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• W2023939944 abstract "Time–frequency analysis of various simulated and experimental signals due to elastic wave scattering from damage are performed using wavelet transform (WT) and Hilbert–Huang transform (HHT) and their performances are compared in context of quantifying the damages. Spectral finite element method is employed for numerical simulation of wave scattering. An analytical study is carried out to study the effects of higher-order damage parameters on the reflected wave from a damage. Based on this study, error bounds are computed for the signals in the spectral and also on the time–frequency domains. It is shown how such an error bound can provide an estimate of error in the modelling of wave propagation in structure with damage. Measures of damage based on WT and HHT is derived to quantify the damage information hidden in the signal. The aim of this study is to obtain detailed insights into the problem of (1) identifying localised damages (2) dispersion of multifrequency non-stationary signals after they interact with various types of damage and (3) quantifying the damages. Sensitivity analysis of the signal due to scattered wave based on time–frequency representation helps to correlate the variation of damage index measures with respect to the damage parameters like damage size and material degradation factors." @default.
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• W2023939944 date "2009-03-01" @default.
• W2023939944 modified "2023-09-27" @default.
• W2023939944 title "On the sensitivity of elastic waves due to structural damages: Time–frequency based indexing method" @default.
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• W2023939944 doi "https://doi.org/10.1016/j.jsv.2008.09.008" @default.
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