双车道公路小半径曲线段行车速度与行车轨迹关系研究

Research on the relationships between Driving Speed and Driving Track Path on Small Radius Curves of Two-Lane Highways

为研究双车道公路小半径曲线段中行车速度变化趋势及车速对行车轨迹的影响,建立了某村镇路段双车道公路3处曲线段的三维仿真场景,针对双车道公路运行车速离差大的特点,以小客车不同行车速度进行了驾驶模拟实验.为了保证数据精度,每段曲线提取31个断面.实验表明:车辆在车速较低时能以"减速—稳定—加速"的状态行驶,在车速较高时难以保持此状态;因驾驶员个体差异,曲线段行车轨迹主要分为"漂移"和"校正"两类;行车轨迹向弯道外侧最大偏移位于圆缓点处,向弯道内侧最大偏移位于曲中点处.同时行车轨迹侧向偏移量与行车速度呈正相关关系.

To study the trend of speed changes on small-radius curve segments of two-lane highways and its impacts on driving track path,a 3D model was established to simulate three segments of a given road,and car driving simulations at different speeds were conducted on the principle of large speed deviation on two-lane highways in rural areas. A total of 31 sections per curve segment were selected to ensure the data accuracy. The simulation results indicate： 1） The mode＂slowdown-stability-speedup＂is suitable for vehicle at low speeds,and it is difficulty to keep stable at higher speeds. 2） Due to the individual difference of drivers,the track paths are mainly divided into two types： drifting and correcting. The largest deviation point of the track path at the outer side is the mid-point of the curve to spiral and the mid-point of the curve at the inner side. Meanwhile,there is a positive correlation between the side deviation of driving track path and the driving speed.