摘要
利用Hypermesh软件对某汽车排气系统模型进行了有限元建模,分析了排气系统的自由模态,得到了系统的固有频率,然后利用平均驱动自由度位移法(average driving degree of freedom displacement,ADDOFD)优化了吊钩位置,使其约束模态下固有频率成功避开了发动机怠速时和经济转速时的激励频率,表明吊钩位置优化合理,最后以通用汽车公司(General Motors,GM)28工况分析了吊钩位置优化后排气系统的强度,最大应力为254.05MPa,远小于材料的强度极限,结果表明此排气系统强度满足要求。
A finite element method （FEM） model was established with the Hypermesh software. To get the natural frequency of the exhaust system, a free modal analysis was carried out. Then, the hangers location was optimized by the average driving degree of freedom displacement method based on the free modal analysis, which made the constraint modal frequencies avoid the engine excitation frequency at idling speed and economic operating area. Finally, the strength of the exhaust system was analyzed based on the GM 28 mode cycles. The results show that the optimized maximum stress is 254.05 MPa, which is significantly less than the strength limit of the material, fully proving the strength of the exhaust system to meet the expectations.
出处
《内燃机工程》
EI
CAS
CSCD
北大核心
2016年第5期199-204,共6页
Chinese Internal Combustion Engine Engineering
关键词
排气系统
平均驱动自由度位移法
吊钩位置优化
模态分析
强度分析
exhaust system l average driving degree of freedom displacement
hanger location optimization
modal analysis
strength analysis
作者简介
何存良（1989-），男，硕士生，主要研究方向为CAD／CAE，E—mail：cunlianghe@163．com。
