摘要
为得到山区复杂公路环境下的汽车纵向加速度特性,开展了实测总里程为3 039km的实车连续行驶试验,采集了山区双车道公路自然驾驶状态下的汽车行驶速度、轨迹、加速度等运行参数,提取了纵向加速度连续变化曲线每个波形的峰值,得到了纵向加速度的累积频率、概率分布、特征百分位值等统计分布特性,分析了纵向加速度与弯道参数和行驶速度之间的关联度和敏感性,并得到了回归关系式。结果表明:减速度累积频率曲线在某一分位值之后大于加速度,斜率突变点为第90%~95%分位,第85%分位加(减)速度值分别为0.60,0.85m·s^(-2);加(减)速度概率密度曲线均为正偏态分布,驾驶人减、加速度偏好值分别为0.17,0.25m·s^(-2);平曲线半径增大时加(减)速度随之减小,平曲线转角增加时加(减)速度随之递增,但连续弯道的递增/递减趋势要比独立弯道弱,基于第85%、第95%分位和上边界驾驶行为的减速临界半径为190,225,275m,加速临界半径为204,245,290m;行驶速度提高时加速度随之下降,至90km·h^(-1)时不再有加速行为,减速度-初速度散点数据呈不等腰三角形分布,三角形顶点对应的速度值为63.4km·h^(-1)。
To investigate the performance of longitudinal acceleration for passenger cars on complex mountain roads, field test using real cars were conducted on two-lane mountainous roads with a total mileage of 3 039 km. Operational parameters of the test vehicles such as the speed, trajectory and acceleration under natural driving behaviors were collected. Meanwhile, cumulative frequency, probability distribution and percentile value of longitudinal acceleration were obtained after extracting the peak value of each waveform of the continuous longitudinal acceleration. The correlation and sensitivity between longitudinal acceleration, curve parameters and traveling speeds were analyzed. The results shows that. the cumulative frequency curve of deceleration is higher than that of acceleration after a certain percentile; mutation point of cumulative frequency curve＇s slop appears with a range of 90th to 95th percentile and acceleration/deceleration values of 85th percentile are 0. 60 and 0. 85 m · s-2 Distribution of probability curves of acceleration/deceleration is positively skewed, and drivers＇ preferring values of deceleration and acceleration are 0.17 m · s-2 and 0.25 m · s-2 respectively. Deceleration and acceleration decrease with the increase of curve radius and the decrease of deflection angles, but the increasing/ decreasing trend of continuous curves is weaker than that of independent curves. The critical radius of deceleration based on 85th, 95th and upper bound driver behaviors are 190, 225 m and 275 m respectively and critical radius of acceleration are 204, 245 m and 290 m respectively. Acceleration increases with travel speed dropping and drivers＇ desired speed is 90 km · h-1 for the driving environment analyzed. The scatter distribution of deceleration-initial speed shows isosceles triangles, and the speed corresponding with the vertex of triangle is 63.4 km · h-1.
出处
《中国公路学报》
EI
CAS
CSCD
北大核心
2017年第4期115-126,共12页
China Journal of Highway and Transport
基金
国家自然科学基金项目(51678099
51278514)
交通运输部应用基础研究项目(2015319814050)
重庆市科技计划项目(cstc2014jcyjA30024)
关键词
交通工程
纵向行驶特性
自然驾驶行为
纵向加速度
制动减速度
纵向舒适性
traffic engineering
longitudinal driving behavior
natural driving behavior
longitudinal acceleration
braking deceleration
longitudinal comfort
