侧风对高速汽车行驶稳定性影响的仿真分析

Simulation and analysis on effect of side wind on stabilization of vehicle with high speed

汽车高速运动时的方向稳定性受侧向风的影响非常明显,其影响规律与侧风气动中心的位置密切相关。但是,对侧向风的影响有两种不同的观点,一种观点认为与气动中心和中性转向点的相对位置相关;另一种观点则认为取决于气动中心和质心的相对位置。基于二自由度汽车动力学模型,用Matlab软件对侧风引起的汽车行驶稳定性进行了仿真分析,认为汽车在侧风作用下的运动规律取决于侧风气动中心与中性转向点的相对位置。

The direction stability is obviously affected on side wind when automobile is running at high speed, which is related to the location of aerodynamics center of the side wind. However there are two different standpoints: one is that the direction stability is affected by the relative location between aerodynamics center of the side wind and neutral-steer point; the other is that the effect is related to the relative location between aerodynamics center of the side wind and automotive center of mass. The effect of side wind was simulated with Matlab / Simulink based on two-degree of freedom dynamics model in this research. The result shows the first standpoint is correct.