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Observation and modeling of acoustic scattering from a rubber spherical shell
Aaron M Gunderson1, Timothy D Daniel2, Philip L Marston2
1Applied Research Laboratories, University of Texas at Austin, Austin, Texas 78758, USA.
The Journal of the Acoustical Society of America
|June 3, 2018
Summary
Acoustic backscattering from rubber shells reveals a unique waveguide path, crucial for understanding underwater acoustics. This discovery aids in developing advanced materials for acoustic cloaking and device protection.
Area of Science:
- Underwater acoustics
- Materials science
- Wave propagation
Background:
- Acoustic backscattering from shells is complex.
- Rubber's unique properties (subsonic speed, low shear coupling) make it fluid-like.
- Understanding acoustic behavior is vital for underwater applications.
Purpose of the Study:
- Investigate acoustic backscattering from a rubber spherical shell.
- Identify the cause of delayed enhancements in backscatter.
- Analyze the significance of waveguide paths in rubber shells.
Main Methods:
- Experimental observation of acoustic backscattering.
- Development of fluid and elastic rubber partial wave series models.
- Finite element modeling of the spherical shell.
- Waveguide normal mode analysis and Sommerfeld-Watson theory.
Main Results:
- Observed delayed enhancement in acoustic backscattering.
- Confirmed association of enhancement with a shell waveguide path.
- Demonstrated importance of the waveguide path to overall scattering.
- Accurate prediction of waveguide path arrival times using calculated velocities.
Conclusions:
- The waveguide path significantly influences acoustic backscattering from rubber shells.
- Rubber's properties make it a promising material for acoustic cloaking.
- Accurate modeling and analysis are key to understanding shell acoustics.
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