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An acoustic double fishnet using Helmholtz resonators.

A R J Murray1, I R Summers1, J R Sambles1

  • 1Electromagnetic and Acoustic Materials, Department of Physics and Astronomy, University of Exeter, Stocker Road, Exeter, EX4 4QL, United Kingdom.

The Journal of the Acoustical Society of America
|September 6, 2014
PubMed
Summary
This summary is machine-generated.

This study explores acoustic transmission through patterned plates, creating Helmholtz resonators to lower sound frequencies. The modified double fishnet design significantly reduces the stop band center frequency compared to conventional designs.

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Area of Science:

  • Acoustics
  • Materials Science
  • Mechanical Engineering

Background:

  • Acoustic metamaterials offer unique sound manipulation capabilities.
  • Conventional acoustic double fishnet designs exhibit specific sound transmission properties.
  • Helmholtz resonators are known for their acoustic resonance characteristics.

Purpose of the Study:

  • To investigate the acoustic transmission properties of a modified acoustic double fishnet design.
  • To explore the use of patterned and perforated plates to create an array of Helmholtz resonators.
  • To determine the effect of this design on the center frequency of the acoustic stop band.

Main Methods:

  • Experimental investigation of acoustic transmission in air.
  • Utilizing a closely spaced pair of patterned and perforated rigid plates.
  • Employing a finite element model for theoretical predictions.

Main Results:

  • The modified structure effectively acts as an array of Helmholtz resonators within the gap.
  • A significant reduction (factor > 2) in the stop band center frequency was achieved.
  • Experimental results showed good agreement with the finite element model predictions.

Conclusions:

  • The proposed acoustic double fishnet design with integrated Helmholtz resonators offers enhanced control over sound transmission.
  • This approach enables a substantial shift in the stop band frequency, offering potential for novel acoustic applications.
  • The finite element model is a reliable tool for predicting the acoustic behavior of such structures.