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Abstract
Low-frequency noise has been a long-standing issue in the context of a complex underwater environment. While theory related to low-frequency sound insulation in air has been developed, systematic research on underwater sound insulation has not yet been established. In our work, we used a chiral variable pitch spiral structure to study underwater low-frequency sound insulation and calculated the sound insulation effect using different parameters. Our results show that the fixed-pitch spiral structure has a better effect on underwater sound insulation and can achieve 3505 Hz–5355 Hz wide-band sound insulation. This spiral structure breaks through the limitation of appearance and can achieve sound insulation at the frequency of interest without changing the outer profile of the structure. Accordingly, it has potential in underwater low-frequency sound insulation applications.
Highlights
Traditional sound insulation relies on reflection typically caused by an impedance mismatch or relies on the energy dissipation of viscous materials
At a low-frequency, traditional sound insulation methods are characterized by a large volume, which limits their potential in low-frequency noise control applications
We attempted to use a fixed-pitch helix in the same structure to optimize the underwater sound insulation
Summary
Traditional sound insulation relies on reflection typically caused by an impedance mismatch or relies on the energy dissipation of viscous materials. To achieve low-frequency sound insulation, either a large air cavity is required to be filled in the structure or the thickness of the structure must be increased In applications, these devices can reduce the pressure resistance but can complicate the manufacturing process because each time the research frequency band is changed, the device must be redesigned. A chiral varying pitch spiral structure achieved low-frequency broadband sound insulation based on the response of the monopolar and dipolar modes of metamaterials.28 Such a structure provides a plane profile subwavelength thick acoustic ventilation barrier, which can control a small-sized system and achieve specific frequency noise elimination by changing the parameters of helical pathways. This method overcomes the limitations of the external contour and can achieve ideal impedance by adjusting the parameters of the spiral without changing the structural outer profile
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