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Finite element model updating and structural damage identification using OMAX data

机译:使用OMAX数据进行有限元模型更新和结构损伤识别

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摘要

The main limitations in the finite element (FE) model updating technique lie in the ability of the FE model to represent the true behavior of the structure (modelling problem), and in the ability to identify enough modal parameters with sufficient accuracy, especially for large structures that are tested in operational conditions (identification problem). In this paper, the identification problem is solved with an OMAX approach, where an artificial force is used in operational conditions and a structural model is identified that takes both the forced and the ambient excitation into account. From an extensive case study on a real three-span bridge, it is observed that, while updating the FE model using the experimental output-only data yields a good fit, discrepancies show up when the more extensive set of OMAX data is used for validation, or even for updating. It can be concluded that an OMAX approach not only increases the well-posedness of the updating problem, it also allows to detect potential inaccuracies in the FE model.
机译:有限元(FE)模型更新技术的主要局限性在于FE模型能够表示结构的真实行为(建模问题),以及能够以足够的精度识别足够的模态参数的能力,尤其是对于大型的在操作条件下测试的结构(标识问题)。在本文中,使用OMAX方法解决了识别问题,该方法在操作条件下使用了人工力量,并确定了同时考虑了强制和环境激励的结构模型。通过在真实三跨桥上进行的大量案例研究,可以观察到,尽管使用仅输出实验数据更新FE模型产生了很好的拟合度,但是当使用更广泛的OMAX数据集进行验证时,会出现差异,甚至用于更新。可以得出结论,OMAX方法不仅增加了更新问题的适度性,而且还允许检测FE模型中的潜在误差。

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