货车后下部防护装置碰撞仿真及优化设计

Study on Crash Simulation and Structure Optimization of the Rear Bumper of a Truck

针对目前货车后下部防护装置难以保证防止钻撞功能的问题,对后下部防护装置进行优化设计。依据GB 11567.2—2001对汽车后下部防护装置的要求,利用LS-DYNA仿真软件对优化后的后下部防护装置进行碰撞仿真对比分析。通过动态仿真优化前后的后下部防护装置在碰撞过程中的变形、碰撞速度、碰撞减速度以及吸能情况,证明优化后的后下部防护装置在各项性能上都得到了提高,在发生后车追尾碰撞的时候,既能缓冲瞬时冲击,又能有效阻挡后车钻入,避免恶性事故发生。

To solve the problem on rear bumper of a truck which has no functions of blockage and damping and energy absorption , rear bumper is optimized and simulative analysis and validation are carried out with LS -DYNA in accordance with related regulation of GB 11567.2-2001 concerning rear bumper .The simulation analysis of deformation velocity and deceleration show that the optimized design of the rear bumper after the performance has been optimized , can weaken the instantaneous impact , and avoid the rear car to im-pact the truck .