中型载货车车身扭转刚度对车辆侧翻特性的影响

Influence of Vehicle Body Torsional Stiffness On Vehicle Roll Characteristics of Medium Duty Truks

因为较小的轮距和车辆质心高度的比值,较长的轴距和较大的惯性距,控制货车车辆侧翻操纵稳定性是最重要的特性。而较长的轴距,造成车身扭转刚度降低。因此,要研究其对车辆侧翻特性的影响。我们进行了对中型载货汽车的仿真分析和试验,用改变车辆参数研究车辆的频率响应特性。结果表明,车身扭转刚度降低,增大前倾角的稳态增量,不影响车辆运动的侧滑和侧翻特性。因此,即使车身扭转刚度不可避免地较低,采用增大前悬架的侧倾刚度,减小前倾角,可保持合适的车辆操纵稳定性。

Because of smaller ratios of tread to height of gravitational center,longer wheel-bases,and larger moment of inertia,vehicle roll is the most important characteristics governing truck controllability and stability.And longer wheel-bases result in a reduction in vehicle body torsional stiffness.Hence,the influence of vehicle body torsional stiffness on vehicle roll characteristics is investigated.We carried out a simulation analysis and vehicle test on mediumduty trucks,in studying the vehicle frequency response characteristics by changing vehicle design parameters.The results show that a reduction in body torsional stiffness increases the steady state gain of the front roll angle without affecting the yaw and lateral characteristics of vehicle motion.Accordingly,even if body torsional stiffness is unavoidably lowered,reducing the front roll angle by increasing the roll stiffness of the front suspension can maintain appropriate vehicle controllability and stability.