Optimization study demonstrates high dual-directional sound absorption across air and water media using composite metamaterials, highlighting potential applications for quiet marine equipment.
This study introduces a multi-scale composite metamaterial capable of simultaneously achieving dual-directional sound absorption in both air and water. Following optimization through teaching–learning-based optimization algorithms, the composite metamaterial demonstrates an average sound absorption coefficient of 0.9811 in air and 0.828 in water in the frequency range of 1 Hz to 10 kHz, representing increases of 75.79% and 177.57%, respectively. Moreover, the optimized design reduces the thickness by 7.5 mm, offering crucial insights for the silent design of marine equipment.
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Gao et al. (2026) studied this question.
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