Wide-band underwater acoustic absorption based on locally resonant unit and interpenetrating network structure |
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Authors: | Jiang Heng Wang Yu-Ren Zhang Mi-Lin Hu Yan-Ping Lan Ding Wu Qun-Li and Lu Huan-Tong |
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Institution: | Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, Harbin Engineering University, Harbin 150001, China; Key Laboratory of Microgravity Science, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China; BSWA Technology Co., Ltd., Beijing 100029, China |
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Abstract: | The interpenetrating network structure provides an interesting avenue to novel materials. Locally resonant phononic
crystal (LRPC) exhibits excellent sound attenuation performance based on the periodical arrangement of sound wave scatters.
Combining the LRPC concept and interpenetrating network glassy structure, this paper has developed a new material which can achieve a wide band underwater strong acoustic absorption. Underwater absorption coefficients of different samples were measured by the pulse tube. Measurement results show that the new material possesses excellent underwater acoustic effects in a wide frequency range.Moreover, in order to investigate impacts of locally resonant units,some defects are introduced into the sample. The experimental result and the theoretical calculation both show that locally resonant units being connected to a network structure play an important role in achieving a wide band strong acoustic absorption. |
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Keywords: | underwater acoustic absorption wide frequency locally
resonant unit interpenetrating networks |
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