摘要
有限元模型的修正对机械结构的动态特性进行准确而可靠的预测是很重要的。利用试验测试和预测的有限元模型计算得到的频响函数 (FRF) ,引入两种频响函数相关性的判定标准 ,提出基于频响相关函数的灵敏度分析的修正方程。数值实例研究结果表明 ,该方法利用少量的测量数据 ,即使测试数据含附加噪声 ,也可在很宽的频率范围内得到接近真实结构的有限元模型修正解。本文的方法可适用于大型复杂结构的模型修正。
Finite element (FE) model updating is an important tool to improve the accuracy of an initial FE model so that the predicted dynamic behavior matches as closely as possible that observed during the experiment. Two frequency response function (FRF) correlation functions are introduced, and an updating algorithm has been devised using the sensitivity of FRF correlation functions with respect to the selected design parameters. Numerical results indicate that this method can be defined for any number of FRFs and updating frequency range, and is robust against measurement noise. This method can also be provided to update large damping complex structures.
出处
《机械强度》
CAS
CSCD
北大核心
2003年第1期5-8,共4页
Journal of Mechanical Strength
关键词
模型修正
频响函数
相关性
灵敏度
有限元
Model updating
Frequency response function
Correction
Sensitivity
Finite element method
