Multiobjective crashworthiness optimization of functionally lateral graded foam-filled tubes
Multiobjective crashworthiness optimization of functionally lateral graded foam-filled tubes
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DOI：
10.1016/j.matdes.2012.08.033
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发表时间：
2013-02
影响因子：
8.4
通讯作者：
H. Yin;G. Wen;Shujuan Hou;Qixiang Qing
中科院分区：
文献类型：
--
作者：
H. Yin;G. Wen;Shujuan Hou;Qixiang Qing
泡沫填充管最近由于其优异的能量吸收能力而受到关注。为了提高泡沫填充管的耐撞性，研究了两种横向梯度泡沫填充管的吸能特性。结果表明，两种FLGFT均比相同重量的普通均匀泡沫填充管（UFT）具有更好的能量吸收能力。此外，还发现控制泡沫密度变化的梯度指数参数m对FLGFT的耐撞性有显著影响。为此，采用多目标粒子群优化算法（MOPSO）对两种FLGFT进行优化，以获得最大的比能量吸收（SEA）和最小的峰值破碎力（PCF），寻求最优的梯度指数参数。在多目标优化设计过程中，建立了SEA和PCF的七次多项式函数，并发现其精度足以满足工程设计要求。优化结果进一步表明，优化后的FLGFT比普通UFT具有更好的吸能特性。优化设计数据对FLGFT的耐撞性设计具有很好的指导意义。
Foam-filled tubes have recently gained attention due to their excellent energy absorption capacity. In order to improve the crashworthiness of foam-filled tubes, the energy absorption characteristics of two kinds of functionally lateral graded foam-filled tubes (FLGFTs) are investigated in this paper. Based on the numerical results, it is found that each of the two kinds of FLGFTs has more excellent energy absorption capacity than the ordinary uniform foam-filled tube (UFT) with the same weight. In addition, it can also be found that the gradient exponential parameter m which controls the variation of foam density gives rise to significant effects on the crashworthiness of FLGFTs. Thus, in order to seek for the optimal gradient exponential parameter, the two kinds of FLGFTs are optimized by multiobjective particle swarm optimization (MOPSO) algorithm, aiming to achieve the maximum specific energy absorption (SEA) and the minimum peak crushing force (PCF). During the process of multiobjective optimization design, the 7th-order polynomial functions of SEA and PCF are established and found to be accurate enough for engineering design. The results obtained by optimizations further indicate that the optimal FLGFT performs more excellent energy absorption characteristics than ordinary UFT. The optimization design data is a good guidance for the crashworthiness design of FLGFTs.