摘要
车流运行速度和需求安全距离存在着动态的对应关系,需求安全距离与实际车辆间距之间的随机动态关系是车辆速度离散在空间上的物理表征.引入"格林希尔治"交通流模型,建立实际车辆间距与需求安全车距差值计算模型,并推导出不同运行速度下车辆间距与需求安全距离差值对车辆运行安全的影响程度计算模型.结果表明,运行速度对运行安全的影响范围在车辆间距小于需求安全距离的速度范围之内,车流的运行速度并非越大越不安全,而是随着速度的增加危险程度先增加后减小.最后运用试验数据对模型进行了验证分析.
There is dynamic relation between traffic flow speed and required safe distance. The stochastic dynamic relationship between required safe distance and the actual distance between vehicles is the physical characterization for speed difference in space. The model of difference calculation between actual vehicle spacing and required safe distance is achieved by Greenshields Traffic-Flow-Models,and the influence model of moving vehicle safety for the difference in different speed is established. The results show that vehicle speed can influence the vehicle safety only during the vehicle spacing less than the required safe distance; the vehicle moving speed is not unsafe as increasing, but increases, then decreases. Finally, the model is validated by the experimental data.
出处
《青岛理工大学学报》
CAS
2012年第6期1-5,共5页
Journal of Qingdao University of Technology
基金
国家自然科学基金资助项目(51178231)
国家科技支撑计划资助项目(2009BAG13A03)
关键词
交通流
速度离散
需求安全距离
交通安全
traffic flow
speed difference
required safe distance
traffic safety
