Multiobjective optimization of multi-cell sections for the crashworthiness design
Multiobjective optimization of multi-cell sections for the crashworthiness design
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DOI：
10.1016/j.ijimpeng.2007.09.003
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发表时间：
2008-11
影响因子：
5.1
通讯作者：
Shujuan Hou;Qing Li;S. Long;Xujing Yang;Wei Li
中科院分区：
文献类型：
--
作者：
Shujuan Hou;Qing Li;S. Long;Xujing Yang;Wei Li
当冲击发生时，结构的塑性变形吸收大量的动能。为此，能量吸收部件已被广泛用于车辆的结构设计中，以有意地吸收大部分碰撞能量以减少乘员的严重伤害。另一方面，高峰挤压力可能在一定程度上表明结构完整性和乘员生物力学损伤的风险。因此，寻求这些部件的优化设计，使其能量吸收最大化，峰值力最小化，具有重要意义。本文的目的是设计多室截面薄壁柱这两个耐撞性准则。一个显式的有限元分析（FEA）是用来获得高阶响应面这两个目标。分别对单、双、三、四单元截面柱在纵向冲击载荷作用下进行了单目标和多目标优化。通过比较分析，探讨了这两种设计准则与不同优化公式之间的关系。
Plastic deformation of structures absorbs substantial kinetic energy when impact occurs. For this reason, energy-absorbing components have been extensively used in the structural design of vehicles to intentionally absorb a large portion of crash energy to reduce the severe injury of occupants. On the other hand, high peak crushing force may to a certain extent indicate the risk of structural integrity and biomechanical damage of occupants. For this reason, it is of great significance to maximize the energy absorption and minimize the peak force by seeking for optimal design of these components. This paper aims to design the multi-cell cross-sectional thin-walled columns with these two crashworthiness criteria. An explicit finite element analysis (FEA) is used to derive higher-order response surfaces for these two objectives. Both the single-objective and multi-objective optimizations are performed for the single, double, triple and quadruple cell sectional columns under longitudinal impact loading. A comparative analysis is consequently given to explore the relationship between these two design criteria with the different optimization formulations.