Abstract: In order to solve the problem of evaluating the limit value of rolover condition caused by vertical excitation of wide-body vehicle, this paper proposed the modified evaluation index of transient lateral acceleration and the modeling method based on conservation of energy for the first time, and solved the problem by coupling the longitudinal and vertical motion modeling of vehicle. The modified transient lateral acceleration spectra under different vehicle speeds and different obstacle heights are obtained by simulink simulation. The experimental results showed that the measured values are in good agreement with the calculated values under limited conditions, thus verifying the effectiveness of the modeling method in this paper.

Key words: wide-body vehicle; rollover threshold; conservation of energy; obstacle; vertical excitation

摘要： 为解决宽体车遇路面障碍物垂向激励引发侧翻工况极限值评估的难题，文章首次提出 修正瞬态侧向加速度评价指标和基于能量守恒的建模方法，并通过车辆纵向和垂向运动建模 耦合求解。通过 Simulink 仿真得到了在不同车速、不同障碍物高度组合输入下的修正瞬态侧 向加速度谱，并试验验证了有限条件下实测值与计算值的吻合度较高，从而验证了文章建模 方法的有效性。

关键词: 宽体车；侧翻阈值；能量守恒；障碍物；垂向激励