Non linear damping of a plate using Faraday instability of a fluid film

Jean-Michel Génevaux (1) , Nicolas Dauchez (1) , Olivier Doutres (1)

1 LAUM - Laboratoire d'Acoustique de l'Université du Mans

Damping using an instability of a fluid film in contact with a vibrating structure is investigated. Waves induced in the fluid film is the source of the added damping. A model based on the theory of Faraday instability is applied to a clamped circular plate covered by a fluid film. It is shown that this original technique can provide a significant damping. It depends of the viscosity of the fluid, the local amplitude of the vibration, the threshold of the instability and the amplitude of the induced waves. The non linear relation between the amplitude of the waves and the plate acceleration induces a non linear damping. Theoretical and experimental results are compared. The model slightly overestimates the added damping. Comparison with viscoelastic and porous material treatments shows that damping are of the same order.

Domaines: Vibrations [physics.class-ph]; Vibrations [physics.class-ph]

Jean-Michel Génevaux, Nicolas Dauchez, Olivier Doutres. Non linear damping of a plate using Faraday instability of a fluid film. Journal of Sound and Vibration, 2009, 326, pp.150,160. ⟨10.1016/j.jsv.2009.04.038⟩. ⟨hal-00323586v1⟩