摘要
为了考察某复杂轨道车辆车体底架中部纵向连杆结构承受纵向压缩载荷的能力,分别将纵向连杆离散成体单元和壳单元,对整车模型进行纵向压缩工况计算,分析2种常规建模方式的计算结果差异和缺陷。为了解决以上2种常规建模方式存在的问题,提出在子模型中对纵向连杆关注区域全部使用体单元建模的方法来得到纵向连杆区域精确的应力结果,并根据精确计算结果对该区域的局部结构进行优化。分析结果表明:在车体结构有限元强度分析过程中,为了解决常规建模方式存在的问题,在合理选择切割边界的情况下,采用子模型技术可以更加快速精确地获得关注区域的应力结果;在车体结构设计中,充分考虑结构刚度的协调性有利于提高车体结构强度。
The longitudinal rod,a key structure in the middle of a complex rail vehicle body＇s underframe,was respectively dispersed into the solid element and shell element in the structure strength analysis for the whole body based on the operation condition of longitudinal compression,as well as the difference and defects of the two conventional modeling methods were indicated.In order to solve the problems of conventional modeling methods,it＇s presented that using solid element to disperse longitudinal rod and its surrounding parts in the sub-model to receive precise result,which was helpful for the structure optimization analysis.The results showed：using sub-model technology,in the proceed of analyzing structure strength of the complex rail vehicle body,could obtain more accurate result efficiently with proper cut-boundary;In the design of body structure,taking more consideration on the coordination of the structure stiffness was beneficial to improve the body structure strength.
出处
《机车电传动》
北大核心
2016年第3期28-32,共5页
Electric Drive for Locomotives
基金
国家国际科技合作专项项目(2013DFA71330)
关键词
轨道车辆
车体结构
有限元法
子模型技术
应力优化
刚度协调
rail vehicle
structure of rail vehicle body
finite element method
sub-model technology
stress optimization
stiffness coordination
