Multi-objective optimization of a tapered elliptical tube under oblique impact loading
Multi-objective optimization of a tapered elliptical tube under oblique impact loading
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DOI：
10.1177/0954407017690963
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发表时间：
2017-02
期刊：
影响因子：
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通讯作者：
Q. Gao;Liangmo Wang;Yuanlong Wang;Chenzhi Wang
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文献类型：
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作者：
Q. Gao;Liangmo Wang;Yuanlong Wang;Chenzhi Wang
研究了不同结构形式的薄壁管的耐撞性能。提出了一种新型单胞锥形椭圆管。首先，单细胞锥形椭圆管的耐撞性能进行了比较，受到不同的斜碰撞与其他管与不同的配置（直，锥形，和多细胞锥形）和不同的横截面（方形，矩形，圆形）。通过比较单室锥形椭圆管的比吸能值和最小化峰值压溃力，可以发现单室锥形椭圆管在多个加载角度下具有更好的耐撞性能。其次，为了简化优化过程，采用径向基函数模型结合实验设计方法。第三，采用非支配排序遗传算法Ⅱ确定单室锥形椭圆管的理想径向率f、锥角θ和壁厚t，以最大化比吸能和最小化峰值破碎力为目标。在确定载荷角不确定性的影响时，可以考虑两种不同的加权系数情况（情况1和情况2）。在这两种情况下，优化的单室锥形椭圆管比其他不同截面的管具有更好的耐撞性能。设计对优化结果有很大影响。与原单胞锥形椭圆管相比，优化方案1的复合比吸能指数提高了12.81%，0°处的峰值压溃力降低了16.66%;复合材料在多次斜向载荷作用下的比吸能指数提高了11.8%，0°处的峰值压碎力降低了12.83%。
All types of thin-walled tube with different configurations were studied to determine their crashworthiness performances. A novel single-cell tapered elliptical tube is proposed in this paper. First, the crashworthiness performance of the single-cell tapered elliptical tube subjected to different oblique impacts was compared with those of other tubes with different configurations (straight, tapered, and multi-cell tapered) and different cross-sections (square, rectangular, and circular). It can be found that the single-cell tapered elliptical tube shows a better crashworthiness performance at multiple loading angles by comparing the specific energy absorption values and minimizing the peak crushing force. Second, to simplify the optimization process, the radial basis function model combined with the design-of-experiments method was utilized. Third, to determine the ideal radial rate f, the taper angle θ and the thickness t of the wall of the single-cell tapered elliptical tube, this paper adopted the non-dominated sorting genetic algorithm II to maximize the specific energy absorption and to minimize the peak crushing force. When determining the effect of the uncertainty in the loading angle, two different weighting-factor cases (case 1 and case 2) can be considered. In both cases, the optimized single-cell tapered elliptical tube has a better crashworthiness performance than tubes with other different cross-sections do. The design has a great influence on the optimization results. In comparison with the original single-cell tapered elliptical tube, in case 1, the composite specific energy absorption index under multiple oblique loading of the optimal tube increases by 12.81% and the peak crushing force at 0° decreases by 16.66% and, in case 2, the specific energy absorption index under multiple oblique loading increases by 11.8% and the peak crushing force at 0° decreases by 12.83%.