摘要
为改善汽车的行人下肢保护性能,提出了一种基于多刚体动力学模型的汽车前端结构刚度设计方法。依据下腿型对保险杠的碰撞试验和汽车前端结构的有限元模型,仿真获得腿部碰撞区域的刚度参数和汽车前端的几何位置参数,在Maydymo中建立了该模型。利用全局响应法(GRSM)进行优化求解。以下肢胫骨加速度、膝部弯曲角度和膝部剪切位移这3个伤害指标归一化后的均方估计(MSE)为优化目标,以保险杠和副保险杠的屈服力和最大变形量为4个设计变量。结果表明:目标函数降低了73.9%,胫骨加速度下降了50.3%,膝部弯曲角下降了48.9%。这说明:对汽车前端结构刚度的优化可以有效提升其行人下肢保护性能。
A design method of vehicle front-end structure stiffness was proposed based on a multi-body dynamics model to improve pedestrian lower leg protection. The model was established in Madymo, based on the crash tests of the leg form impact to car and a FE （finite element） model of the vehicle front-end structure, according to the geometry and stiffness parameters which were obtained by the finite element analysis on the collision area. An optimal design was completed by the global response surface method （GRSM）. The optimal objective was the mean square evaluation （MSE） of normalization of three injury criterion （the tibia peak acceleration, knee bending angle, knee shear displacement） with 4 design variables including the yield forces and the maximum deformations for the bumper and the auxiliary bumper. The results show that the objective reduces by 73.9%, the tibia peak acceleration decrease by 50.3% with the knee bending angle decreasing 48.9%. Therefore, the optimization of the vehicle front-end structure stiffness improves the performance of pedestrian leg protection.
出处
《汽车安全与节能学报》
CAS
CSCD
2015年第2期139-144,共6页
Journal of Automotive Safety and Energy
基金
中央高校基本科研业务费科研专项(CDJZR14115501)
关键词
行人保护
多刚体模型
汽车
刚度设计
优化
pedestrian protection
multi-body model
automobile
design of stiffness
optimization
