Study On Operation Mechanism And Control Of Self Organization Traffic Flow In Urban Road Net

City traffic is one of the important problems restrict the development ofmodern city. City traffic problems seriously affect the city transport efficiency ofpassenger and cargo, sustainable development of city and trip of urban residents. Atthis stage, city traffic problem, which traffic congestion has become the norm andtraffic emissions cause city continuous fog haze, serious impact on the efficiency ofcity traffic and public health. Self organization theory can describe working of trafficsystem. Application of self organization theory research on city road traffic flowsystem is, grasp the operation mechanism of city traffic system, characterizationchange process of city traffic system operation state, defined the current traffic stateaccording to the collected traffic parameters and prediction to change of the trafficsituation. Study of traffic flow based on self organization theory, which help trafficmanagers master the traffic situation and trend, formulate the corresponding trafficcontrol strategy, to reduce the city traffic congestion, reduce people’s travel timeconsumption, improve the speed of vehicles movement, fundamentally solve thecity traffic problem, and promote the healthy development of city traffic. Based onthat reason, this paper is devoted to the study of city road traffic flowself-organization operation mechanism and control method. The main researchwork includes the following content:Study on traffic flow system of city based on organization theory. Introduce thedevelopment of self-organization theory and important branch of self-organizationtheory. At the same time, determine the characteristics which self-organizationtheory study to. Define the scope of self-organization theory study. Expound the structure of traffic system and working principle of traffic flow system. According tothe characteristics of city traffic flow and the system characteristics ofself-organization theory study to, discussed the rationality of self-organizationtheory study in city traffic flow system.Study city traffic flow system self-organization working. Divide expresswaytraffic into four traffic phases, which is free phase, smoothly phase, coordinationphase and jam phase, based on degree of driving freedom. Then, research on morecomplex change of city traffic phase. Divide city road traffic into three phases basedon Analysis two driving state in city traffic and study on relationship of road trafficdensity and length of waiting queue, which is smoothly phase, coerce phase andcrowd phase. Study fluctuation mechanism of city traffic flow and promote trafficphase change by fluctuation of city traffic flow. Describe fluctuation of city trafficflow by mathematical expression.Study city traffic flow simulation based on the dissipative structure. Analysiscity traffic flow system working by application of dissipative structure theory. Trafficdissipative structure simulate from single section to road net. Establish city trafficsimulation model based on dissipative structure. Carry on the simulationexperiment. Contrast city traffic simulation by VISSIM with dissipative structureshow that the model by dissipative structure is better.Study on simulation of city traffic jam diffusion based on Sandpile dynamics.Study on queue process when city traffic jam happening based on analysis trafficcongestion mechanism. According to the characteristic of sandpile dynamics aboutcity traffic jam, establish model of sandpile dynamics about city traffic. From resultsof experimental Verification, the model of traffic simulation based on sandpiledynamics can forecast traffic jam disseminate on road net efficient.Study on traffic signal control method based on self-organization characteristicsof city traffic flow. According to the disadvantages of traffic signal control system,formulate strategy of traffic signal control based on strategy and establish the traffic signal control which switch over minimum delay and density equalization. Andresearch process of this traffic signal control. Establish optimization function ofminimum delay and density equalization signal control, and design solve method.Finally, compared with minimal delay traffic signal control and switching overminimum delay and density equalization traffic signal control. Results show thattraffic jam can be postponed by switching over minimum delay and densityequalization traffic signal control.This paper is study on simulation and control city traffic flow system. It ishelpful for city traffic management.