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Ultrathin Space-Shift Phase-Coherent Cancellation Metasurface for Broadband Sound Absorption.

Fuyin Ma1,2, Hao Zhang1, Xingzhong Wang1

  • 1School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an, 71009, China.

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|September 4, 2023
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Summary
This summary is machine-generated.

This study presents an ultra-thin acoustic metasurface for broadband low-frequency sound absorption. Its novel space-shift design enables effective sound energy cancellation, enhancing absorption in a compact structure.

Keywords:
broadband sound absorptionmulti-unit synergetic couplingphase-coherent cancellation metasurfacespace-shift designultra-thin sound absorber

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Area of Science:

  • Acoustics
  • Materials Science
  • Metamaterials

Background:

  • Low-frequency sound absorption typically requires bulky structures.
  • Achieving broadband absorption in thin materials is a significant challenge.
  • Existing acoustic metasurfaces often face limitations in thickness and bandwidth.

Purpose of the Study:

  • To develop an ultra-thin acoustic metasurface capable of broadband low-frequency sound absorption.
  • To investigate a novel space-shift design for enhanced sound energy cancellation.
  • To provide a clear physical explanation for the absorption mechanism in metasurfaces.

Main Methods:

  • Designing an integrated structure with multiple weakly absorbing units.
  • Utilizing a space-shift design of channel length to reduce thickness.
  • Employing space folding and a double-hole "bridge" layout for unit arrangement and coupling.
  • Analyzing the phase relationship among units for coherent cancellation.

Main Results:

  • An ultra-thin coplanar acoustic metasurface with a thickness of only λ/25 to λ/57 was achieved.
  • The metasurface demonstrated broadband sound absorption exceeding an octave.
  • Strong coupling interactions between sparsely distributed units were sustained.
  • Effective reduction in sound reflection and scattering was observed.

Conclusions:

  • The developed space-shift phase-coherent cancellation acoustic metasurface offers excellent broadband low-frequency sound absorption in an ultra-thin form factor.
  • The design overcomes the thickness limitations typically associated with low-frequency sound absorbers.
  • This technology is suitable for applications with stringent space constraints.