中文摘要：

为了增强某款SUV车的耐撞性,提出了一种带诱导槽的八边形结构、可逐级吸收碰撞能量的前纵梁,并建立了其准静态纵向压溃和台车碰撞两种有限元模型。在台车模型中考虑了台车质心位置和车轮模型的刚度、高速旋转与摩擦特性的影响;采用正交试验设计法对前纵梁的材料、壁厚和焊点位置进行了优化,并将优化结果用于底盘结构。底盘耐撞性试验结果表明,优化后结构具有较好的吸能能力。

英文摘要：

For enhancing the crashworthiness of a production SUV,a stepwise energy-absorbing structure of front side rail with an octagonal cross-section and deformation-inducing grooves is proposed,and two FE models are created respectively for its quasi-static longitudinal crush and sled crash.In sled model the effects of the mass center position of sled,as well as the stiffness,high-speed rotation and friction characteristics of tires are taken into consideration.By using orthogonal experimental design method,an optimization on the material,thickness and spot weld positions of front side rail is conducted with its outcome applied to chassis structure.The results of chassis crashworthiness test show that the structure optimized has better energy-absorbing ability.