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Smart Structures and Systems
  Volume 8, Number 2, August 2011 , pages 191-204

Damage observability, localization and assessment based on eigenfrequencies and eigenvectors curvatures
Jacopo Ciambella, Fabrizio Vestroni and Stefano Vidoli

    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.
Jacopo Ciambella, Fabrizio Vestroni and Stefano Vidoli : Dipartimento di Ingegneria Strutturale e Geotecnica, Universita di Roma

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