Study On Driving Stability By Crosswalk In Curving Section Of Expressway Based On Vehicle-road Coupling

The vehicles on the strong crosswind section of mountain expressway are often affected by crosswind,while the curving section is more seriously threatened by the crosswind.Due to the complex linear shape of the curving section,the risk of accidents is greatly increased under the action of the strong crosswind.Therefore,it is of great significance to study the driving stability of vehicles on the winding section of expressway under the action of crosswinds.Based on the comprehensive consideration of the complicated factors of crosswind,vehicle and road,this paper analyzes the linear design index of the complex section of winding slope of expressway from the perspective of vehicle dynamics.This paper focuses on the accident prone pattern and the main factors affecting the traffic environment safety of the winding section of the expressway under the crosswinding environment.This paper analyzes the mechanical characteristics of the vehicles on the winding section of expressway under the action of crosswinding,and constructs a critical safety model of vehicle-road coupling under the action of crosswinding.Taking the standard value as the initial condition,the limit value of the main critical design indexes of accidents in different combination sections of curves and slopes under the action of crosswinds is calculated quantitatively,and the sensitivity of the indexes affecting the vehicle driving safety is obtained.Car Sim simulation platform is used to simulate the influence of different crosswind conditions and different road alignment design combinations on vehicle driving stability,and the vehicle stability evaluation index is used to analyze the vehicle movement change law and verify the rationality of the safety degree model.Combined with a certain section of Zhangjiakou highway,the threshold of highway alignment index and the probability of vehicle failure failure in each section under the action of different crosswind are given,which provides guidance for the driving safety guarantee of winding section of mountain expressway.