Damage detection in structures through nonlinear excitation and system identification

Muhammad R. Hajj, Giancarlo G. Bordonaro, Ali H. Nayfeh, John C. Duke

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Variations in parameters representing natural frequency, damping and effective nonlinearities before and after damage initiation in a beam carrying a lumped mass are assessed. The identification of these parameters is performed by exploiting and modeling nonlinear behavior of the beam-mass system and matching an approximate solution of the representative model with quantities obtained from spectral analysis of measured vibrations. The representative model and identified coefficients are validated through comparison of measured and predicted responses. Percentage variations of the identified parameters before and after damage initiation are determined to establish their sensitivities to the state of damage of the beam. The results show that damping and effective nonlinearity parameters are more sensitive to damage initiation than the system's natural frequency. Moreover, the sensitivity of nonlinear parameters to damage is better established using a physically-derived parameter rather than spectral amplitudes of harmonic components.

Original languageEnglish
Title of host publicationHealth Monitoring of Structural and Biological Systems 2008
DOIs
StatePublished - 2008
EventHealth Monitoring of Structural and Biological Systems 2008 - San Diego, CA, United States
Duration: 10 Mar 200813 Mar 2008

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume6935
ISSN (Print)0277-786X

Conference

ConferenceHealth Monitoring of Structural and Biological Systems 2008
Country/TerritoryUnited States
CitySan Diego, CA
Period10/03/0813/03/08

Keywords

  • Damage initiation
  • Nonlinear excitation
  • Parameter identification
  • Parameter sensitivity

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