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Vers une nouvelle technique de contrôle passif du bruit : absorbeur dynamique non linéaire et pompage énergétique

Abstract : The combination of a nonlinear absorber with a linear primary system may allow to observe the energy pumping phenomenon. The work of this thesis was to apply this concept in acoustics, that is to say to work on a new technique of passive noise control using a nonlinear absorber. This technique would be effective for the low frequencies, where absorbing materials are ineffective. An experimental academic set-up has been developed using the air inside a tube as the primary acoustic system, a thin circular visco-elastic membrane with cubic stiffness as the nonlinear absorber and the air in a large box to ensure a weak coupling between these two elements. A model of this set-up has also been developed in order to conduct simulations. In free vibrations, the energy pumping results in a rapid decrease of noise level in the tube while the energy, initially present in the primary system, is fully localized on the membrane and dissipated by viscosity in it without any return to the acoustic system. That's why we talk about targeted energy transfer in the literature, as well as energy pumping. But this is only possible above a certain energy threshold below which the membrane has no particular action. In the frequency domain, under certain energy level conditions, the membrane is able to simply clipping the first resonance peak of the acoustic system, without modifying its initial response around it.
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Contributor : Romain Bellet <>
Submitted on : Thursday, December 9, 2010 - 1:38:42 PM
Last modification on : Thursday, January 23, 2020 - 6:22:03 PM
Long-term archiving on: : Thursday, March 10, 2011 - 12:46:04 PM


  • HAL Id : tel-00544719, version 1


Romain Bellet. Vers une nouvelle technique de contrôle passif du bruit : absorbeur dynamique non linéaire et pompage énergétique. Acoustique [physics.class-ph]. Université de Provence - Aix-Marseille I, 2010. Français. ⟨tel-00544719⟩



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