摘要
为研究三节直翻卷圆管轴向压缩下的吸能特性,采用非线性有限元软件LS-DYNA进行了仿真分析,发现当上圆管、下圆管壁厚越接近且上圆管厚度略大于下圆管时,载荷-位移曲线统一于一条平稳的水平线,圧缩力效率乘积可达0.838 7,比吸能可达15.342 8 J/g,冲程效率高达76%,接近理论值。针对三节直翻卷圆管冲程效率高、载荷十分平稳但比吸能欠缺的特点,在其内部填充波纹管和多胞管以提高总吸能及比吸能。结果表明:填充后形成的组合吸能装置延续了冲程效率高、载荷平稳的特性,相比单一直翻卷管,总吸能提高了105.75%,比吸能提高了26.28%。利用径向基函数代理模型及遗传算法对组合吸能装置的比吸能进行寻优,优化结果显示,最大比吸能在多胞管、波纹管壁厚分别取上限值、下限值时达到,且相比单一直翻卷管,其值提高了30.86%。
To study the energy absorption characteristics of the threesection straightturned tubes under axial compression,the nonlinear finite element software LSDYNA was used for simulation and analysis.It is found that the forcedisplacement curve is unified in a very stable horizontal line when the thickness of the upper tube is slightly larger than that of the lower tube,with the product of compression force efficiency up to 0.838 7,SEA equals to 15.342 8 J/g and the stroke efficiency up to 76%,which are close to the theoretical values respectively.Due to the characteristics of high stroke efficiency,smooth forcedisplacement curve but deficient in SEA,bellows and multicellular tube were filled inside the threesection straightturn tubes to improve the SEA,whose results show that the combined energy absorption device maintains the characteristics of high stroke efficiency and stable load,while creating an increase by 105.75%in total energy absorption and 26.28%in SEA,comparing with the single threesection straightturn tubes.Then the radial basis function proxy model and the genetic algorithm were applied to optimize the SEA of the combined energy absorbing devices.Optimization results show that the maximum SEA is obtained with the multicellular tube,bellows taking the upper limit and lower limit of thickness individually;the value increases by 30.86%,comparing with the single threesection straightturn tubes.
作者
刘彬
肖守讷
朱涛
阳光武
车全伟
LIU Bin;XIAO Shoune;ZHU Tao;YANG Guangwu;CHE Quanwei(State Key Laboratory of Traction Power,Southwest Jiaotong University,Chengdu,610031;CRRC Qingdao Sifang Co.,Ltd.,Qingdao,Shandong,266111)
出处
《中国机械工程》
EI
CAS
CSCD
北大核心
2018年第17期2052-2059,共8页
China Mechanical Engineering
基金
国家重点研发计划资助项目(2016YFB1200505)
关键词
三节直翻卷管
组合吸能装置
圧缩力效率
冲程效率
比吸能
three-section straight.turn tube
combined energy absorbing device
compression force efficiency
stroke efficiency
specific energy absorption(SEA)
