Using simple shape three-dimensional rigid inclusions to enhance porous layer absorption.

@article{Groby2014UsingSS,
  title={Using simple shape three-dimensional rigid inclusions to enhance porous layer absorption.},
  author={J. P. Groby and C{\'e}line Lagarrigue and Beno{\^i}t Brouard and Olivier Dazel and Vincent Tournat and Benoit Nennig},
  journal={The Journal of the Acoustical Society of America},
  year={2014},
  volume={136 3},
  pages={
          1139
        }
}
The absorption properties of a metaporous material made of non-resonant simple shape three-dimensional rigid inclusions (cube, cylinder, sphere, cone, and ring torus) embedded in a rigidly backed rigid-frame porous material are studied. A nearly total absorption can be obtained for a frequency lower than the quarter-wavelength resonance frequency due to the excitation of a trapped mode. To be correctly excited, this mode requires a filling fraction larger in three-dimensions than in two… CONTINUE READING
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