摘要
为研究山区高速公路不同车型的车速分布特征以及车型分类方法,基于包茂高速水江—南彭段主线ETC数据,从概率分布、累计频率分布和特征值方面分析了平缓路段和连续下坡路段中ETC系统内全部车型的行程速度特征,并以车速平均值和标准差作为聚类指标,用K-means聚类方法对不同车型进行聚类分析。结果表明:平缓路段客车速度集中于80 km/h左右,货车集中于70 km/h左右,而在连续下坡路段车辆整体表现为低速行驶,客车速度集中于70 km/h左右,货车集中于60 km/h左右;三型客车和四型客车在平缓路段倾向于将速度维持在稳定幅值而在连续下坡路段有向期望车速靠近的趋势;客车在平缓路段速度分布较分散,在连续下坡路段速度分布相对集中,而货车速度分布趋势正好相反;连续下坡路段的速度离散性大于平缓路段,事故发生概率增加;同一线形路段不同车型间速度分布存在明显差异,部分车型速度分布特征指标表现出一定的聚集性,说明部分车型速度分布有较大的相似性。将平缓路段车型聚为四类:一型客车、二型客车与一型货车、三型客车与四型客车、二~六型货车;连续下坡路段车型聚为三类:一型客车与三型客车以及四型客车、二型客车与一型货车、二~六型货车。研究结果可为山区高速公路车型精细化速度管理和同类别车型限速方案的制定提供依据。
In order to study the speed distribution characteristics and types of vehicle classification methods of different types of vehicles on mountainous expressways,based on the ETC data of the main line of Shuijiang-Nanpeng section of Baotou-Maoming Expressway,from the aspects of probability distribution,cumulative frequency distribution and eigenvalue,the travel speed characteristics of all types of vehicle from the ETC system in the gentle section and in the continuous downhill section was analyzed.With the average speed and standard deviation as clustering indicators,the K-means clustering method was uesd to clustere different types of vehicle.The results show these as follows.The speed of passenger cars is concentrated at about 80 km/h and trucks is concentrated at about 70 km/h in the gentle section,while the vehicles in the continuous downhill section show low speed,the speed of passenger cars is concentrated at about 70 km/h and trucks is concentrated at about 60 km/h.The speed distribution of type 3 passenger cars and type 4 passenger cars tend to maintain the speed at a stable amplitude in the gentle section,while tend to approach the desired speed in the continuous downhill section.The speed distribution of passenger cars in the gentle section is relatively scattered,and the speed distribution in the continuous downhill section is relatively concentrated,while the speed distribution trend of trucks is just the opposite.The speed dispersion of the continuous downhill section is greater than that of the gentle section,the accidents probability increases.There are obvious differences in the speed distribution of different types of vehicles in the same road section,the speed distribution characteristic indexes of some types of vehicles show some aggregation,which indicate the speed distribution of some types of vehicles has great similarity.The flat road models are clustered into four categories:type 1 passenger cars,type 2 passenger cars and type 1 trucks,type 3 passenger cars and type 4 passenger cars,type 2~6
作者
张诗
杨子邈
黄杰
徐进
ZHANG Shi;YANG Zi-miao;HUANG Jie;XU Jin(College of Transportation,Chongqing Jiaotong University,Chongqing 400074,China;Chongqing Expressway Group Co.,Ltd.,Southern Operation Branch,Chongqing 401300,China;Chongqing Key Laboratory of“Human-Vehicle-Road”Cooperation&Safety for Mountain Complex Environment,Chongqing Jiaotong University,Chongqing 400074,China)
出处
《科学技术与工程》
北大核心
2023年第35期15269-15278,共10页
Science Technology and Engineering
基金
国家重点研发计划(2018YFB1600500)
重庆市高校创新研究群体项目(CXQT21022)。
