For the situation of significantly different results of frontal impact tests of the same vehicle model with one luxurious car and one basal car, by applying the finite element simulation technology, crash performance was mapped after time decomposition, space decomposition and crash force decomposition. The dynamic analysis of the sub-system consisting of rear suspension assembly was carried out for the causation. The results show that for the vehicle model of front-mounted engine, rear-mounted drive, chassis has an important contribution of collision force transmission. The multi-link rear suspension of the luxurious car has a greater longitudinal stiffness than leaf spring rear suspension of the basal car, which causes a higher acceleration markedly. The corresponding solution is educed after the analysis.

针对同一车型的高配车与低配车正碰法规试验结果差异明显的情况，应用有限元仿真技术，进行了时间分解、空间分解、碰撞力分解，绘制了正碰耐撞性能图谱，对造成试验结果差异的后悬总成进行子系统动态分析，研究结果表明，发动机前置后驱式车辆的底盘传力对正碰有重要影响，五杆螺旋弹簧式后悬比钢板弹簧式后悬纵向刚度更大，导致第二时间段内高配车车身加速度明显高于低配车，在此基础上提出了相应的解决方案。

正碰, 车身加速度, 碰撞性能图谱, 后悬