摘要
采用Fluent有限元仿真分析软件，建立轮胎一路面一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（〉90km／h）行驶在干燥和积水路面，水膜厚度介于9—12mm时，1s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；2S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。
Through establishing tire-pavement-fluid 3D finite element model using Fluent FE simulation software, the theoretical values of hydrodynamic pressures that tires suffered under the condition of different water film thicknesses and running speeds are simulated, and the influence of lateral-rotation angle and lateral stability of vehicle running on water surface is quantitatively analysed. The result shows that （ 1 ） when water film thickness exceeds tire tread depth, the growth rate of hydrodynamic pressure intensity that tires suffered increases with increasing of vehicle speed, and hydrodynamic high pressure zone turns to be approximate triangular distribution from the tire center to the tire edge ; （ 1 ） when the driving wheels of vehicle separately move on the dry and water surface （water film thickness is between 9 mm and 12 mm） at high speed （ 〉90 km/h）, the lateral-rotation angle difference of vehicle will exceed the optimal control angle （25 o） when the vehicle is unmanned in 1 s, which descends the handling stability of vehicle, and the lateral-rotation angle difference of vehicle will exceed 90° in 2 s, which causes the car side slipping and occurrence of accident.
出处
《公路交通科技》
CAS
CSCD
北大核心
2014年第10期104-111,共8页
Journal of Highway and Transportation Research and Development
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)
