一体化单纵臂式轮边电驱动系统垂纵动力学耦合研究

Coupling Research on Vertical and Longitudinal Dynamics of A Trailing Arm Suspension Integrated Electric Drive System

为研究一体化单纵臂式轮边电驱动系统垂纵动力学耦合特性,结合具体的悬架形式建立了1/4车辆动力学模型,并推导出其动力学方程。仿真计算表明电机输出阶跃转矩时,纵向驱动力对系统垂向运动产生影响,恶化了其垂向性能。为减轻纵向驱动力对垂向性能的不良影响,以车身垂向加速度均方根、悬架动挠度均方根和车轮相对动载荷均方根为评价指标,设计了正交试验。试验研究了悬架结构参数对评价指标的影响,找出了显著因素,得到了基于仿真试验结果的最优方案,并验证了最优方案能有效减轻纵向驱动力对垂向性能的不良影响。

In order to research on the coupling between vertical and longitudinal dynamics of a trailing arm sus- pension integrated electric drive system, a quarter car model was proposed and dynamic equations were derived. Given a step torque outputted by motor, the simulation showed that vertical motion of the system was excited by longitudinal force, furtherly, the vertical performance was deteriorated. In order to inhibit the deterioration of vertical performance resulted from the coupling, root mean square values of the body vertical acceleration, suspension working stroke and dy- namic tireload were selected as evaluation indices. The orthogonal experiment was designed to investigate the influence of the specific suspension parameters on evaluation indices. Then the important factors were concluded. The optimum combination was obtained and its effectiveness of inhibiting the deterioration of vertical performance was proved.