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Experimental evidence of absolute band gaps in phononic crystal pipes

Abstract : The vibration filtering properties of a phononic crystal pipe whose unit cell consists of two segments of different material and cross-section are studied numerically and experimentally. Such an architected bi-material pipe leads to an alignment of the dispersion branches in the same frequency ranges for all types of waves (flexural, longitudinal, torsional), leading to an absolute band gap. Each motion is studied by a 1D model in which the propagation of Floquet-Bloch waves in lossy media are considered. The numerical optimization is based on the simplex algorithm and aims to control both the central frequency and the band width of the absolute band gap on a selected target. Experimental characterization of a demonstrator confirms the filtering effects due to partial and absolute band gaps even in the presence of quite high structural damping.
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https://hal.archives-ouvertes.fr/hal-02613369
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Soumis le : mercredi 20 mai 2020 - 09:34:14
Dernière modification le : jeudi 18 mars 2021 - 12:39:02

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Jules Plisson, Adrien Pelat, François Gautier, Vicente Romero Garcia, Thierry Bourdon. Experimental evidence of absolute band gaps in phononic crystal pipes. Applied Physics Letters, American Institute of Physics, 2020, 116 (20), pp.201902. ⟨10.1063/5.0007532⟩. ⟨hal-02613369⟩

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