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Passive Underwater Noise Attenuation Using Large Encapsulated Air Bubbles.

Kevin M Lee1, Mark S Wochner2, Preston S Wilson3,4

  • 1Applied Research Laboratories, The University of Texas at Austin, Austin, TX, 78713, USA. klee@arlut.utexas.edu.

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|November 28, 2015
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Summary

Large encapsulated bubbles effectively reduce low-frequency underwater sound. A model for ultrasound contrast agents accurately predicts this sound attenuation, aiding in designing noise abatement systems.

Keywords:
Anthropogenic noise abatementUnderwater noise

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Area of Science:

  • Acoustics
  • Materials Science
  • Fluid Dynamics

Background:

  • Underwater noise pollution is a growing concern.
  • Effective methods for underwater sound attenuation are needed.
  • Bubbly liquids exhibit unique acoustic properties.

Purpose of the Study:

  • To investigate low-frequency underwater sound attenuation using encapsulated bubbles.
  • To compare experimental measurements with effective medium models.
  • To validate a model for designing underwater noise abatement systems.

Main Methods:

  • Experimental measurements of sound attenuation using arrays of large, tethered, stationary encapsulated bubbles.
  • Comparison of experimental data with various effective medium models.
  • Focus on frequencies below 1 kHz and bubble sizes around 10 cm.

Main Results:

  • Experimental measurements showed good agreement with a specific effective medium model.
  • The model, originally for ultrasound contrast agents, accurately predicted attenuation for large bubbles.
  • The model is applicable for frequencies below 1 kHz.

Conclusions:

  • Encapsulated bubbles are effective for low-frequency underwater sound attenuation.
  • A validated model can guide the design of encapsulated-bubble-based noise abatement systems.
  • Reduced uncertainty in system performance is achievable with the validated model.