Study On The Correlation Analysis And Energy Dissipation Of Traffic Flow Induced By Traffic Bottlenecks

With the development of social economy, the traffic problem is becoming prominent,; which has greatly restrict the development of social economy. Traffic bottleneck is an important reason inducing traffic congestions which influences the traffic capacity and get rise to serious pollution. Traffic flow system is a typical self-driven system which far from equilibrium, and the evolution of traffic flow is complex nonlinear dynamics problems. In the empirical findings, many traffic phenomena on roads are complex and nonlinear, such as phase transition, start-stop waves, and cluster formation, and so on. The traffic bottlenecks can be seen everywhere in real traffic, which get rise to many complex traffic congested patterns. Many problems of traffic congestions and the complex traffic phenomena induced by traffic bottleneck are not clear. Therefore, the traffic flow research is significant not only in engineering value, but also in scientific importance. In this paper, a two-lane model with partial reduced lane was proposed based on the Kerner-Klenov-Wolf (KKW) cellular automaton model. We study the three traffic phases and the time series near the entry of the bottleneck and the energy dissipation of traffic flow induced by traffic bottleneck. The work of this paper is as following:1. We study the correlated characteristics of the synchronized flow emerges at the traffic bottleneck. By using the rescaled range analysis (R/S) method to calculate the Hurst exponent, we can obtain the long-range correlated characteristics of the synchronized flow phase at a traffic bottleneck. In periodic boundary condition, the length of the bottleneck has impact on the change of the Hurst index. The results indicate that in open boundary condition the injection rate and removal rate and the location of the bottleneck have influence on the change of the Hurst index.2. Based on the previous model, we study the traffic time series correlation analysis of synchronization flow in a two-lane model with partial reduced lane based on the Kerner-Klenov-Wolf (KKW) cellular automaton model. The local measurement of the flow and density diagram, cross correlation near the entry of the traffic bottleneck have been analyzed. The typical two-dimensional scatter diagram is obtained by local measurements of the density and flow in the KKW model near the entry of the reduced lane. By using the detrended fluctuation analysis (DFA) method, we can obtain the long-rang correlated characteristics of the synchronized flow phase at a traffic bottleneck. In periodic boundary condition, the length of the bottleneck have impact on the change of the scale exponent. The results imply that in the open boundary condition the injection rate and removal rate and the location of the reduced lane have influence on the change of the scale index. Comparaed with the KKW model, the NaSch model is long-rang anti-correlation in the free flow and traffic jam.3. Transportation energy dissipation has aroused high attention of the decision-makers. In this paper, energy dissipation of traffic flow with partial reduction cellular automaton model was proposed, base on KKW model and Kinetic energy theorem. In periodic boundary condition, the energy dissipation near the traffic bottleneck discussed in details. The local energy dissipation and local density diagram obtained near the traffic bottleneck are presented. Simulation results show that the length of the reduce lane have different impact on the traffic capacity. The maxing velocity and the length of vehicle have different impact on the energy dissipation of traffic flow. In open boundary condition, the influence of injection rate and removal rate on the traffic energy dissipation is study. The results show that the injection rate and removal rate have different impact on the traffic capacity and the energy dissipation.