山区双车道公路运行速度预测模型的加速度标定

发布时间：2018-11-01 11:46

【摘要】：为标定运行速度模型中的汽车加速度值,在山区双车道公路上开展小客车连续行驶实验,采集轴向加速度的连续数据,并通过断面观测得到大客车和大货车的加速度值,获得峰值加速度的累积频率曲线以及统计分布特性,并建立加速度-道路几何参数关系模型.结果表明:小客车的入弯减速度幅值要比出弯加速度高一倍左右,不宜将加、减速度简化成同一个值,应该分别进行标定;加速度和减速度累积频率曲线的斜率突变点都不是发生在85~(th)百分位,而是临近95~(th),应重新考虑85~(th)百分位的使用价值;大客车的加、减速度幅值非常接近,而重载货车的减速度要明显大于加速度,同时,重载货车的加速度和减速度值要双双低于大型客车;小客车的加速度与弯道半径负相关,而与弯道转角正相关.
[Abstract]:In order to calibrate the acceleration value of the vehicle in the running speed model, the continuous driving experiment of the minibus was carried out on the two-lane highway in the mountain area, and the continuous data of the axial acceleration were collected, and the acceleration values of the bus and the truck were obtained by the cross-section observation. The cumulative frequency curve and statistical distribution characteristics of peak acceleration are obtained, and the relationship between acceleration and road geometric parameters is established. The results show that the amplitude of the deceleration speed of the passenger car is about twice as high as the acceleration of the exit bending, so it is not appropriate to simplify the speed reduction to the same value, which should be calibrated separately. The slope abrupt point of acceleration and deceleration cumulative frequency curve does not occur in 85 ~ (th) percentile, but should reconsider the use value of 85 ~ (th) percentile near 95 ~ (th),. The deceleration amplitude of the bus is very close, while the deceleration of the heavy truck is obviously larger than the acceleration. At the same time, the acceleration and the deceleration of the heavy truck are both lower than those of the large bus. The acceleration of the passenger car is negatively correlated with the radius of the bend and is positively correlated with the angle of the bend.
【作者单位】：重庆交通大学交通运输学院;西南交通大学交通运输与物流学院;汽车运输安全保障技术交通行业重点实验室;
【基金】：交通运输部应用基础研究项目(2015319814050) 重庆市科技计划项目(cstc2014jcyj A30024) 汽车运输安全保障技术交通行业重点实验室开放课题(2014G1502015)
【分类号】：U491

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