2013 Fiscal Year Final Research Report
Study of acoustic metamaterial with negative density and negative bulk modulus
| Project/Area Number |
24740267
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Mathematical physics/Fundamental condensed matter physics
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| Research Institution | Okayama Prefectural University |
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Principal Investigator |
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| Project Period (FY) |
2012-04-01 – 2014-03-31
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| Keywords | 音響メタマテリアル |
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| Research Abstract |
In this study the characteristics of sound wave propagation in waveguide with an array of coupled-Helmholtz resonators and that of connected acoustic pipe were investigated with numerical simulation by finite element method. In the result, it was found that the coupled-Helmholtz resonator has two resonant modes in which two resonators oscillate in the same phase and the reverse phase each other, while the connected acoustic pipe has open-pipe resonant mode and closed-pipe resonant mode. In transmission spectra of sound wave in waveguide with an array of these units, several forbidden bands due to the eigenmode of each unit and periodicity of the system were obtained.
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