铝合金抗凹支架行人保护性能研究

Investigation on Pedestrian Protection Performance of Aluminum Alloy Anti-concave Bracket

抗凹支架是发动机罩锁扣区域行人头部碰撞的重要吸能部件,对铝合金抗凹支架结构的行人保护性能进行了研究。建立有限元分析模型并对碰撞过程进行仿真模拟,结果表明抗凹支架区域头部伤害值较大,碰撞初始头部加速度偏低,后期头部触底。利用简化模型对头部受力进行分析,通过调整材料密度进行仿真,研究随动质量抵抗力对头部加速度的影响。结合分析提出有利于行人保护的连续式抗凹支架形式。

The anti-concave bracket is an important energy-absorbing structure of the pedestrian head collision. The pedestrian protection performance of aluminum alloy bracket was researched. Finite element model was established and the collision was simulated. Result shows that the head injury value is high;in the early stage during the collision, the acceleration value is low, and in the later stage head touches the bottom. The force acting on the head was conducted by a simplified model. The influence of the follow-up mass was studied through changing the hood density. Based on the analysis, a revised bracket was proposed.