Study And Application Of Optimization Method Based On TransCAD For Urban Public Transport Network

In recent years,many large cities are making great efforts to look for effect measures to improve the city traffic condition. The objective of the optimization of public transport network is to make the public transport system produce the best benefit by using modern theory of transportation planning and modern computing techniques. The optimization process is to make the public transport network distribution reasonable by optimizing and combining the existing public transport capacity. It lies on the existing city road system and public transport capacity. The optimization of public transport network is an economical and effective measure to solve the traffic congestion and the difficulty in riding in large cities. It is also a measure that is easy to put in practice.The optimization of public transport network is very important, because the distribution of city public transport network will have direct effect on the travel of city residents. The optimization of public transport network is the most important task of the optimization of public transport system. Now many people concentrate on the research of this aspect .The are many methods to optimize, but most of them are difficult and complex to compute and perform. This dissertation was finished in combined with the project"Research on the development and planning of the Changchun city public transport ". It utilizes the special software of TransCAD to optimize the network and mainly researches on the bus transport network.The thread of this paper is as follows:At the beginning of the dissertation, systematically describing the ordinary objectives, the rule, the constraints, the main content and the common patterns of the adjustment and optimization of public transport network. Then, introducing the TransCAD software, which mainly includes its basic functions, how to use it to do transport planning, its fundamental models and how to set the parameters of the model. After that, on the basis of the OD matrix of the Changchun resident trips between 148 zones, which was got by the investigation of commutation tickets, carrying out the processes of trip prediction and transit assignment. At last, by analyzing the public transport actuality of Changchun city and the result of trip prediction and transit assignment, and by combining with the strategies of the city development and planning given by the Chunchun government, optimizing and adjusting the public transport network and giving some advice.During the process of the trip prediction of the Changchun city public transport, the prediction of the number of population is on the basis of the basic data of the districts and the investigation result of commutation ticket, which includes all the public transport modes, bus, rail and taxi. It uses original unit technique to predict the trips of public transport in the future year. The trips by bus can be obtained by mode split. After that, the paper chooses the SUE method of TransCAD to carry out transit assignment. It can be found from the result of transit assignment that the medium areas of the no.1, 2 and 3 will be the main districts of tip attraction. At the same time, the percentage of trip generation of some surrounding districts and the south new city zone of Changchun will increase, because of the significant increase of the number of population of these regions in the following years. These regions will be the main source of trip generation in the future. We can find from the space distribution of trips that the main trip direction of the public transport of Changchun city is one from north to the south, but the center of gravity will deviate. The trips from east to the west centered by the People Square will increase in the south with the extending of exploitation scale of new city zones such as Economic technique development area, Jingyue travelling development area and High and new technique development area. All of above suggest that we should add new public transport routes between the surrounding districts and the new city zones, so that...