复杂结构有限元建模的验证方法.pdf

文档介绍：复杂结构有限元建模的验证方法
郑立辉李建康宋向荣
江苏大学,工程力学系,镇江,212013
摘要:以发动机曲轴箱为例,给出一种复杂结构有限元模型合理性验证的方法。由 LMS Test. Lab 模态测试系统测得曲轴
箱的固有频率和振型,并对所得的模态参数的有效性进行了验证,再由 LMS Visual. Lab 相关分析模块对试验模态分析所得
模态参数与有限元计算得到的模态参数进行相关性分析,根据相关分析的结果,检验有限元模型的合理性,修改原始有限元
模型,以至得到更加真实可靠的发动机曲轴箱的有限元模型。为基于此有限元模型的动力学优化设计,故障诊断等奠定了基
础。
关键词:LMS; 试验模态分析; 有限元; 发动机曲轴箱; 相关分析
A Method for Validating the Reasonableness of
Complex Construction Finite Element Model
Zheng LiHui Li JianKang Song XiangRong
Department of Engineering Mechanics, Jiangsu University, Zhenjiang, China, 212013
Abstract: Taking the crankcase as an example, a method about validate the reasonableness plex construction was put
forward .The natural frequencies and modes of the crankcase were tested by LMS Test. Lab systems and the reasonableness of those
modal parameters were validated .The correlation between the modal parameters that from testing and finite element analysis is
calculated by LMS Visual. Lab .Using the results of the modal correlation, the finite element model is modified furthermore, in order
to improve the precision of its simulating factual model. The accurate finite element model laid a strong foundation of its
optimization design and fault diagnosis.
Key Words: LMS; experimental modal analysis; finite element; crankcase; correlation analysis

前言
目前用有限元法对所研究的物体的动态特性进行分析是十分有效的,但准确的分析结果需要精确的几
何模型,对与较复杂的结构建立有限