Transformational acoustics applied to scattering from a thin elastic shell
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Authors
Mendes Vieira, Ana Margarida R.
Subjects
Advisors
Borden, Brett
Scandrett, Clyde L.
Date of Issue
2011-06
Date
Publisher
Monterey, CA; Naval Postgraduate School
Language
Abstract
We investigate the behavior of acoustic cloaks and design an acoustic cloak applied to a thin spherical shell. We begin by examining the acoustic pressure field scattered from a spherical object, consider limiting impedance situations for a homogeneous sphere, and a thin shell. The second part of this thesis is focused on acoustic cloaking theory. Our research in this area concentrated on the application of the transformational acoustics method as a solution to model and characterize physical parameters and fields involved in an acoustics cloak parameterization. A trade-off between an effective cloak and a possible realizable metamaterial dictates the characterization of the anisotropic inertia and stiffness parameters for the cloak design. Two limiting acoustic metafluids' properties are explored. Lastly, we analyze the performance of the acoustic cloak when it is applied to scattering from a spherical shell.
Type
Thesis
Description
Series/Report No
Department
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Funding
Format
xiv, 69 p. ;
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.