Title: Acoustic measurements and modeling of air-filled underwater resonator cavities
Abstract:This project investigated the near-resonance acoustical properties of submerged air-filled resonator cavities intended for use in underwater noise abatement systems, exploring a potential alternative ...This project investigated the near-resonance acoustical properties of submerged air-filled resonator cavities intended for use in underwater noise abatement systems, exploring a potential alternative to encapsulated bubbles. The underwater resonator cavities are air-filled containers resembling Helmholtz resonators, inverted and submerged in water, creating a direct interface between the volume of air trapped inside the cavity and the surrounding water. Experiments were performed with a prototype resonator cavity in a closed water-filled laboratory tank operated in the long wavelength limit (under 500 Hz) and the resonance frequencies and Q-factors were measured for various air-fill volumes. A finite-element simulation was used to examine the behavior of the resonator cavities within the experimental tank apparatus, yielding good agreement with measurements. Finally, free-field models were also developed (a finite-element numerical model and a Helmholtz-resonator-based analytical model), both of which yielded good agreement with the tank measurements. The measurements and models presented here indicate that inexpensive and convenient sub-wavelength laboratory tank measurements, along with simple analytical models can be used to accurately design and verify the free-field behavior of low frequency underwater noise abatement resonators.Read More
Publication Year: 2015
Publication Date: 2015-04-01
Language: en
Type: article
Indexed In: ['crossref']
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