塑料进气歧管结构性能的仿真分析方法  

Structural Performance Analysis of Plastic Intake Manifold based on Numerical Simulation Method

作　　者：任正芳[1] 李恒 REN Zheng-fang;LI Heng(Great Wall Motor Co.,Ltd.,Baoding 071000,China;Datro Auto Technology Co.,Ltd.,Shanghai 201804,China)

机构地区：[1]长城汽车股份有限公司,保定071000 [2]上海大创汽车技术有限公司,上海201804

出　　处：《内燃机与配件》2018年第19期20-23,共4页Internal Combustion Engine & Parts

摘　　要：基于FEM数值方法研究了塑料进气歧管的结构性能,结合工程开发,重点开展了模态、爆破分析等工作。首先,采用FEM方法分析了塑料歧管的自由模态,并与力锤敲击法实验结果相对比,验证结构模型、材料物性参数以及各部件连接方式等的准确性。其次,模拟实际整车固定安装方式,分析了塑料进气歧管的约束模态,以及爆破条件下塑料进气歧管结构的应力分布情况。最后,基于约束模态、爆破分析结果,对歧管结构、局部焊接区域及安装支架进行优化设计,优化后的歧管一阶模态频率提高至207Hz,上片体焊接部位的应力值降低至55.7 MPa,且歧管本体的变形量均得到较大幅度的降低,优化效果显著,满足工程设计目标。To thoroughly investigate the structural characteristics of plastic air intake manifold(AIM),the FEM numerical approach was employed during the modal analysis and burst analysis.First,the free modes were calculated through FEM and the result was validated by experimental data,which indicates that the structural model,material parameters and the connecting setup between each component are suitable and exact enough in simulation.Then,according to the engineering application,the working constraint modes were simulated as well as the stress distribution of such plastic AIM.Finally,the structural optimization was preceded based on the mode and stress results.Specifically the AIM body,certain local welding area and the mounting bracket were modified and restructured by CAE tools.The optimized 1st mode frequency is shifted to 207 Hz,the maximum stress result of AIM is reduced to 55.7 MPa,and the strain result is becoming better as well.In conclusion,the FEM analysis is proved accurate enough in structural analysis,and the optimization performance is obviously excellent meeting the real demands and being the guidance of engineering design.

关 键 词：塑料进气歧管 模态分析 爆破分析 数值仿真 

分 类 号：U464.134.4[机械工程—车辆工程]