Damage identification in a complex truss structure using modal characteristics correlation method and sensitivity-weighted search space

Nguyen, Khac-Duy and Chan, Tommy H. T. and Thambiratnam, David P. and Nguyen, Andy (2018) Damage identification in a complex truss structure using modal characteristics correlation method and sensitivity-weighted search space. Structural Health Monitoring. ISSN 1475-9217

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Damage identification for complex structures is a challenging task due to large amount of structural elements, limited number of measured modes and uncertainties in referenced numerical models. This paper presents a study on enhancing the effectiveness of modal characteristics correlation methods for damage identification of complex structures. Firstly, a correlation method using change in ratio of modal strain energy-eigenvalue (MSEE change) is introduced. Damage information is determined via a forward approach by optimizing the correlation level between the patterns of the analytical and measured MSEE changes. Different from traditional optimization-based forward methods that require accurate numerical models, damage sensitivity coefficients of MSEE are directly estimated from experimental modal information. To enhance the damage identification capability, both elemental MSEE and total MSEE components are examined in the correlation function. Secondly, a sensitivity-weighted search space (SWSS) scheme incorporated with genetic algorithm (GA) is developed to overcome the ill-posed problem that causes false detection errors. Finally, the correlation method and the enhanced technique are experimentally tested on a complex truss model with nearly 100 elements. To deal with the huge number of degrees of freedom in this structure, a multi-layout roving test with the adoption of redundant channels is designed, and a three-criterion strategy is used for the selection of modes. Results demonstrate the effectiveness of the proposed damage assessment framework to locate and estimate damage in complex truss structures.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Published online: 3 November 2018. Accepted version deposited in accordance with the copyright policy of the publisher.
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials
Date Deposited: 19 Dec 2018 05:44
Last Modified: 01 Jul 2019 02:59
Uncontrolled Keywords: Damage identification, modal strain energy, correlation-based method, genetic algorithm, search space, complex truss structure
Fields of Research : 09 Engineering > 0905 Civil Engineering > 090506 Structural Engineering
Identification Number or DOI: 10.1177/1475921718809471
URI: http://eprints.usq.edu.au/id/eprint/35122

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