不均匀积水条件对路面行车安全的影响
发布时间：2018-10-12 14:50
【摘要】：采用Fluent有限元仿真分析软件,建立轮胎-路面-流体三维有限元模型,模拟不同水膜厚度和汽车行驶速度条件下汽车轮胎所受动水压力的理论变化值,定量地分析了水膜厚度和车速对积水路面车辆侧转角的影响以及积水段路面上车辆的横向稳定性能。研究结果表明:当水膜厚度大于胎面花纹深度时,动水压强随车速的增大而增加较快,且动水高压区由轮胎中间向轮胎边缘呈近似三角分布。在无驾驶员操控情况下,当汽车左右轮分别高速(90 km/h)行驶在干燥和积水路面,水膜厚度介于9~12 mm时,1 s后汽车的相对侧转角差超过最佳控制角度(25°),此时汽车操纵性开始下降;2 s后汽车的相对侧转角差已超过90°,车辆发生侧滑,易产生交通事故。
[Abstract]:A three-dimensional finite element model of tire, pavement and fluid is established by using Fluent software. The theoretical variation of dynamic water pressure on tire is simulated under different water film thickness and driving speed. The influence of water film thickness and speed on the lateral turning angle of the vehicle and the lateral stability of the vehicle on the waterlogged pavement are analyzed quantitatively. The results show that when the water film thickness is greater than the tread pattern depth, the hydrodynamic pressure increases rapidly with the increase of the speed, and the hydrodynamic high pressure region shows an approximate triangular distribution from the middle of the tire to the tire edge. In the absence of driver control, when the car's left and right wheels are running at a high speed (90 km/h), respectively, on dry and watery roads, When the thickness of water film is between 9 and 12 mm, the relative lateral angle difference of the vehicle exceeds the optimal control angle (25 掳) after 1 s, and the vehicle maneuverability begins to decrease, and the relative lateral angle difference of the vehicle exceeds 90 掳after 2 seconds, which makes the vehicle slip sideways and cause traffic accidents easily.
【作者单位】： 长安大学特殊地区公路工程教育部重点实验室;
【基金】：交通运输部应用基础研究项目(2014319812170) 教育部高等学校博士学科点专项科研基金项目(20120205120013) 陕西省自然科学基金项目(2012JQ7001) 中央高校基本科研业务费专项资金项目(2013G2211005&CHD2011JC048)
【分类号】：U492.84
，
本文编号：2266539
[Abstract]:A three-dimensional finite element model of tire, pavement and fluid is established by using Fluent software. The theoretical variation of dynamic water pressure on tire is simulated under different water film thickness and driving speed. The influence of water film thickness and speed on the lateral turning angle of the vehicle and the lateral stability of the vehicle on the waterlogged pavement are analyzed quantitatively. The results show that when the water film thickness is greater than the tread pattern depth, the hydrodynamic pressure increases rapidly with the increase of the speed, and the hydrodynamic high pressure region shows an approximate triangular distribution from the middle of the tire to the tire edge. In the absence of driver control, when the car's left and right wheels are running at a high speed (90 km/h), respectively, on dry and watery roads, When the thickness of water film is between 9 and 12 mm, the relative lateral angle difference of the vehicle exceeds the optimal control angle (25 掳) after 1 s, and the vehicle maneuverability begins to decrease, and the relative lateral angle difference of the vehicle exceeds 90 掳after 2 seconds, which makes the vehicle slip sideways and cause traffic accidents easily.
【作者单位】： 长安大学特殊地区公路工程教育部重点实验室;
【基金】：交通运输部应用基础研究项目(2014319812170) 教育部高等学校博士学科点专项科研基金项目(20120205120013) 陕西省自然科学基金项目(2012JQ7001) 中央高校基本科研业务费专项资金项目(2013G2211005&CHD2011JC048)
【分类号】：U492.84
，
本文编号：2266539
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