Underwater acoustic ground cloak development and demonstration
| Autor: | Benjamin S. Beck, Peter Kerrian, Amanda D. Hanford, Dean E. Capone |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Physics
Void (astronomy) Acoustics and Ultrasonics Physics::Instrumentation and Detectors Acoustics Coordinate system Cloak Physics::Optics Cloaking Metamaterial 02 engineering and technology Physics::Classical Physics 021001 nanoscience & nanotechnology 01 natural sciences Arts and Humanities (miscellaneous) Homogeneous 0103 physical sciences Underwater 010306 general physics 0210 nano-technology Anisotropy |
| Zdroj: | The Journal of the Acoustical Society of America. 143:1918-1918 |
| ISSN: | 0001-4966 |
| Popis: | Acoustic ground cloaks, which conceal an object on a rigid surface, utilize a linear coordinate transformation to map the flat surface to a triangular void by compressing space into two triangular cloaking regions consisting of a homogeneous anisotropic acoustic metamaterial. Transformation acoustics allows for the realization of a coordinate transformation through a reinterpretation of the scale factors as a new material in the original coordinate system. An underwater acoustic ground cloak was constructed from perforated steel plates and experimentally tested to conceal an object on a pressure release surface. The perforated plate acoustic ground cloak successfully cloaked the scattered object. There was excellent agreement between the phase of the surface reflection and cloak reflection with a small amplitude difference. Above 15 [kHz], the cloaking performance decreased as the effective material parameters of the perforated plate metamaterial deviated from the required material parameters.Acoustic ground cloaks, which conceal an object on a rigid surface, utilize a linear coordinate transformation to map the flat surface to a triangular void by compressing space into two triangular cloaking regions consisting of a homogeneous anisotropic acoustic metamaterial. Transformation acoustics allows for the realization of a coordinate transformation through a reinterpretation of the scale factors as a new material in the original coordinate system. An underwater acoustic ground cloak was constructed from perforated steel plates and experimentally tested to conceal an object on a pressure release surface. The perforated plate acoustic ground cloak successfully cloaked the scattered object. There was excellent agreement between the phase of the surface reflection and cloak reflection with a small amplitude difference. Above 15 [kHz], the cloaking performance decreased as the effective material parameters of the perforated plate metamaterial deviated from the required material parameters. |
| Databáze: | OpenAIRE |
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