Traffic Flow Fluctuation Characteristics And Stability Analysis Based On Molecular Dynamics

With the rapid growth of traffic demand,existing roads are faced with huge traffic pressure,and it is difficult to change the current congestion by building new road traffic facilities.How to solve the problem of normalizing road traffic congestion and how to relieve traffic congestion has become the focus of current traffic research.The interaction behavior characteristics and models of following and changing lanes between vehicles are studied from the micro level.At the macro level,the study on the fluctuation characteristics,propagation mechanism and stability of traffic flow provides theoretical support for traffic flow situation analysis and control optimization.The research results can provide technical support for the analysis of traffic congestion,ease of traffic congestion pressure,improve the running safety of vehicles and the road capacity.First,according to the characteristics of molecular dynamics,the vehicle following process is divided into states and the model is constructed.Starting from the reasons for lane change,the influencing factors of lane change and the feasibility of lane change,the full speed difference expansion model based on the classic FVD model was constructed by comprehensively considering the influence of driver response time,lateral deviation of surrounding vehicles and lane change type.Secondly,between the relationship of the model and the macroscopic traffic flow is established to study the mechanism of macroscopic traffic flow fluctuation.Based on the theory of traffic flow mechanics,tries to explain the wave propagation property of traffic flow from the evolution of molecular physical state according to analyzes the generation,propagation and dissipation of the wave phenomenon.Thirdly,the paper USES perturbation method to study the stability mechanism of traffic flow,analyzes the change of traffic movement state under perturbation and simulation the internal mechanism of traffic stability.Finally,According to the multi-source traffic information data to analyzed the parameters of the established FVD expansion model,and conduct the simulation comparison between the extended model and the classical FVD model and OV model.The molecular following model and FVD expansion model can better analyze the internal change mechanism of vehicle operation and provide a basis for the study of macroscopic traffic flow fluctuation.This paper explains some traffic flow phenomena caused by traffic fluctuation propagation process,such as ghost traffic jam,from the change of molecular state,and then verifies the relationship between driver reaction time and speed change by means ofsimulation analysis of experimental data,proving that speed fluctuation is the main cause of vehicle loss stability;The comparative analysis of the model shows that the full-speed differential expansion model based on classical FVD is more stable and can better simulate the actual driving behavior.Further explore the influence mechanism of micro vehicle driving behavior on the macro traffic flow operation,and improve the stability of the traffic flow cluster operation,which provides theoretical basis and technical support for improving the stability of the traffic flow,relieving traffic pressure and realizing the vehicle-road cooperative driving technology.