Abstract
Purpose
The low-frequency noise radiated by ships has a significant impact on marine animals; however, traditional ship sound-absorbing materials are not optimal for low-frequency noise control. Therefore, an acoustic metasurface suitable for low-frequency noise control is devised using a spatial folding structure, which is composed of folded channels and perforated structural units.
Methods
Numerical methods are used to investigate the acoustic characteristics and absorption mechanism of the metasurface, and the impact of common structural factors on the acoustic performance of the metasurface is studied. An experimental model is produced with 3D printing technology, and the structure's absorption coefficient is examined.
Results
A composite acoustic metasurface is designed by coupling multiple cells, and the designed metasurface structure achieves continuous broadband sound absorption in the range of 125–200 Hz. The structure exhibits subwavelength absorption characteristics and has an average absorption coefficient of 0.886 in the target frequency range, with a thickness of 1/27 of the wavelength.
Conclusion
Folded channels extend the propagation path of acoustic waves, lead to lower absorption frequencies, and the coupled multicell design broadens the absorption bandwidth. The proposed coupled multicell folded low-frequency acoustic metasurface structure has excellent sound absorption performance and provides new ideas for the design of marine low-frequency broadband acoustic absorbers.
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Yin, X., Cui, H., Xu, D. et al. Composite Acoustic Metasurfaces Based on Coiled-Up Space. J. Vib. Eng. Technol. 12, 3321–3334 (2024). https://doi.org/10.1007/s42417-023-01046-9
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DOI: https://doi.org/10.1007/s42417-023-01046-9