ABSTRACT

The APM 300 running gear structure follows the structural design of the automobile steering drive axle; therefore, the lateral stiffness of the suspension system is considerable, resulting in poor lateral ride comfort. To improve the lateral ride comfort of the vehicle, this paper proposed a new type of running gear called single air spring running gear (SARG), and according to the original loading conditions, the parameters of the SARG air spring are modified. By establishing a theoretical model of linear steady-state curve negotiation of the single-axle tyre running gear, the radial adjusting index is deduced to evaluate the radial performance of the SARG. By establishing the force analysis model of APM rolling in the static state, APM’s flexibility coefficient is obtained to evaluate the anti-overturning capacity. The influence of running gear parameters on the flexibility coefficient is discussed in detail. Based on this, the stiffness of the SARG anti-roll bar is determined. By comparing the dynamic performance of both types of vehicles, the SARG advantages are proved. Finally, several improvements on the SARG structure are proposed for its adaptation to more complex scenario.

摘要

APM 300行走机构结构遵循汽车转向驱动桥的结构设计；因此，悬架系统的横向刚度相当大，导致横向乘坐舒适性较差。为提高车辆的横向平顺性，本文提出了一种新型的行走机构称为单空气弹簧行走机构（SARG），并根据原载荷工况对SARG空气弹簧的参数进行了修改。通过建立单轴轮胎行走机构线性稳态曲线协商的理论模型，推导出径向调整指标来评价SARG的径向性能。通过建立APM在静止状态下滚动受力分析模型，得到APM的柔韧性系数来评价抗倾覆能力。详细讨论了行走机构参数对柔性系数的影响。在此基础上，确定了 SARG 防倾杆的刚度。通过比较两种车辆的动态性能，证明了SARG的优势。最后，提出了对 SARG 结构的一些改进，以适应更复杂的场景。