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1 Journal of Theoretical and Applied Mechanics

1 2025

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Study on noise control of tunable fluid-solid coupled phononic crystal structures in the context of enclosed fish farms

Qian Denghui, Zhuang Jiawei, Zhang Shengke

Journal of Theoretical and Applied Mechanics

2025

Vol. 63 nr 2

363--374

Identifying innovative strategies to mitigate underwater noise, which exerts a wide array of detrimental effects on fish physiology, behavior, biodiversity, and entire aquatic ecosystems, presents a significant scientific challenge in the conservation of marine environments. The sources of underwater noise are well-documented and encompass marine transportation, geological exploration, and various industrial activities in marine environments. In addressing these concerns, we propose a solid cylindrical structure of fluid-solid coupled phononic crystals that leverages the local resonance mechanism. The finite element method is employed to analyze the bandgap characteristics and acoustic transmission loss of the finite periodic structure. Furthermore, we investigate the influence of structural parameters on the attenuation frequency range of the bandgap. Building on this analysis, we design a hollow cylindrical structure of fluid-solid coupled phononic crystals, which demonstrates superior sound insulation performance for frequencies below 300 Hz. Additionally, we propose filling the hollow cylinders with fluid to modulate the bandgap of the structure. This study introduces an innovative approach to controlling underwater noise and modulating the phononic crystal bandgap, providing essential insights into the preservation of aquatic ecosystems and mitigating the detrimental influence of underwater noise on marine organisms.