摘要
由于有限元模型与实验模型自由度的不匹配,模型修正中经常需要使用模态扩展技术。利用动态扩充法进行模态扩展进而进行模型修正时,模型修正过程中并没有考虑到使用有限元模型对实验数据进行模态扩展而造成的误差。针对这一问题,提出一种新的迭代方法,在模型修正过程中计及了上述的误差项,并将其以修正项的形式添加到模型修正当中,同时该方法没有限定所使用模型修正的方法,具有一定的通用性。通过Cross-model Cross-mode method(CM-CM)模型修正方法对新的迭代方法进行了详细讨论。算例表明,新的迭代方法较原方法可以极大地提高模型修正的迭代收敛速度。
Model updating usually uses modal expansion technology for the incompatibility of the degrees of freedom between finite element(FE) model and experimental model.In the use of dynamic expansion method to expand the test data and then update the FE model,the model updating process does not take account of the error induced by expanding the test data with the FE model.In order to solve this problem,the paper proposes a new iterative strategy that in the process of model updating,the above-mentioned error was considered and the disadvantageous effect was elimilated by adding a correction term to the model updating formula.Furthermore,the method has universal significance because it does not limit the kind of model updating method.To illustrate the validity of the proposed method,cross-model cross-mode(CMCM) model updating method was used.Numerical example shows that the new method can greatly improve the convergence velocity of iteration.
出处
《振动与冲击》
EI
CSCD
北大核心
2010年第6期4-7,共4页
Journal of Vibration and Shock
基金
国家自然科学基金(10772113)资助项目
关键词
有限元
模型修正
模态扩展
迭代
finite element
model updating
modal expansion
iteration
