Artificial cochlea and acoustic black hole travelling waves observation: Model and experimental results

Abstract : An inhomogeneous fluid structure waveguide reproducing passive behaviour of the inner ear is modelled with the help of the Wentzel–Kramers–Brillouin method. A physical setup is designed and built. Experimental results are compared with a good correlation to theoretical ones. The experimental setup is a varying width plate immersed in fluid and terminated with an acoustic black hole. The varying width plate provides a spatial repartition of the vibration depending on the excitation frequency. The acoustic black hole is made by decreasing the plate׳s thickness with a quadratic profile and by covering this region with a thin film of viscoelastic material. Such a termination attenuates the flexural wave reflection at the end of the waveguide, turning standing waves into travelling waves.
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Simon Foucaud, Guilhem Michon, Yves Gourinat, Adrien Pelat, François Gautier. Artificial cochlea and acoustic black hole travelling waves observation: Model and experimental results. Journal of Sound and Vibration, Elsevier, 2014, vol. 333 (n° 15), pp. 3428-3439. ⟨10.1016/j.jsv.2014.03.016⟩. ⟨hal-01111368⟩

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