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ELEONORA RIVA SANSEVERINO

Damage identification by Lévy ant colony optimization

  • Autori: Cottone, G.; Pirrotta, A.; FILECCIA SCIMEMI, G.; RIVA SANSEVERINO, E.
  • Anno di pubblicazione: 2010
  • Tipologia: Capitolo o Saggio (Capitolo o saggio)
  • Parole Chiave: damage identification, optimization, levy, acor
  • OA Link: http://hdl.handle.net/10447/53585

Abstract

This paper deals with the identification of incipient damage in structural elements by non-destructive test based on experimentally measured structural dynamical response. By applycation of the Hilbert transform to the recorded signal the so-called phase of the analytical signal is recovered and a proper functional is constructed in such a way that its global minimum gives a measure of the damage level, meant as stiffness reduction. Minimization is achieved by applying a modified Ant Colony Optimization (ACO) for continuous variables, inspired by the ants’ forageing behavior. The modification consists in the application of a new perturbation operator, based on alpha stable Lévy distribution. Numerical application to three degrees of freedom system is proposed to show the method and test the performance.