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Communication Dans Un Congrès Année : 2024

Exploring acoustic wave transmission in micropolar plate in air

Christian Meso
Hervé Franklin
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Erick Ogam
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Résumé

This study explores the behavior of sound wave propagation across a micropolar plate at diverse incident angles, specifically crafted from expanded polystyrene. Through a blend of theoretical formulations and practical experimentation, we scrutinize the alterations in transmission coefficients within the frequency spectrum, shedding light on the dynamic shifts in various vibrational modes. Utilizing a comprehensive setup comprising a loudspeaker, microphone, and National Instruments acquisition system, we meticulously discerned the initial trio of longitudinal vibration modes across a broad frequency span extending up to 70k Hz. Notably, despite the plate's inherent dispersion and attenuation traits, this experimental setup proved effective. A distinctive facet of our approach lies in the deliberate incorporation of multiple incident angles, which yielded crucial insights. Notable is the identification, within the experiments, of a critical angle θ cr , marking a transitional zone. Below this threshold, distinct Lamb modes dominate, while beyond it, the emergence of micropolar modes becomes apparent. These empirically validated findings, in alignment with theoretical projections, substantially enrich our comprehension of these materials' engineering applications.
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Dates et versions

hal-04695277 , version 1 (12-09-2024)

Identifiants

  • HAL Id : hal-04695277 , version 1

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Christian Meso, Hervé Franklin, Erick Ogam, Zine El Abiddine Fellah. Exploring acoustic wave transmission in micropolar plate in air. 53rd International Congress & Exposition on Noise Control Engineering, Aug 2024, Nantes, France. ⟨hal-04695277⟩
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