摘要
以某中型氢燃料电池货车车架为研究对象,基于变密度法拓扑优化理论,实现了车架静态多工况刚度最大化和提高动态低阶固有频率的目标。保留车架附属连接件,以原车架外廓尺寸建立拓扑优化空间,采用各向同性材料惩罚函数进行多目标拓扑优化,获得最佳的车架结构布局,进行新车架结构设计。结果表明,新车架中部承载能力优于已经通过模态试验验证的原车架,最大应力下降35.6%;第一阶固有频率提高1.9 Hz,能够避开路面激励能量最大的区域;同时车架质量减轻7.8%,实现了氢燃料电池货车车架结构的专用化和轻量化设计。
Taking a hydrogen-fueled truck frame as the research object,based on the topology optimization theory of variable density method,the goal of maximizing the static multi-working stiffness and improving the dynamic low-order natural frequency of the frame is realized.The attachments of the frame were retained,and the topological optimization space was established according to the original frame outline size.A multi-objective topology optimization was carried out by using the isotropic material penalty function to obtain the best frame structure layout,and then the new frame structure was designed.The results show that the middle bearing capacity of the new frame is better than that of the original frame which has been verified by modal testing,and the maximum stress decreases by 35.6%.The first-order natural frequency increases by 1.9 Hz,which can avoid the maximum excitation energy region of the road.Meanwhile,the frame weight is reduced by 7.8%,which realizes the specialized and lightweight design of a hydrogen-fueled truck frame.
作者
李艳星
王铁
吉志勇
李国兴
李渊杰
LI YanXing;WANG Tie;JI ZhiYong;LI GuoXing;LI YuanJie(Department of Vehicle Engineering,Taiyuan University of Technology,Taiyuan 030024,China;School of Mechanical and Electrical Engineering,University of Huddersfield,Huddersfield HD13DH,UK;Shanxi Dayun Automobile Manufacturing Co.,Ltd.,Yuncheng 044000,China)
出处
《机械强度》
CAS
CSCD
北大核心
2022年第5期1128-1133,共6页
Journal of Mechanical Strength
基金
山西省科技重大专项项目(20181102006)资助。
关键词
氢燃料电池货车
车架
变密度法
多目标拓扑优化
Hydrogen-fueled truck
Frame
Variable density method
Multi-objective topology optimization
