摘要
将原来的汽车前防撞横梁材料替换成超高强度钢后,在确保低速碰撞性能基础上,利用响应面法进行轻量化分析.建立前防撞梁有限元模型,用LS-DYNA进行低速碰撞仿真.在此基础上以横梁和吸能盒的厚度作为变量进行试验设计.构建各项碰撞性能的2阶多项式响应面模型,并验证模型的有效性.以质量和吸能作为优化目标,建立多目标优化模型.与原设计相比,求出的优化方案在保证低速碰撞性能的基础上实现前防撞梁减重36%.
After the original material of automotive front bumper crossbeam is replaced by uhra-high strength steel, the lightweight analysis is performed by response surface method under the condition of ensuring low speed crashworthiness. A finite element model is built for the front bumper beam and the low speed impact simulation is performed by LS-DYNA. The thicknesses of crossbeam and crash box are taken as the variables for design of experiments. The second order polynomial response surface models are built and their effectiveness is verified. Taking the mass and absorbed energy as objectives, a multi- objective optimization model is built. Under the condition of ensuring low speed crashworthiness, the front bumper beam of the optimization scheme is 36% lighter than the original one.
出处
《计算机辅助工程》
2014年第3期16-20,共5页
Computer Aided Engineering
基金
上海市信息委员会专项资金(201201015)
关键词
汽车
低速碰撞
前防撞梁
吸能盒
轻量化设计
响应面模型
多目标优化
automobile
low speed crash
front bumper beam
crash box
lightweight design
response surface model
mufti-objective optimization
