Design optimization of the S-frame to improve crashworthiness
Design optimization of the S-frame to improve crashworthiness
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DOI：
10.1007/s10409-014-0032-y
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发表时间：
2014-05
影响因子：
3.5
通讯作者：
Shutian Liu;Zeqi Tong;Zhiliang Tang;Zonghua Zhang
中科院分区：
文献类型：
--
作者：
Shutian Liu;Zeqi Tong;Zhiliang Tang;Zonghua Zhang
本文对汽车前纵梁结构S形车架进行了耐撞性研究。研究了正多边形、非凸多边形和多单元内加劲肋截面对S形框架能量吸收的影响。通过大量的数值模拟，确定了多室双竖向内加劲肋的S形框架比其他结构能吸收更多的能量。为了提高矩形截面S形框架的吸能性能，还进行了形状优化。采用中心组合试验设计和序贯响应面法构造近似设计子问题，并采用可行方向法求解。在优化结果的基础上，得到了一种新的双S框架。对S形框架的最优结构进行了数值模拟，在挤压过程中观察到了更多的塑性铰和剪切区。与初始构型相比，优化构型的结构吸能效率有所提高。
In this paper, the S-frames, the front side rail structures of automobile, were investigated for crashworthiness. Various cross-sections including regular polygon, non-convex polygon and multi-cell with inner stiffener sections were investigated in terms of energy absorption of S-frames. It was determined through extensive numerical simulation that a multi-cell S-frame with double vertical internal stiffeners can absorb more energy than the other configurations. Shape optimization was also carried out to improve energy absorption of the S-frame with a rectangular section. The center composite design of experiment and the sequential response surface method (SRSM) were adopted to construct the approximate design sub-problem, which was then solved by the feasible direction method. An innovative double S-frame was obtained from the optimal result. The optimum configuration of the S-frame was crushed numerically and more plastic hinges as well as shear zones were observed during the crush process. The energy absorption efficiency of the structure with the optimal configuration was improved compared to the initial configuration.