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为改善高速客车的路面不平度稳定性,研究了高速客车路面不平度干扰转向的机理及其影响因素。首先建立反映客车高速行驶时受到不平路面干扰产生转向运动的动力学模型,并推导出其状态方程。然后就前轴静态负荷、轮胎侧偏刚度、转向系统阻尼、前轮定位回正力矩等主要影响因素进行变参数动态仿真及单因素影响分析,得出增大前轴静态负荷、前轮定位回正力矩及减小转向系统阻尼是减小高速客车前端最大偏移量较为可行的措施。最后通过实车试验对采取改进措施后的效果进行了验证,结果显示关于该客车路面不平度稳定性的仿真结果与试验结果基本吻合。上述研究结果可为改善高速客车产品的路面不平度稳定性提供理论参考。
In order to improve the stability of the road surface roughness of high-speed passenger car, the mechanism and influencing factors of high-speed passenger car road surface irregularity interference steering are studied. Firstly, a dynamic model is established to reflect the steering motion caused by the uneven road surface during the high-speed running of the bus, and the equation of state is derived. Then dynamic analysis of the main influencing factors such as the static load on the front axle, the lateral stiffness of the steering wheel, the damping of the steering system and the back-turning torque of the front wheel are carried out. Positive torque and reduce the damping of the steering system is to reduce the maximum offset front-end high-speed bus more feasible measures. Finally, the actual vehicle test is taken to verify the effect of the improvement measures. The simulation results show that the simulation results of the road surface roughness are in good agreement with the test results. The above results can provide a theoretical reference for improving the road surface roughness of high-speed passenger car products.