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Coupled Resonators for Sound Trapping and Absorption.

Rasha Al Jahdali1, Ying Wu2

  • 1King Abdullah University of Science and Technology (KAUST), Division of Computer, Electrical and Mathematical Sciences and Engineering, Thuwal, 23955-6900, Saudi Arabia.

Scientific Reports
|September 16, 2018
PubMed
Summary
This summary is machine-generated.

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This study introduces a novel sound trapping device using coupled Helmholtz resonators to prevent sound wave leakage. The design enables effective sound wave confinement and high energy absorption within an air waveguide.

Area of Science:

  • Acoustics
  • Wave phenomena
  • Metamaterials

Background:

  • Resonance-based sound trapping devices suffer from sound wave leakage, limiting their effectiveness.
  • Coupled Helmholtz resonators offer a potential solution to mitigate wave leakage issues.

Purpose of the Study:

  • To design and analyze a sound trapping device that overcomes wave leakage using coupled Helmholtz resonators.
  • To demonstrate the ability of the proposed device to confine and absorb sound wave energy.

Main Methods:

  • Analytical modeling based on Newton's second law.
  • Numerical analysis using the finite-element method.
  • Derivation of an effective medium theory.

Main Results:

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  • The coupled resonator structure creates transmission spectrum dips.
  • A negative effective bulk modulus and flat bands are induced near resonance frequencies.
  • The device demonstrates effective trapping and high absorption of sound wave energy.

    • Conclusions:

    • The proposed coupled Helmholtz resonator design effectively tackles sound wave leakage in waveguides.
    • The device facilitates sound wave confinement and significant energy absorption.
    • The findings are supported by analytical, numerical, and effective medium theories.