An Analysis And Modeling On Urban Traffic Management And Control Systems On The Basis Of Systems Dynamics

With the process of economic globalization, the scales of cities have increased rapidly and thus trafficcongestion has already become a generally faced problem in big cities. The problem is more serious in ourcountry, which has a large population and a rapidly growing economy. Under this background, it is importantas well as urgent to build an urban traffic management and control systems to organize and control traffic flowin a more scientific way, to give fully play to the potential capacity of the existing traffic network and the wellorganization of the traffic flow.This dissertation builds modeling to the complicated urban traffic network control and management systemwith the systematic dynamics method and analyzes relevant effects of factors of feasible traffic policiesthrough simulation results. In this dissertation, this modeling is applied to the Tianjin traffic network controland management systemin Tianjin. The main contents of this dissertation include three parts:(1) The structure of flattened traffic flow network control and management system is analyzed. Firstly,the traffic flow network control and management system is introduced. Secondly, the signal control and trafficguiding system are introduced. Finally, the traffic demand management system and the traffic organizationsystemin artificial systemare introduced in order to have a more specific knowledge to the overall system.(2) Models of each subsystem is build in a systematic dynamic way, including traffic demand, trafficorganization, traffic scheduling, signal control and traffic guide. The modeling objective, modeling idea ofeach subsystem is analyzed and model boundaries are confirmed and system circulation is realized by theanalysis of causality. Simulation of each subsystemis made.(3) Starting from the main line, system model is built by integrating each subsystem. Through softwaresimulation, the evolution trends of the average delay, the equilibrium rate as well as the traffic load areanalyzed. Also, the sensitivity analysis about main control and policy factors in the system is made. Byevaluating effects of those above-mentioned indexes and comparing it with actually situations, the model isverified to be able to reflect actual situation. Feasible suggests are made to improve the state of the urban traffic network. The model is applied to the traffic flow network control and management system in Tianjin.By analyzing the actual road network structure in Tianjin, simulating with software and then comparing theresult with the actual situation, the rationalityand expansibility of the model is verified.Through the completion of the study contents, this dissertation has proposed a practical analysis on systemdynamics research framework of urban traffic flow complex system. The analyses on the traffic flow complexsystems will be broken down into various micro sub-models, and each sub-model relationship is shown indetail, thus the overall system modeling is completed. Aseries of simulation proof the reasonable and scientificof the proposed framework. In addition to the theoretical simulation system, the system will be truly applied tothe actual scene among the networks in Tianjin's traffic flow building management and control system, andplaya positive role.