针对回旋线的使用及其长度是否对弯道上的轨迹特性产生影响的问题,用公路-驾驶员-车辆-环境仿真系统模拟了切弯和跟弯模式下车辆在弯道上的行驶过程,得到了车辆在弯道上的轨迹和速度变化量。分析结果表明:回旋线会改变切弯行驶时车辆轨迹与弯道线形之间的拓扑关系,弯道上的轨迹半径将增大,因此驾驶员可以选择更高的速度驶过弯道,并且回旋线越长这种影响越显著,但这种由回旋线引发的速度增量还依赖于其他3个弯道设计参数,即偏角、路幅宽、半径。
Abstract
Aimed at the problem that whether the use of spirals and their lengths influenced vehicle track characteristic of curves or not,the highway-driver-vehicle-environment simulation system was used to simulate the process of vehicle driving on curves under modes of curve cutting and curve following. The vehicle track and speed were obtained. Analysis result shows that spirals can change the topological relation between vehicle track and curve alignment with curve cutting and increase the radius of track within curve area, and this effect increases with the length of spiral. Therefore, drivers can choose a higher speed to negotiate curves, but not all higher speeds caused by spirals can appear on curves. Occurrence of speed increment also depends on other curve parameters, such as deflection angle, roadway width, and curve radius.
关键词
道路工程 /
路线设计 /
仿真系统模型 /
回旋线 /
轨迹 /
切弯
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Key words
road engineering /
route design /
simulation system model /
spiral /
track /
curve cutting
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中图分类号：
U412.3
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脚注
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基金
四川省科技计划项目(08JC0068);重庆市交通科技项目(2007EA6014)
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