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Area of Science:

  • Acoustics
  • Materials Science
  • Wave Phenomena

Background:

  • Porous materials are crucial for sound absorption.
  • Metaporous materials offer enhanced acoustic properties through engineered inclusions.
  • Understanding the role of inclusion shape and configuration is key to optimizing absorption.

Purpose of the Study:

  • To investigate the acoustic absorption properties of metaporous materials with various 3D rigid inclusions.
  • To identify optimal inclusion shapes and configurations for enhanced sound absorption.
  • To explore the influence of parameters like filling fraction, incidence angle, and flow resistivity.

Main Methods:

  • Numerical modeling of acoustic wave interaction with metaporous structures.
  • Analysis of absorption coefficients based on inclusion geometry (cube, cylinder, sphere, cone, ring torus).
  • Experimental validation using cubic and cylindrical inclusions.

Main Results:

  • Nearly total absorption achieved below quarter-wavelength resonance via trapped mode excitation.
  • Cubic inclusions show superior performance in cubic unit cells at long wavelengths.
  • Absorption is primarily dependent on filling fraction below the Bragg frequency for convex shapes.
  • Incidence angle and flow resistivity significantly influence absorption characteristics.

Conclusions:

  • Metaporous materials can achieve high sound absorption through trapped modes.
  • Inclusion shape, particularly cubic, plays a critical role in optimizing absorption.
  • The findings provide insights for designing advanced acoustic metamaterials.