积水路面轮胎部分滑水数值模拟

为揭示部分滑水状态下轮胎路面作用机理,采用有限元数值模拟方法,分别建立了175-70-R15型轮胎模型和水-空气复合水膜模型,并基于耦合欧拉-拉格朗日法建立了三维充气花纹轮胎滑水数值模型.探讨了水膜厚度和轮胎速度对汽车轮胎受力状态的影响,分析了轮胎所处运动状态对部分滑水过程的影响.计算结果表明:随着水膜厚度的增加,水流竖向托举力增加,纵向附着力减小,轮胎更早地进入完全滑水状态;随着轮胎行驶速度的增加,水流纵向拖拽力大幅增加,同时随着水膜的增厚,这种增加趋势更加明显;回归得到了轮胎受到的水流竖向托举力与水膜厚度和行驶速度的关系式;相比于自由滚动,轮胎处于ABS状态时,更早进入完全滑水状态.

Numerical Simulation of Tire Partial Hydroplaning on Flooded Pavement

To investigate the mechanism of tire-pavement partial hydroplaning, finite element numerical method was applied to establish 175-70-R15 tire model and water-air composite model. Coupled Eulerian-Lagrangian method was applied to establish the three-dimensional numerical model of patterned inflation tire hydroplaning. The simulation investigated the influence of water film thickness and tire velocity on the mechanical responses of tire and discussed the impact of tire motion state on the partial hydroplaning process. The results show that, with the thicker water film, the water lifting force increases, while the longitudinal force provided by pavement decreases, which means that the tire enters into the complete hydroplaning earlier. With the increase of tire velocity, the longitudinal water drag force increases, which occurs more obviously when the water film becomes thicker. The relationship between water lifting force and water film thickness and tire velocity is regressed into an equation. It is determined that tire with ABS enters complete hydroplaning earlier than that in free rolling statement.