Modal identification of linear non-proportionally damped systems by wavelet transform |
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Affiliation: | Laboratoire d’Analyse des Matériaux et Identification LAMI (ENPC/LCPC-Institut Navier), 6 et 8 av. B. Pascal, Cité Descartes, Champs-sur-Marne, 77455 Marne-la-Vallée, Cedex 2, France |
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Abstract: | A time-frequency identification technique based on wavelet transform is formulated and applied to free-decay responses of linear systems with non-proportional viscous damping. The Cauchy mother wavelet is used. Frequencies, modal damping ratios and complex mode shapes are identified from output-only free vibration signals. This identification technique has also shown to be effective when the (non-proportional) damping is significant. |
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