A finite element model updating method using experimental modal parameters applied on a railway bridge
A finite element model updating method using experimental modal parameters applied on a railway bridge
复制标题
铁路桥梁试验模态参数有限元模型更新方法
DOI：
10.2495/op010091
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发表时间：
2001
影响因子：
3.4
通讯作者：
G. Roeck
中科院分区：
文献类型：
--
作者：
A. Teughels;J. Maeck;G. Roeck
提出了一种使用实验模态参数的有限元模型更新方法。这样的过程可以被视为一个优化问题。目标函数由实验模态数据（特征频率和振型）与相应的分析预测之间的差异（加权）和组成。该函数可以通过附加正交条件来完成。更新参数是模型的不确定性，在局部改变直到目标函数最小化。基于梯度的算法用于解决优化问题。结果，获得了物理上更正确的模型，可以对其进行进一步的分析。所提出的程序应用于 Xntoing 的一座铁路桥。比利时，已对其进行了动态测量。目标函数的几种变体被最小化并比较结果。
A finite element model updating method using experimental modal para- meters is presented. Such a procedure can be regarded as an optimisation problem. The objective function consists of the (weighted) sum of differ- ences between the experimental modal data (eigenfrequencies and mode- shapes) and the corresponding analytical predictions. The function can be completed with additional orthogonality conditions. The updating para- meters are the uncertainties of the model, which are changed locally until the objective function is minimised. A gradient-based algorithm is used to solve the optimisation problem. As a result a physically more correct model is obtained on which further analysis can be made. The presented proce- dure is applied on a railway bridge at Xntoing. Belgium, on which dynamic measurements have been made. Several variants of objective functions are minimised and the results are compared.