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Communication Dans Un Congrès Année : 2024

Acoustic radiation of a fluid-saturated microperforated plate

Résumé

The vibration of fluid-loaded microperforated plate (MPP) was studied theoretically and experimentally in a previous work by the authors. It has been shown that these plates dissipate energy and can be substantially damped thanks to thermo-viscous dissipations taking place in the thermo-viscous skin at the level of the solid wall of the perforations. The motion of the vibrating solid induces that of the fluid in the perforations. The aim of this work is to explore the acoustic radiation of a perforated periodic cell to investigate the intercellular coupling and the complexity of near-field radiation, and to derive a criterion related to the near-field far-field transition. A numerical modeling using the finite element method is applied to solve the elastic and thermo-visco-acoustic (TVA) multiphysics problem. The TVA calculates explicitly the thermo-viscous losses on the acoustic wave in the periodic cell studied. Numerical results show that the distance of the near-far field transition is significant at low frequencies, passing through a minimum for a frequency depending on perforation parameters (diameter and ratio) before increasing again as a frequency function. Vibroacoustic indicators, including mean square velocity, radiated sound power and radiation efficiency, are compared with those derived from the theoretical MPP vibration model.
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Dates et versions

hal-04484935 , version 1 (01-03-2024)

Identifiants

  • HAL Id : hal-04484935 , version 1

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Lucie Gallerand, Mathias Legrand, Thomas Dupont, Raymond Panneton, Philippe Leclaire​. Acoustic radiation of a fluid-saturated microperforated plate. Inter-Noise 2024, Aug 2024, Nantes, France. ⟨hal-04484935⟩
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