THE USE OF ANTIRESONANCES FOR ROBUST MODEL UPDATING
THE USE OF ANTIRESONANCES FOR ROBUST MODEL UPDATING
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DOI：
10.1006/jsvi.1999.2987
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发表时间：
2000-09
影响因子：
4.7
通讯作者：
W. D’Ambrogio;A. Fregolent
中科院分区：
文献类型：
--
作者：
W. D’Ambrogio;A. Fregolent
在本文中，更新技术，其中包括反共振的输出残差的定义被认为是。反共振不是一个全局的系统属性，但每个频率响应函数（FRF）的典型，从而允许残差向量被扩大从额外的FRF识别的数据。然而，反共振信息并不独立于模态形状信息;相反，它是一种替代方案，出于几个原因，它是优选的。反共振可以从实验频率响应函数中识别出来，其误差比振型小得多;此外，测试和分析反共振之间的相关性是测试和分析频率响应函数之间相关性的一个很好的指标。在该技术的实施中，匹配问题出现时，从转移频率响应函数识别的反共振被使用;与点频率响应函数的情况不同，反共振的分布可能会显着改变的结构模型的微小变化。这些问题可以通过将实验数据库限制为点FRF来规避;在这种情况下，该过程非常稳健，并且获得了优异的结果，尽管有必要计划与通常的模态测试不同的实验测试，可能会对相关成本产生影响。出于这个原因，一个程序来处理转移FRFs通过建立一个测试和分析FRFs之间的相关性，在反共振使用频域保证标准（FDAC），也进行了评估。该程序不是很稳健，需要特别注意才能得到可接受的结果。
In this paper, an updating technique that includes antiresonances in the definition of the output residual is considered. Antiresonances are not a global system property, but are typical of each frequency response function (FRF), thus allowing the residual vector to be enlarged with data identified from additional FRFs. However, antiresonance information is not independent of mode shape information; it is rather an alternative, which is preferable for several reasons. Antiresonances can be identified from experimental FRFs with much less error than mode shapes; furthermore, correlation between test and analysis antiresonances is a good index of the correlation between test and analysis FRFs. In the implementation of the technique, matching problems arise whenever antiresonances identified from transfer FRFs are used; unlike the situation for point FRFs, the distribution of antiresonances may be significantly altered by small changes in the structural model. Such problems may be circumvented by restricting the experimental database to point FRFs; in this case, the procedure is quite robust and excellent results are obtained, although it is necessary to plan experimental testing differently from the usual modal testing, with possible impact on related costs. For this reason, a procedure to deal with transfer FRFs by establishing a correlation between test and analysis FRFs at antiresonances using frequency domain assurance criterion (FDAC), is also evaluated. The procedure is not very robust and requires special attention to give acceptable results.