Journal article
Observation and modeling of acoustic scattering from a rubber spherical shell
The Journal of the Acoustical Society of America, Vol.143(5), pp.3036-3046
05/2018
Handle:
https://hdl.handle.net/2376/107000
PMID: 29857700
Abstract
Acoustic backscattering from a rubber spherical shell in water is observed to contain a delayed enhancement, demonstrated to be associated with a waveguide path along the shell. This path is somewhat analogous to that of the Lamb wave observed on metallic shells. Rubber is a unique material because of its subsonic sound speed relative to water, and because shear coupling is often small enough to be neglected in typical models, making it fluid-like. This makes rubber a material of interest for coating and cloaking underwater devices and vehicles. Both fluid and elastic rubber partial wave series models are tested, using experimentally measured longitudinal and shear speeds, attenuation, and rubber density. A finite element model for the shell is also developed. Comparison of the models and experiments highlights the importance of the waveguide path to the overall scattering. Estimates for the group and phase velocities of the lowest order propagating mode in the shell are determined through waveguide normal mode analysis and Sommerfeld-Watson theory, and are shown to give good agreement with experiments in predicting the time of arrival of the waveguide path.
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Details
- Title
- Observation and modeling of acoustic scattering from a rubber spherical shell
- Creators
- Aaron M Gunderson - Applied Research Laboratories, University of Texas at Austin, Austin, Texas 78758, USATimothy D Daniel - Department of Physics and Astronomy, Washington State University, Pullman, Washington 99164, USAPhilip L Marston - Department of Physics and Astronomy, Washington State University, Pullman, Washington 99164, USAMarcia J Isakson - Applied Research Laboratories, University of Texas at Austin, Austin, Texas 78758, USA
- Publication Details
- The Journal of the Acoustical Society of America, Vol.143(5), pp.3036-3046
- Academic Unit
- Physics and Astronomy, Department of
- Publisher
- United States
- Identifiers
- 99900546853601842
- Language
- English
- Resource Type
- Journal article