taking the improvement of the global efficiency of the network as the objective function,the optimization model of public transport network is established and solved by ant colony algorithm.Finally,combined with the principle of ant colony algorithm,the model solving method is given,and the MATLAB software is selected to program.Combined with the example analysis,the optimization model and algorithm are applied,and the optimization results are compared and analyzed,which proves the rationality and practicability of the urban multi-mode public transport network optimization model.