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Theses

Développement de métamatériaux super-absorbants pour l’acoustique sous-marine

Abstract : The constant evolution of sonar performance requires new designs of absorbent coatings for underwater acoustics. Such coatings are used to improve stealth of submarines but can also improve the efficiency of on-board detection systems. Bubble meta-screens (reminiscent of the so-called Alberich coatings) are a possible solution to tackle this issue. A bubble meta-screen consists of a periodic distribution of sub-wavelength air cavities trapped in a visco-elastic matrix. The cavities acoustically behave as bubbles and exhibit a low frequency resonance, known as the Minnaert resonance. Under certain conditions, the meta-screen can achieve a total absorption when placed in front of a perfect reflector. This doctoral work allowed us to build a phenomenological model, validated by numerical simulations and experiments, which can predict the reflection and transmission coefficients of the meta screen as a function of its geometric and rheological characteristics. Our model takes into account the influence of the temperature and static pressure on the performance of a meta-screen, as well as the role played by the shape of the cavities.
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  • HAL Id : tel-03132690, version 1

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Margaux Thieury. Développement de métamatériaux super-absorbants pour l’acoustique sous-marine. Physique [physics]. Université Paris sciences et lettres, 2020. Français. ⟨NNT : 2020UPSLS004⟩. ⟨tel-03132690⟩

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