DETECTION OF STRUCTURAL FAULTS BY MODAL DATA, LOWER BOUNDS AND SHADOW SITES
DETECTION OF STRUCTURAL FAULTS BY MODAL DATA, LOWER BOUNDS AND SHADOW SITES
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通过模态数据、下限和影子位点检测结构故障
DOI：
10.1006/jsvi.1997.1303
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发表时间：
1998
影响因子：
4.7
通讯作者：
A. Messina
中科院分区：
文献类型：
--
作者：
T. Contursi;L. Mangialardi;A. Messina
摘要利用模态数据（如固有频率和振型）对土木和机械结构进行诊断，近来已发展出不同的算法。虽然已经提出了许多解决方案，但在技术文献中似乎缺少一些重要的问题。如果结构的模态参数的变化能够反映结构故障，那么知道该结构中最小的可检测物理变化是很重要的。建议通过模态数据的损伤检测可以是有用的宏观损伤，而不是微观损伤。这导致从数值和实验测试使用一个简单的相关性测量噪声和灵敏度的模态数据，相对于系统的不同部分的结构变化。提出了一种自动灵敏度方法，以获得所研究的特定结构的结构故障的下限。相同的自动程序能够在所分析的频率范围内检测可能的阴影部位。
Abstract Different algorithms have recently been developed for the diagnosis of many types of civil and mechanical structures using modal data, such as natural frequencies and mode shapes. Although many solutions have been proposed, some important questions seem to be absent in the technical literature. If changes in a structure's modal parameters are able to reflect structural faults, it is important to know what is the smallest detectable physical change in that structure. It is suggested that damage detection by means of modal data can be useful for macro-damage rather than for micro-damage. This resulted from numerical and experimental tests using a simple correlation between measurement noise and sensitivity of modal data, with respect to structural changes in different parts of a system. An automatic sensitivity approach is presented to obtain the lower bound of structural faults for the particular structure under study. The same automatic procedure is able to detect possible shadow sites within the frequency range analyzed.