面向刚度曲线的汽车前保险杠缓冲块优化设计

汽车前端结构刚度的合理设计可以有效改善行人保护性能,以刚度曲线为目标,利用结构优化方法对保险杠缓冲块进行了结构优化设计。对某乘用车前保险杠进行冲击实验,建立前保险杠与刚性柱碰撞的有限元模型,对比仿真和实验得到的刚度曲线,验证了有限元模型的准确性。为了使保险杠区域的刚度曲线达到理想刚度曲线的要求,以缓冲块的材料刚度和几何形状作为设计变量,将保险杠刚度曲线与理想刚度曲线所围成的面积最小化作为目标,采用自适应响应面法进行优化求解。结果表明,优化后的材料刚度和几何形状所对应的保险杠刚度曲线与理想刚度曲线比较接近,能够满足行人保护的要求。

The optimal design of the bumper absorber based on stiffness curve

The reasonable design of the vehicle front-end structure stiffness can effectively improve the performance of pedestrian protection. The optimal design of the bumper absorber was completed by structure optimization, and the stiffness curve was the object. The crash test of the bumper of a passenger car was conducted. Meanwhile the finite element model of the collision between the bumper and rigid pillar was established. The accuracy of the finite element model was verified through comparison between the simulation and test results. In order to make the stiffness curve of the bumper area be close to the ideal stiffness curve, the design variables were the geometric shape and the material stiffness of the absorber. The object was to minimize the area between the ideal stiffness curve and the bumper stiffness curve. Adaptive response surface method was used to optimize the absorber. The result shows that the bumper stiffness curve of the optimized material stiffness and geometric shape is consistent with the ideal stiffness curve and meets the requirement of the pedestrian protection.