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Article Dans Une Revue Journal of Sound and Vibration Année : 2018

Acoustic characterization of a nonlinear vibroacoustic absorber at low frequencies and high sound levels

Résumé

A nonlinear vibroacoustic absorber (Nonlinear Energy Sink: NES), involving a clamped thin membrane made in Latex, is assessed in the acoustic domain. This NES is here considered as an one-port acoustic system, analyzed at low frequencies and for increasing excitation levels. This dynamic and frequency range requires a suitable experimental technique, which is presented first. It involves a specific impedance tube able to deal with samples of sufficient size, and reaching high sound levels with a guaranteed linear response thank's to a specific acoustic source. The identification method presented here requires a single pressure measurement, and is calibrated from a set of known acoustic loads. The NES reflection coefficient is then estimated at increasing source levels, showing its strong level dependency. This is presented as a mean to understand energy dissipation. The results of the experimental tests are first compared to a nonlinear viscoelastic model of the membrane absorber. In a second step, a family of Helmholtz resonator is identified from the measurements, allowing a parametric description of the NES behavior over a wide range of levels.
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Dates et versions

hal-01636357 , version 1 (02-05-2018)

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Alice Chauvin, Mélodie Monteil, Sergio Bellizzi, Renaud Côte, Philippe Herzog, et al.. Acoustic characterization of a nonlinear vibroacoustic absorber at low frequencies and high sound levels. Journal of Sound and Vibration, 2018, 416, pp.244-257. ⟨10.1016/j.jsv.2017.11.031⟩. ⟨hal-01636357⟩
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