The Vehicle Driving Offset Characteristic Of The Continuous Curve Of The Fourth Grade Highway In Mountain Area

In recent years, with the rapid growth of transportation and economy, the cars has entered the ordinary homes, while traffic accidents increased rapidly. Related research shows that the curved section of the traffic accident rate is usually higher than that of the straight sections, from the vehicle trajectory, the main reason of the accident is vehicles running track cross or larger offset. Related research shows that the two condition are contribution 50% and 55% to the entire curve section accidents. Continuous curve is a common linear of low grade highway, the vehicle lateral wandering is a common phenomenon. However, at present the study on the continuous curve is lack in our country, which has important practical and theoretical significance for studying the driving track offset characteristics on the vehicle.First of all, this paper analyzes the dynamic characteristics of the vehicle in the curve section. From the vehicle steering principle and the tire side partial two aspects of vehicles on the road corner analysis the force characteristics; From the roll and sideslip state of curved section analysis the vehicle driving lateral stability. By analyzing the force characteristics and lateral stability, determined the factors influencing the stability of road corner.Secondly, determined the factors and the scheme of the experiment based on the vehicle running track of our country and abroad researches, and then collect and analysis vehicle speed, vehicle type, driving direction and the vehicle running track offset etc. data in the fourth grade road in mountain area under different continuous curved sections. At the same time, classify and calibrate the vehicle driving direction and driving track offset.Finally, this paper analyzes the vehicle track offset characteristics under different influence factors. Based on analysis of the data, using a two methods:intuitive analysis and anova test, investigate the different factors that affect the vehicle driving track offset variation and different factors and vehicle trajectory offset influence degree. The study found that section location, vehicle type, driving direction, operating speed and different radius combined continuous curves has a significant effect on vehicle driving track offset. At the same time, based on the analysis of the test data and the kinematic characteristics of vehicles, established the relationship between the offset of the moving track and the running speed of vehicles.