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A Time Domain Technique for Defect Identification Based on a Continuous Damage Model

[+] Author Affiliations
Daniel A. Castello, Leonardo T. Stutz, Fernando A. Rochinha

Federal University of Rio de Janeiro, Rio de Janeiro, Brazil

Paper No. IMECE2002-33978, pp. 325-331; 7 pages
doi:10.1115/IMECE2002-33978
From:
  • ASME 2002 International Mechanical Engineering Congress and Exposition
  • Adaptive Structures and Materials Systems
  • New Orleans, Louisiana, USA, November 17–22, 2002
  • Conference Sponsors: Aerospace Division
  • ISBN: 0-7918-3625-8 | eISBN: 0-7918-1691-5, 0-7918-1692-3, 0-7918-1693-1
  • Copyright © 2002 by ASME

abstract

A technique for a non-destructive detection, location and severity determination of structural defects by means of a time domain technique is presented. Since damage in a structure causes changes in the physical coefficients of elastic modulus and damping parameters, the response of an undamaged and a damaged structure to the same input excitation is different, and this can be used in a damage identification strategy. The present work uses a continuous damage model to describe the current integrity state of a structure. In order to determine this state of structural damage the minimization of an error function is desired, such a function is basically the difference between the time response of the structural model and the real structure one to the same input excitation. The effectiveness of the proposed technique is assessed on a beam like structure, where displacements, accelerations or strains may considered as being measured at a subset of the system degrees of freedom. In order to furnish realism to performed simulations, the corrupting effects of signal filtering and sampling are considered. The analysis of the results for different levels of signal-to-noise ratio is also carried on.

Copyright © 2002 by ASME

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