Share Email Print
cover

Proceedings Paper

Damage detection in structures through nonlinear excitation and system identification
Author(s): Muhammad R. Hajj; Giancarlo G. Bordonaro; Ali H. Nayfeh; John C. Duke
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper 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.

Paper Details

Date Published: 10 April 2008
PDF: 8 pages
Proc. SPIE 6935, Health Monitoring of Structural and Biological Systems 2008, 69350Q (10 April 2008); doi: 10.1117/12.776455
Show Author Affiliations
Muhammad R. Hajj, Virginia Polytechnic Institute and State Univ. (United States)
Giancarlo G. Bordonaro, Virginia Polytechnic Institute and State Univ. (United States)
Ali H. Nayfeh, Virginia Polytechnic Institute and State Univ. (United States)
John C. Duke, Virginia Polytechnic Institute and State Univ. (United States)


Published in SPIE Proceedings Vol. 6935:
Health Monitoring of Structural and Biological Systems 2008
Tribikram Kundu, Editor(s)

© SPIE. Terms of Use
Back to Top