摘要
针对不良天气造成高速公路路面附着系数和能见度减小的情况,从运动学原理出发,将汽车制动停车过程分为驾驶员反应、制动系协调和全制动3个时间阶段,推导了制动停车的安全距离,得出一种适用于不同路面条件(干燥、微湿、积水、积雪、结冰)的停车视距计算模型.结果显示,基于该模型能够进行较精确的高速公路不同路面条件下安全车速及间距的分析与修正.在此模型基础上以陕西省西宝高速公路为例,给出了不同附着系数和能见度下的安全车速和间距,结果在确保行车安全中车速符合实际情况,车距保持在能见度下限左右.
In order to deal with the reduction of road adhesion coefficient and poor visibility due to bad weather, a method is proposed for safety-speed analysis and calculation, which is suitable for different road conditions. Based on the kinematics principle, the car＇s braking process is divided into three successive phases, driver-reaction phase, braking system cooperation phase, and full braking phase. In addition, the safe braking distance is deduced and then a computational model for stopping sight distance is obtained for different road conditions （dry,slightly wet ,water-covered,snow-covered and ice-covered surfaces）. The model can be used to analyze and revise the safe speeds and distances on different road conditions. With Xibao Freeway in Shaanxi Procinces as an example, the safe speeds and distances with different adhesive coefficients and visibilities are figured out by this model. The results show that the speeds and distances given by the model can make automobiles running safely.
出处
《西安工业大学学报》
CAS
2012年第1期25-30,共6页
Journal of Xi’an Technological University
关键词
高速公路
停车视距
安全车速分析
路面条件
freeway
stopping sight distance
analysis of safe speed
road surface conditions
