摘要
针对山区公路弯道多事故的特点,以福州宦溪镇至鼓岭景区山区公路为研究对象,使用无人机航拍记录小型汽车以自然行驶状态通过弯道路段的运行情况,并使用AE和Autocad软件获取车辆连续轨迹和速度变化资料,分别用平均行驶速度和85%位速度与弯道半径及纵坡等进行多项式关系模型拟合.结果表明:车辆入弯至接近曲中阶段,小型车减速情况与某速度临界值相关,接近曲中至出弯阶段车辆运行状态随半径、坡度变化表现出不同的运行状态;弯道坡度较小时,上坡平均速度和85%位速度均略高于下坡时的值;半径较大弯道,平均速度、85%位速度明显高于半径较小弯道;平均速度和85%位速度与半径及纵坡均满足多项式关系,且使用平均速度拟合相关性更高.
Mountainous highways are prone to frequent traffic accidents.To alleviate this problem,driving data of small vehicles under natural condition were recorded continuously at road curves by unmanned aerial vehicle.Secondly,AE and Autocad softwares were used to work out the continuous trajectory of the vehicles and speed variations,based on which polynomial models depicting the relations between average speed or 85% percentile operating velocity and curve radius and longitudinal slope were further developed.Findings indicated that vehicle deceleration was related to the critical value of a certain velocity when it travelled from the beginning to the middle of the curve;the running condition of the vehicle fluctuated along with road radius and slope when the vehicle approached to the curved end from the middle.When the slope of the curve was small,average speed and 85% percentile velocity were slightly higher in uphill roads than downhill roads;when the radius of the curve was large,average speed and 85% percentile velocity were relatively higher than those on the curves with smaller radius.Average speed or 85% percentile velocity,and curve radius and longitudinal slope can be fit into polynomial models,among which correlation coefficient from the model derived from average speed was the highest.
作者
张旺
林慧
郭建钢
李林
刘丹丹
ZHANG Wang;LIN Hui;GUO Jiangang;LI Lin;LIU Dandan(College of Transportation and Civil Engineering,Fujian Agriculture and Forestry University,Fuzhou,Fujian 350002,China)
出处
《福建农林大学学报（自然科学版）》
CSCD
北大核心
2020年第1期140-144,共5页
Journal of Fujian Agriculture and Forestry University:Natural Science Edition
基金
国家自然科学基金资助项目(51608123)
福建省自然科学基金资助项目(2017J01475,2017J01682)
关键词
山区公路
弯道路段
小型汽车
速度特性
自然行驶
mountain highways
curve
small vehicle
speed characteristics
natural driving condition
