TY - GEN
T1 - Damage characterization through nonlinear analysis of transient vibrations
AU - Hajj, M. R.
AU - Chabalko, C. C.
AU - Duke, J. C.
AU - El-Borgi, S.
AU - Elouafi, S. Bahlous
AU - Choura, S.
PY - 2006
Y1 - 2006
N2 - The basic notion behind vibration-based structural health monitoring is that changes in the physical properties of the structure such as mass, flexibility and stiffness vary the structural response characteristics such as the natural frequencies, mode shapes and damping ratio. Because of their dependence on environmental and other conditions than on damage, natural frequencies alone may not be sensitive enough to be used as parameters for damage characterization. This work aims to present specific nonlinear parameters and show their relatively higher sensitivity, in comparison to natural frequencies, to damage conditions. Because ambient vibrations can be transient and nonstationary, wavelet-based higher-order spectral moments are proposed as the tools to derive these parameters. As a numerical example, the higher sensitivity of the nonlinear parameters is demonstrated through the analysis of the damped response of a nonlinear system. The same nonlinear parameters are derived from vibration measurements of an eight-span simply supported bridge with a continuous slab over the SidiBouAli river in Tunisia to show that these parameters can be derived from full scale tests.
AB - The basic notion behind vibration-based structural health monitoring is that changes in the physical properties of the structure such as mass, flexibility and stiffness vary the structural response characteristics such as the natural frequencies, mode shapes and damping ratio. Because of their dependence on environmental and other conditions than on damage, natural frequencies alone may not be sensitive enough to be used as parameters for damage characterization. This work aims to present specific nonlinear parameters and show their relatively higher sensitivity, in comparison to natural frequencies, to damage conditions. Because ambient vibrations can be transient and nonstationary, wavelet-based higher-order spectral moments are proposed as the tools to derive these parameters. As a numerical example, the higher sensitivity of the nonlinear parameters is demonstrated through the analysis of the damped response of a nonlinear system. The same nonlinear parameters are derived from vibration measurements of an eight-span simply supported bridge with a continuous slab over the SidiBouAli river in Tunisia to show that these parameters can be derived from full scale tests.
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U2 - 10.2514/6.2006-2243
DO - 10.2514/6.2006-2243
M3 - Conference contribution
AN - SCOPUS:34247137205
SN - 1563478080
SN - 9781563478086
T3 - Collection of Technical Papers - AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference
SP - 7747
EP - 7755
BT - Collection of Technical Papers - 47th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference
T2 - 47th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference
Y2 - 1 May 2006 through 4 May 2006
ER -