Characteristics and Model of Vehicle Flow Fluctuation Based on Molecular Dynamics

Abstract

This paper is based on molecular dynamics and systematically analyzes the fluctuation characteristics of traffic flow. Vehicle following behavior is affected by the leading vehicle and road environment, its operating speed and acceleration present random fluctuations. Abstract the vehicle into interacting molecules, construct molecular following model based on molecular dynamics. Collect the traffic flow characteristic data of test section sample points, study vehicle speed and acceleration fluctuation characteristics, derive of acceleration wave sensitivity coefficient model from the molecular following-up model. Based on the sensitivity coefficient of acceleration fluctuation characteristic, analyze the relationship between acceleration fluctuation and vehicle flow status systematically, study the evolution law of traffic flow in free flow state, synchronous flow state and blocking flow state. Traffic flow fluctuation is the spontaneous behavior of driving vehicles to restore dynamic balance by the driving or stimulation of traffic events, it provides theoretical basis for dynamic characteristics of traffic flow under the background of intelligent network traffic.