Finite element model updating: Multiple alternatives
Finite element model updating: Multiple alternatives
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DOI：
10.1016/j.engstruct.2008.06.012
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发表时间：
2008-12
影响因子：
5.5
通讯作者：
Boris A. Zárate;J. Caicedo
中科院分区：
文献类型：
--
作者：
Boris A. Zárate;J. Caicedo
本文主要研究复杂结构系统的模型更新问题。传统的模型更新技术通过对目标函数进行优化，计算出一个与实际结构相似的最优模型，并代表结构的物理特性。有人可能会争辩说，由于数值和识别误差，以及结构中传感器的数量有限，局部最小值而不是全局最小值可能更好地表示结构的物理性质。本文提出的方法识别物理上不同的局部最小值，使分析人员能够根据他/她的经验和工程判断来决定哪种模型能更好地描述系统。本文用两个例子来探讨该技术的能力。首先，通过一个简单的数值算例证明了模型更新目标函数中局部极小值的存在性和辨识性。第二个问题确定了Bill Emerson纪念桥有限元模型的模型更新方案。从桥上的永久仪器得到的加速度记录被用来更新模型。
This paper focuses on the model updating of complex structural systems. Traditional model updating techniques optimize an objective function to calculate one single optimal model that behaves similarly to the real structure and represents the physical characteristics of the structure. One can argue that due to numerical and identification errors, and the limited number of sensors in structures, a local minimum rather than the global minimum could be a better representation of the physical properties of the structure. The methodology proposed in this paper identifies physically different local minima, giving the analyst the power to decide what model would better describe the system base on his/her experience and engineering judgment. Two examples are used in the paper to explore the capabilities of the technique. First, a simple numerical example is used to demonstrate the existence and correct identification of local minima in a model updating objective function. The second problem identifies model updating alternatives for a finite element model of the Bill Emerson Memorial Bridge. Acceleration records from the bridge’s permanent instrumentation are used to update the model.