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Crushing analysis and multiobjective crashworthiness optimization of combined shrinking circular tubes under impact loading
Structural and Multidisciplinary Optimization ( IF 3.9 ) Pub Date : 2021-05-15 , DOI: 10.1007/s00158-021-02938-8
Weiyuan Guan , Guangjun Gao , Yao Yu

This paper proposes a new type of energy absorber with combined shrinking circular tubes for a high-speed train. An impact experiment is conducted to investigate the dynamic crushing performance of this energy absorber with combined shrinking circular tubes. The results show that the combined tubes experience steady dynamic shrinking deformation. Finite element (FE) models of the energy absorber are then developed, and the dynamic crushing forces are in good agreement with the impact test. A theoretical solution for the dynamic shrinking crushing load is derived. Based on the validated FE models, the effects of the friction coefficient, wall thickness and die radius on the dynamic crushing force and energy absorption are investigated. An increase in the wall thickness leads to a substantial growth in the maximum crushing force (Fmax) and specific energy absorption (SEA), but the growth rate of Fmax is much larger than that of the SEA as the wall thickness increases. In addition, comparing theoretical and FE results demonstrates that predictions of the dynamic steady-state forces for the combined shrinking circular tubes with different friction coefficients, wall thicknesses (t) and die radius (Rdie) are satisfactory. Finally, to improve the crashworthiness of the expanding circular tubes, Sobol’ sensitivity analysis is employed to analyze the effects of the design parameters (t and Rdie) on the objective responses (SEA and Fmax) using the Kriging model. A Pareto front of double optimization objective SEA and Fmax was obtained after being optimized by multiobjective particle swarm optimization (MOPSO). The results show that SEA and Fmax are positively correlated, and a balance between the SEA and Fmax was obtained at optimal point C (SEA = 13.09 kJ/kg, Fmax = 581.11 kN).



中文翻译:

冲击载荷作用下组合式收缩管的破碎分析及多目标耐撞性优化

本文提出了一种用于高速列车的带有组合式收缩圆管的新型能量吸收器。进行了冲击试验,以研究这种带有组合收缩圆管的能量吸收器的动态破碎性能。结果表明,组合管经历了稳定的动态收缩变形。然后开发了能量吸收器的有限元(FE)模型,其动态破碎力与冲击试验非常吻合。推导了动态收缩破碎载荷的理论解。基于已验证的有限元模型,研究了摩擦系数,壁厚和模具半径对动态破碎力和能量吸收的影响。壁厚的增加会导致最大压碎力的大幅增加(F max)和比能量吸收(SEA),但是随着壁厚的增加,F max的增长率远大于SEA的增长率。另外,理论和有限元结果的比较表明,对于具有不同摩擦系数,壁厚(t)和模具半径(R die)的组合收缩圆形管的动态稳态力的预测是令人满意的。最后,为了提高膨胀圆管的耐撞性,采用Sobol敏感性分析来分析设计参数(tR die)对客观响应(S)的影响。EAF max)使用克里金模型。通过多目标粒子群算法(MOPSO)进行优化后,获得了双重优化目标SEAF max的帕累托前沿。结果表明,SEAF max正相关,并且在最佳点C(SEA  = 13.09 kJ / kg,F max  = 581.11 kN)时,SEAF max之间达到平衡。

更新日期:2021-05-15
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