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Article dans une revue

Using liner surface modes in acoustic ducts to make obstacles reflectionless

Abstract : Acoustic cloaking for the suppression of backscattering inside ducts is proposed in the audible range where plane waves are curved around the object using the surface modes of the liner. It is numerically shown that a slowly varying resonant liner (e.g. based on an array of tubes) creates a zone of silence in which an object of arbitrary shape can be acoustically hidden for a wide range of frequencies. And then, a resonant liner has deflecting properties without reflection of the wavefront, which are close to an ideal invisibility cloak. This kind of cloaking is effective in a wide frequency band and the cloaking band is a function of the impedance and height of the obstacle relative to the conduit. For smooth shaped obstacles, there is an ability of the object to help hide itself, which increases the cloaking frequency band (self-cloaking). Dispersion effects lead to slow sounds and distortion of the wave phase.
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https://hal.archives-ouvertes.fr/hal-02336982
Contributeur : Yves Aurégan <>
Soumis le : mardi 29 octobre 2019 - 11:16:48
Dernière modification le : jeudi 10 septembre 2020 - 13:28:44

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Maaz Farooqui, Yves Aurégan, Vincent Pagneux. Using liner surface modes in acoustic ducts to make obstacles reflectionless. Scientific Reports, Nature Publishing Group, 2019, 9 (1), ⟨10.1038/s41598-019-43538-3⟩. ⟨hal-02336982⟩

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