摘要
基于Hypermesh软件建立的汽车排气系统的有限元模型,运用MSC.NASTRAN软件首先进行自由模态分析,初步确定悬挂点位置。再运用平均驱动自由度位移法(ADDOFD)对排气系统的悬挂点位置进行优化。最后对优化后的排气系统进行了约束模态分析。结果表明,优化后的各阶固有频率能避开发动机怠速和经济转速下的激励频率,从而可以有效降低排气系统的振动。
Based on the finite element model of an automobile exhaust system which was established by Hypermesh,the free modal analysis was first carried out by MSC.NASTRAN to determine the initial hanger locations.Based on the con⁃straint modal analysis,the optimization of hanger locations was presented through the average driving degrees of freedom displacement(ADDOFD).It shows that for the optimized hanger locations,the natural frequencies of exhaust system can avoid excitation frequency from engine when it operates at both idle and economic rotation speed.
作者
舒月
单宝来
李欣业
李煜彤
SHU Yue;SHAN Baolai;LI Xinye;LI Yutong(School of Mechanical Engineering,Hebei University of Technology,Tianjin 300130,China;Fengnan Vocational and Technical Education Center,Tangshan,Hebei 063300,China;School of Mechanical Engineering,Tianjin University,Tianjin 300072,China)
出处
《河北工业大学学报》
CAS
2021年第3期25-30,共6页
Journal of Hebei University of Technology
基金
国家自然科学基金青年科学基金(51705128)。
关键词
汽车排气系统
悬挂位置优化
自由模态
约束模态
有限元模型
automotive exhaust system
optimization of hanger location
free modes
constrained modes
finite element model
