Smart Structures and Systems

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Damage observability, localization and assessment based on eigenfrequencies and eigenvectors curvatures

  • Ciambella, Jacopo (Dipartimento di Ingegneria Strutturale e Geotecnica, Universita di Roma "La Sapienza") ;
  • Vestroni, Fabrizio (Dipartimento di Ingegneria Strutturale e Geotecnica, Universita di Roma "La Sapienza") ;
  • Vidoli, Stefano (Dipartimento di Ingegneria Strutturale e Geotecnica, Universita di Roma "La Sapienza")
  • Received : 2010.06.05
  • Accepted : 2011.05.15
  • Published : 2011.08.25
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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 noise-corrupted data.

Keywords

References

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