Research on the nonlinear characteristics of traffic flow system under different scalings
The fact that the traffic flow system is a complex and nonlinear system is extensively accepted by academe.The quantitative depiction research on complexity,nonlinearity of traffic flow system is now in the ascendant.This paper focused on the problem that how system scaling affects the complexity degree of a system.Firstly,Lyapunov index,relevancy dimension and the Lempel-Ziv algorithm were introduced for scientific depiction of the nonlinear characteristics of traffic flow system.Based on measure,3 actual time headway sequences and 3 20s-period traffic flow sequences were gained.By the simulation of the traffic flow system,5 traffic flow sequences were obtained whose periods were 1 min,2 min,3 min,4 min and 5 min,respectively.By calculating the Lyapunov index,relevancy dimension and Lempel-Ziv complexity degree of above traffic flow sequences,it was found that chaos,fractal and high complexity degree existed in the time headway sequences,but the complexity degree was gradually reduced with the gradually increasing scaling.So four conclusions and two hypotheses (i.the complexity degrees of the same system are different under different scaling; ii.negative correlation exists between the complexity degree and the depicting scaling of a system to a certain extent) are obtained.
nonlinear characteristic traffic flow chaos fractal complexity degree.
Feng-tao Liu
Management School,Donghua University,Shanghai,China
国际会议
International Conference on Modelling,Identification and Control(模拟、鉴定、控制国际会议)
上海
英文
2008-06-29（万方平台首次上网日期，不代表论文的发表时间）