Perturbation damage indicators based on complex modes. (2017)

• Record Type: Journal Article
• Authors: Lofrano, E.; Paolone, A.; Ruta, G.; Taglioni, A.
• Is Part Of: Procedia engineering. Volume 199(2017)
• Page Start: 1949
• Page End: 1954
• Publication Date: 2017
• Subjects: Structural damage identification -- dynamic identification -- non-proportional damping -- modal complexity -- perturbation approach; Engineering -- Congresses; Engineering -- Periodicals; Engineering; Conference proceedings; Periodicals; 620.005
• DOI: 10.1016/j.proeng.2017.09.297
• Languages: English
• ISSNs: 1877-7058

Abstract

Abstract: The papers focusing on dynamic identification of structural damages usually rely on the comparison of two or more responses of the structure; the measure of damage is related to the differences of the vibration signals. Almost all literature methods assume damping proportionality to mass and stiffness; however, this is acceptable for new, undamaged structures, but not for existing, potentially damaged structures, especially when localised damages occur. It is well-known that in non-proportionally damped systems the modes are no longer the same of the undamped system: thus, some authors proposed to use modal complexity as a damage indicator. This contribution presents a perturbation approach that can easily reveal such a modal complexity.