Modal identification of linear non-proportionally damped systems by wavelet transform

Silvano Erlicher (1) , Pierre Argoul (2)

1 navier umr 8205 - Laboratoire Navier
2 LAMI - Laboratoire d'Analyse des Matériaux et Identification

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.

Mots clés: Modal identification; Complex modes; Shock response; Time-frequency analysis; Wavelet transform; Cauchy mother wavelet

Domaines: Traitement du signal et de l'image [eess.SP]; Mécanique [physics.med-ph]; Traitement du signal et de l'image [eess.SP]

Silvano Erlicher, Pierre Argoul. Modal identification of linear non-proportionally damped systems by wavelet transform. Mechanical Systems and Signal Processing, 2007, 21, pp.1386-1421. ⟨10.1016/j.ymssp.2006.03.010⟩. ⟨hal-00345307⟩