汽车多刚体操纵稳定性模型及稳定性分析

Automobile rigid multi-body handling stability model and its stability analysis

运用多刚体动力学罗伯森-维登堡法充分考虑悬架系统的作用,建立了两轴汽车六自由度操纵稳定性模型.在此基础上,运用Hurwitz定理分析汽车的操纵稳定性,得出汽车具有稳定行驶性能的两个必要条件:汽车后悬架弹簧有效距离的平方与后悬架单侧弹簧刚度乘积大于前悬架弹簧有效距离的平方与前悬架单侧弹簧刚度乘积;汽车后轴所载质量与前轮胎侧偏刚度的乘积大于前轴所载质量与后轮胎侧偏刚度的乘积.

A new 6DOF （six degree of freedom） two-axle automobile multi-body handling stability model was developed by the Roberson-Wittenburg method. In the model, a suspension system was taken into account. On this base, automobile handling stability was analyzed further by the Hurwitz theorem. The results show that an automobile with nice stable ride performance should follow two necessary conditions： the product of the square of rear bearing spring effective range and the rear suspension single side spring constant should be more than that of the square of front bearing spring effective range and the front suspension single side spring constant; the product of the mass hold by rear axle and the front tyre lateral stiffness should be more than the product of the mass hold by front axle and the rear tyre lateral stiffness. The second condition complements the deduced condition from a classic 2DOF automobile handling stability model.