Spiral curling type underwater sound absorption metasurface structure

Abstract

The invention belongs to the technical field of acoustic metasurface structures, and particularly relates to a spiral curling type underwater sound absorption metasurface structure which is characterized in that at least one spiral curling type underwater sound absorption metasurface structure (4) is arranged at an exit port of a cylindrical waveguide (5); the spiral curling type underwater sound absorption metasurface structure comprises a hollow cylinder shell (1), a spiral component (2) and a hollow cylinder (3), and the hollow cylinder (3) is nested in the hollow cylinder shell (1) to form a circular ring structure; and the spiral component (2) surrounds the outer circumferential wall of the hollow cylinder (3), and the hollow cylinder shell (1) wraps the spiral component (2) on the inner circumferential wall of the hollow cylinder shell (1). In the sub-wavelength size, compared with an existing sound absorption structure, the underwater low-frequency sound absorption structure is smaller in size and easy to integrate, and the problem that underwater low-frequency sound absorption is difficult to achieve is solved.

Description

technical field [0001] The invention belongs to the technical field of acoustic supersurface structures and underwater sound-absorbing equipment, and in particular relates to a spiral-curling underwater sound-absorbing supersurface structure. Background technique [0002] Compared with the sound-absorbing structure in the air environment, underwater sound absorption has always been a more difficult problem due to the higher sound velocity in water and the lower water viscosity. The main problems faced by traditional underwater sound-absorbing materials are their poor sound-absorbing performance in the low-frequency region and their bulkiness, which inevitably hinders their practical applications. [0003] At present, polymer materials such as rubber and polyurethane are widely used underwater, but they are not resistant to hydrostatic pressure. [0004] Compared with polymer homogeneous materials, particle-filled sound-absorbing materials have significantly improved sound-a...

AI Technical Summary

Problems solved by technology

[0009] 1. The volume is huge; the sound insulation of a wall or other building panels is proportional to the logarithm of its surface density (or mass per unit area); in the case of low frequencies, the sound energy is large, and a larger volume is required to meet the sound insulation or sound absorption demand, which limits the application of traditional materials in sound absorption;

[0010] 2. The low-frequency sound absorption performance is poor; the traditional sound-absorbing material itself has poor sound absorption performance. In the high-frequency band, it can attenuate the sound to a certain extent, but in the low-frequency band, there is no sound absorption performance;

[0011] 3. The sound absorption frequency band is narrow; the existing sound absorbers rely on resonance or internal thermal viscous dissipation, and the effective sound absorption bandwidth is narrow

[0012] The purpose of the present invention is to solve the problem that underwater low-frequency sound absorption is difficult to achieve on the sub-wavelength scale

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