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Smart Structures and Systems Volume 8, Number 2, August 2011 , pages 191-204 DOI: https://doi.org/10.12989/sss.2011.8.2.191 |
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Damage observability, localization and assessment based on eigenfrequencies and eigenvectors curvatures |
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Jacopo Ciambella, Fabrizio Vestroni and Stefano Vidoli
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| Abstract | ||
| A technique for damage localization and assessment based on measurements of both eigenvectors curvatures and eigenfrequencies is proposed. The procedure is based on two successive steps: a model independent localization, based on changes of modal curvatures, and the solution of a one-dimensional minimization problem to evaluate damage intensity. The observability properties of damage parameters is discussed and, accordingly, a suitable change of coordinates is introduced. The proposed technique is illustrated with reference to a cantilever Euler beam endowed with a set of piezoelectric transducers. To assess the robustness of the algorithm, a parametric study of the identification errors with respect to the number of transducers and to the number of considered modal quantities is carried out with both clean and noisecorrupted data. | ||
| Key Words | ||
| damage detection; structural health monitoring; frequency response function; piezoelectric sensors. | ||
| Address | ||
| Jacopo Ciambella, Fabrizio Vestroni and Stefano Vidoli : Dipartimento di Ingegneria Strutturale e Geotecnica, Universita di Roma | ||