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Underwater acoustic absorbing metamaterials by material-structure-functionality collaborative optimization
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DOI：10.1016/j.ijmecsci.2024.109573.png)
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摘要
En 中文
Underwater acoustic metamaterials have provided new ideas for underwater acoustic stealth of various underwater vehicles. However, the existing sound absorption performances are still limited by the intuitive design or geometry-only optimization. To systematically construct the low-frequency broadband underwater absorbing metamaterials under rigorous constraints of ultrathin thickness and specific material parameter ranges, this paper proposes a material-structure-functionality collaborative optimization method that synthesizes the variational material parameters and topological configurations as the whole design variables for underwater sound absorption in the prescribed frequency range. Diverse inverse-designed metamaterials are shown to support low-frequency, broadband, and high-efficiency (>90 %) sound absorption with thin thickness. All low-frequency broadband absorption characteristics are revealed to be dominated by the resonance superposition along with a certain amount of wave mode conversion. In particular, a representative metamaterial can achieve an average sound absorption of 90 % within the range of 300 similar to 10,000 Hz. Another ultrathin metamaterial with a thickness of 1/200 wavelength obtains the effective low-frequency absorption (>50 %) at 300 Hz. Finally, the underwater sound tube tests demonstrate the customized low-frequency broadband sound-absorbing functionality. The proposed inverse-design methodology and underwater acoustic metamaterials may offer guidance for underwater acoustic stealth technology, acoustic communication, and detection technology, etc.
Keyword:
Underwater acoustic metamaterials
Topology optimization
Collaborative optimization
Broadband absorption
Resonance superposition
期刊
IF:
9.4
论文数:
1.0W
被引数:
4.5W
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