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Journal of Central South University

, Volume 26, Issue 10, pp 2729–2745 | Cite as

Crashworthiness optimization design of foam-filled tapered decagonal structures subjected to axial and oblique impacts

  • Sadjad PirmohammadEmail author
  • Soheil Ahmadi-Saravani
  • Javid Zakavi S.
Article
  • 11 Downloads

Abstract

In this research, crashworthiness of polyurethane foam-filled tapered decagonal structures with different ratios of a/b=0, 0.25, 0.5, 0.75 and 1 was evaluated under axial and oblique impacts. These new designed structures contained inner and outer tapered tubes, and four stiffening plates connected them together. The parameter a/b corresponds to the inner tube side length to the outer tube one. In addition, the space between the inner and outer tubes was filled with polyurethane foam. After validating the finite element model generated in LS-DYNA using the results of experimental tests, crashworthiness indicators of SEA (specific energy absorption) and Fmax (peak crushing force) were obtained for the studied structures. Based on the TOPSIS calculations, the semi-foam filled decagonal structure with the ratio of a/b=0.5 demonstrated the best crashworthiness capability among the studied ratios of a/b. Finally, optimum thicknesses (t1 (thickness of the outer tube), t2 (thickness of the inner tube), t3 (thickness of the stiffening plates)) of the selected decagonal structure were obtained by adopting RBF (radial basis function) neural network and genetic algorithm.

Key words

crashworthiness foam-filled tapered structure axial and oblique impact RBF neural network and genetic algorithm TOPSIS technique 

泡沫填充锥形十面体结构在轴向和斜向冲击下的耐撞性优化设计

摘要

本研究评估了a/b=0, 0.25,0.5,0.75 和1 的聚氨酯泡沫填充锥形十面体结构在轴向和斜向冲 击下的耐撞性。这些新设计的结构包括内部和外部锥形管和四个加强板将它们连接在一起。参数a/b对应于内胎侧长到外胎侧长。此外,内外管之间的空间填充了聚氨酯泡沫。利用试验结果对LS-DYNA 产生的有限元模型进行了验证,得到了研究结构的SEA(吸收能比)和Fmax(峰值破碎力)的耐撞性指标。 根据TOPSIS 的计算,a/b=0.5 的半泡沫填充十面体结构表现出最佳的耐撞性能。最后,采用径向基函 数神经网络和遗传算法分别得到所选十面体结构的最佳厚度(外管厚度t1、内管厚度t2、加强板厚度t3)。

关键词

防撞性 回手锥形结构 轴向和斜向碰撞 RBF 神经网络与遗传算法 TOPSIS 法 

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Notes

Acknowledgements

This research project has been financially supported by the Office of Vice Chancellor for Research under a research grant of Project No.: 1365-96/7/22 from University of Mohaghegh Ardabili. This support is gratefully acknowledged.

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Copyright information

© Central South University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Sadjad Pirmohammad
    • 1
    Email author
  • Soheil Ahmadi-Saravani
    • 1
  • Javid Zakavi S.
    • 1
  1. 1.Department of Mechanical EngineeringUniversity of Mohaghegh ArdabiliArdabilIran

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