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Study on the Effects of Vehicles to Start and Energy Dissipation Based on Cellular Automaton Models of Mixed Traffic

Author: LiuQiang
Tutor: XueYu
School: Guangxi University
Course: Theoretical Physics
Keywords: cellular automation mixed traffic flow detention time start times start probability energy dissipation
CLC: U491.112
Type: Master's thesis
Year: 2013
Downloads: 49
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Abstract


With the fast development of economy, the improvement of the living standard of people, the implementation of the policy of city planning and the increase of the amount of vehicles in our country, the urban transportation system in China is facing more and more pressure. Twenty years ago the long queue of vehicles in traffic jamming is rarely be meet, but now what we fear most is to encounter with it every day, especially in the rush hours. It brings a series of more and more negative effects, such as traffic accidents, traffic congestion and environmental pollution problem and so on. The loss of China’s annual GDP by traffic congestion is up to5%and8%. It is found by investigation that:the starting of cars or idle state of car causes the emissions of the most carbon monoxide, and the carbon monoxide seriously harm to our health. Thus, it is very important to develop the traffic science.Traffic flow is a interdisciplinary subject and is related to physics, mathematics, computer, engineering and environment and so on. In this paper, we mainly focus on the study of the urban traffic problem. By using the cellular automaton traffic flow model, some problems such as the detention time, the effects of starting and the energy dissipation of on-ramp transportation system in traffic flow is simulated and analyzed. The main work in the Master’s thesis is as follows:(1) Based on NaSch model and TT model, the detention time is analyzed in mixed traffic flow, and the definition of detention time for cellular automaton traffic model is proposed. By the numerical simulation, we can obtain that the detention time of vehicles increases with the growth of the occupied rate of the road, and it consistent with theoretical results.(2) Based on NaSch, VDR, and BL cellular automaton model of the mixture traffic flow, the starting times in per unit time, the start probability in per unit time and start energy consumption are studied, and their definition were given. Simulation results show that:the total trends of the starting times in per unit time, the starting probability in per unit time and starting energy dissipation in the periodic boundary conditions are that grow first and then reduce. When p=1, the entire lanes are occupied by vehicles, all vehicles stopped, so the starting times in per unit time, the start probability in per unit time and start energy consumption are relatively small and approach zero. Not only there are relations between the effects of starting with the occupied rate of the road, but also with the evolution rules.(3) The energy dissipation of on-ramp transportation system was studied through computer simulation based on the VDR model. The effects on energy dissipation under different rates of car injected in on-ramp, different rates of car injected in main road and different rates of car exiting the main road are studied separately.Finally, we give the conclusions of our works and present the prospect of study for traffic flow.

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CLC: > Transportation > Road transport > Technical management of traffic engineering and road transport > Traffic engineering and traffic management > Traffic Survey and Planning > Traffic survey > Traffic flow
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