摘要
为了提高圆截面金属薄壁构件的抗撞性,在其上引入圆弧形凹、凸2种诱导槽结构并以其为研究对象。建立以诱导槽数量及其半径为优化参数,以比吸能(SEA)和压溃力效率(CFE)为评价指标的多目标优化数学模型。讨论了均布设置的诱导凹槽、凸槽对结构吸能、最大峰值压溃力及压溃力曲线平稳性的影响。采用全因子试验设计选取设计样本点,通过有限元软件LS-DYNA得到不同样本点的碰撞响应,结合径向基函数法构造优化指标的近似函数,并采用理想点法进行优化设计。研究结果表明:优化后凹、凸2种诱导槽结构与原模型相比,压溃力效率分别提高了53.22%、102.15%,最大峰值压溃力各降低了52.1%、57.49%,压溃力曲线更趋于平稳;由于施加诱导槽造成结构整体质量增加,导致优化后凹、凸2种诱导槽结构的比吸能分别比原模型各减少了4.05%、7.99%,与大幅降低的最大峰值压溃力相比,很好地达到了提高抗撞性的目标。
In order to improve crashworthiness of circular cross-section of thin-walled metal component, this paper took thin-walled metal cylindrical tubes as research objects on the basis of inducing indentations and convex grooves. The multi-objective optimization mathematical model was built by taking the specific energy absorption and the crush force efficiency as evaluation indexes, and numbers and radius of the inducing grooves were chosen as optimization parameters. The energy absorption, the maximization peak force and the smoothness of crush force curves were analyzed. The sample points were selected by full factorial experimental design, and collision response of the sample points were got through finite element software LS-DYNA, objective functions were constructed based on the radial basis function （RBF）, and multi objective optimization for thin-walled metal component with the inducing indentations and convex grooves was presented by using the ideal point method. The results show that compared with the original model, crushing force efficiency of the structure of two kinds of inducing grooves increase separately by 53.22%, and 102.15%, and the maximum peak crushing force reduced by 52.1%, and 57.49 %. The crush force curve tends to be more smoother. Due to the increasing quality of induced structure, the specific energy absorption decrease by 4.05 %, 7.99%. Compared with the greatly reduced maximum peak crush force, it can achieve the aim of improving crashworthiness. 3 tabs, 9 figs, 16 refs.
出处
《长安大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2016年第1期120-126,共7页
Journal of Chang’an University(Natural Science Edition)
基金
国家自然科学基金项目(50975121)
吉林省科技发展计划项目(201101030)
一汽集团科技创新项目(1332)
关键词
汽车工程
优化设计
比吸能
压溃力效率
诱导槽
薄壁构件
automobile engineering
optimization design
specific energy absorption （SEA）
crush force efficiency （CFE）
inducing groove
thin-walled component
