Tracking the variation of complex mode shapes for damage quantification and localization in structural systems

被引：15
|
作者：
Masciotta, M. G. [1 ,2 ]
Pellegrini, D. [2 ]
机构：
[1] Univ G dAnnunzio, Dept Engn & Geol, Pescara, Italy
[2] ISTI CNR, Inst Informat Sci & Technol A Faedo, Pisa, Italy
来源：
MECHANICAL SYSTEMS AND SIGNAL PROCESSING | 2022年 / 169卷
关键词：
Complex modal analysis; Nonproportional damping; Complex vibration modes; Damage localization index; Structural health monitoring; IDENTIFICATION;
D O I：
10.1016/j.ymssp.2021.108731
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
Real structures mode shapes estimated by modal analysis techniques have a common feature: in most cases they are complex, and their level of complexity can be soundly influenced by the presence and extent of physical damage, which also affects the distribution of energy dissipation mechanisms within the structures. Starting from the contributions available in the literature, the present paper investigates, from a numerical and experimental point of view, the correlation existing between localized damage and variation of global modal complexity indices conven-tionally employed to quantify the nonproportionality of damping in structural systems. Finally, driven by the inferences made through numerical and experimental test cases by tracking the variation of complex modes over multiple and progressive damage scenarios, a new index for damage localization and quantification is formulated and validated against real data.
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收藏
页数：27
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