Research On Optimization Of Rail Transit Feeder Bus Network In Non-equilibrium Urban Network

With the rapid development of China's economy and the rapid growth of vehicle ownership,traffic congestion has become an important problem that restricts the development of cities in our nation.In order to solve the problem of traffic congestion,large and medium-sized cities in China have begun to build subway,light railway and other rail transit systems.The rail transit lines are mostly based on the main passenger corridor in the city,which coexist or cross with a large number of conventional bus lines,as a consequence the competition and cooperation with the passenger flow has been produced.In order to optimize passenger flow organization and improve the efficiency of transportation,the transport between conventional bus and rail transit has become a vital research topic.The Non-equilibrium road network refers to the distribution of urban road network is inhomogeneous,they are mostly distributed in the banded and mountainous cities which are greatly influenced by natural environment.Because of the particularity of the physical distribution of road network,the congestion problem of these cities is more prominent,the track planning for rail transit and the transport between bus and rail transit also have its unique characteristics.Therefore,be aimed at the characteristics of this kind of road network,the optimization research of transport between bus routes and rail transit is very important for the integration of urban public transport,the improvement of the overall efficiency and service level of public transport system,and the remission of traffic congestion.This thesis analyzes and compares the characteristics of rail transit and conventional public transport.Combine the Non-equilibrium road network concept pattern with the road network characteristics,the factors affecting the optimization of transport between rail transit and bus routes are clarified.Introduce the road resistance coefficient,a multi-objective optimization model is established based on the combination of passenger time cost and bus operation cost,and select NSGA-II multi-objective genetic algorithm to solve this problem.Combined with the characteristics of the model,the algorithm is optimized and verified by a standard example.According to the characteristics of Non-equilibrium road network,a contrast verification example is designed for the optimization of small-scale transport between rail transit and bus routes,and the accuracy of the model is verified by the optimized NSGA-II multi-objective genetic algorithm.Finally,the typical Non-equilibrium road network city Lanzhou was studied,and the part of the road network "wasp-waisted road" was selected,use the model and algorithm of the thesis,the simulation of transport between bus line and rail transit optimization is carried out based on the four stations of Lanzhou Metro Line 1 and 36 bus passenger stations.The comparative analysis results show that the optimized route effectively avoids the road with high resistance coefficient,improves the capacity of transportation and achieves a more optimized layout.