2023 Fiscal Year Final Research Report
Computer simulation of double-negative acoustic metamaterial composites
| Project/Area Number |
20K11848
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 60100:Computational science-related
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| Research Institution | Gifu University |
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Principal Investigator |
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| Project Period (FY) |
2020-04-01 – 2024-03-31
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| Keywords | メタマテリアル / 大規模数値シミュレーション |
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| Outline of Final Research Achievements |
The properties of acoustic metamaterial composites were investigated by computer simulations. The investigation of double-negative (DN) acoustic metamaterials for, among other things, achieving acoustic damping and the suppression of the localization of waves in acoustic systems constitutes an interesting field of study. Vibrational waves in random systems containing double-negative acoustic metamaterials were investigated. In the localization of waves in acoustic metamaterial multilayers with thickness disorder, it was observed that the participation number becomes very large inside the DN band near the characteristic frequency where the effective mass approaches zero. For acoustic metamaterial multilayers following the Fibonacci sequence, the frequency dependence of their transmittance was numerically investigated. In addition, an eigenmode analysis of random metamaterial composites was performed using the self-consistent finite-difference frequency-domain method.
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| Free Research Field |
計算物理工学
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| Academic Significance and Societal Importance of the Research Achievements |
本研究課題ではランダム・メタマテリアルという新たな観点から、メタマテリアル複合材料に関する物理的特性について明らかにした。具体的には、ダブル・ネガティブ型メタマテリアルを用いた複合材料に関して、特定の振動数領域近傍において透過率が高い値を示す、という現象を見出している。また、材料の特性において周波数分散が顕著であるというメタマテリアルの特徴的性質に適した、独自の大規模計算機シミュレーション手法の開発に成功している。一連の研究は、機械工学や音響学などの分野とも関連が深い内容であり、階層的かつ高度な性能を有するメタマテリアル複合材料の開発、また今後の工業的応用に発展する事が期待される。
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