An automatic mode pairing strategy using an enhanced modal assurance criterion based on modal strain energies
An automatic mode pairing strategy using an enhanced modal assurance criterion based on modal strain energies
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DOI：
10.1016/j.jsv.2010.07.006
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发表时间：
2010-12-06
影响因子：
4.7
通讯作者：
Bucher, Christian
中科院分区：
文献类型：
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作者：
Brehm, Maik;Zabel, Volkmar;Bucher, Christian
在使用仅输出振动测试数据更新有限元模型的背景下，固有频率和振型被用作验证标准。因此，实验获得的和数值得出的固有频率和振型的正确配对非常重要。在许多情况下，只能获得有限的空间信息，并且测量中存在噪声。因此，自动选择与特定的实验识别的振型相对应的最可能的数值振型可能是一项艰巨的任务。指示相应振型的最常见标准是模态置信度。不幸的是，该准则在某些情况下会失败，并且对于自动方法来说并不可靠。在本文中，纯数学模态置信度将通过来自数值模型的模态应变能方面的附加物理信息来增强。给出了数值示例和实验数据基准研究，以显示所提出的基于能量的准则与传统模态置信准则相比的优势。 (C) 2010 Elsevier Ltd. 保留所有权利。
In the context of finite element model updating using output-only vibration test data, natural frequencies and mode shapes are used as validation criteria. Consequently, the correct pairing of experimentally obtained and numerically derived natural frequencies and mode shapes is important. In many cases, only limited spatial information is available and noise is present in the measurements. Therefore, the automatic selection of the most likely numerical mode shape corresponding to a particular experimentally identified mode shape can be a difficult task. The most common criterion for indicating corresponding mode shapes is the modal assurance criterion. Unfortunately, this criterion fails in certain cases and is not reliable for automatic approaches.In this paper, the purely mathematical modal assurance criterion will be enhanced by additional physical information from the numerical model in terms of modal strain energies. A numerical example and a benchmark study with experimental data are presented to show the advantages of the proposed energy-based criterion in comparison to the traditional modal assurance criterion. (C) 2010 Elsevier Ltd. All rights reserved.