扭力梁布置对操稳和舒适性能的影响

为提升扭力梁悬架车型的操稳及舒适性能，以某成熟车型为基础，通过仿真对比分析扭力梁不同布置方案对整车操稳和舒适性能的影响。首先，建立高精度转向、悬架及整车的多体动力学模型，悬架模型的K特性和C特性对标精度达到92.89%和78.30%，整车模型的操稳瞬态角阶跃和稳态回转工况对标精度达到85.19%和98.74%；其次，在主梁截面一定的情况下，基于标定模型对比分析不同方案下的仿真结果，发现操稳性能主要受主梁布置角度影响，舒适性能主要受轮心点与扭力梁安装点间的高度差影响。由研究结果可知，为兼顾扭力梁悬架车型操稳及舒适性能的提升，在扭力梁的设计中首先考虑舒适性能，合理定义安装点与轮心点的高度差，再考虑操稳性能，合理设计主梁的截面形状、开口方向，确保整车的操稳及舒适性能均达到较优水平。

Analysis of the Influence of Twist Beam Arrangement on Ride and Handling Performance

In order to improve the ride and handling performance for newly developed vehicles with twist beam suspension, based on a mature vehicle, we studied the influence of different twist beam arrangements on ride and handling performance by simulation. First, we built high-precision multi-body dynamics models for steering system, suspension system and whole vehicle. Based on K&C and handling test data, the calibration accuracy of K&C characteristics reached about 92.89% and 78.30%, and the calibration accuracy of step steer and constant radius cornering condition reached about 85.19% and 98.74%. Then, comparison simulation experiments for different schemes were carried out and the results show that handling performance is mainly affected by the arrangement of twist beam, and ride performance is mainly affected by the height difference between the wheel center point and mounting point. So, when we design twist beam, we need to consider the influence of difference in height between mounting point and wheel center point on ride performance first, and then we need to consider the influence of main beam's arrangement on handling performance. These ensures that ride and handling performance can reach a high level.