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| Technical Progress and Application Prospect of Locally Resonant Sonic Metamaterials |
| Received:February 10, 2019 Revised:March 04, 2019 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2019.08.009 |
| KeyWord:Locally resonant acoustic metamaterial low-frequency noise sound band |
| Author | Institution |
| HUANG An-wei |
Southwest Technology and Engineering Research Institute, Chongqing , China |
| WU Yong-peng |
Southwest Technology and Engineering Research Institute, Chongqing , China |
| LI Zhong-sheng |
Southwest Technology and Engineering Research Institute, Chongqing , China |
| SUN Cai-yun |
Southwest Technology and Engineering Research Institute, Chongqing , China |
| DONG Ling-shu |
Southwest Technology and Engineering Research Institute, Chongqing , China |
| SHU Lu |
Southwest Technology and Engineering Research Institute, Chongqing , China |
| WU Dao-xun |
Southwest Technology and Engineering Research Institute, Chongqing , China |
| HUA Ze-hui |
Southwest Technology and Engineering Research Institute, Chongqing , China |
| LUO Ming-bo |
Southwest Technology and Engineering Research Institute, Chongqing , China |
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| Abstract: |
| Bragg scattering phonon crystal and locally resonant acoustic metamaterials were introduced. In order to generate noise reduction, the lattice constant of Bragg scattering phonon crystal should be of the same order of magnitude as the wavelength of the sound wave, therefore, its application field is limited. Locally resonant acoustic metamaterials consume sound energy by coupling its own resonant frequencies with those of sound waves at close range. Its size is two orders of magnitude smaller than the wavelength of sound wave; thus, the control of low-frequency noise by small-size acoustic metamaterials is realized. Locally resonant acoustic metamaterials have some extraordinary physical characteristic in the conventional medium for their special acoustic structural units, such as negative refraction and negative mass density. Especially in low frequency band, they have acoustic forbidden band in which the sound wave transmission is prohibited. Acoustic structural unit having resonant characteristics has been developed. Surface-mounted resonant element plate structures and thin film acoustic metamaterials are the normal types of locally resonant acoustic metamaterials. Their research and development provide a new method for low-frequency noise control. |
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