Ventilation barrier with space-coiling channels of varying cross-section for broadband sound insulation

Xiang, Lei; Wang, Gongxian; Zhu, Chao; Shi, Mengfei; Hu, Jingzheng; Luo, Gang

doi:10.1016/j.apacoust.2022.109110

Cited by 9 publications

(1 citation statement)

References 39 publications

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“…This was pioneering of Ghaffarivardavagh et al, and provided effective guidance for the development of more practical sound insulators. Using this method, some novel acoustic metamaterials have been developed, such as a ventilated acoustic meta-barrier based on layered Helmholtz resonators [ 31 ], a three-dimensional reticular structure made with spheres [ 32 ], a ventilation barrier with space-coiling channels [ 33 ], a subwavelength acoustic metamaterial based on labyrinthine structures [ 34 ], an arch-like labyrinthine acoustic metasurface [ 35 ], a ventilated soundproof acoustic metamaterial consisting of resonant cavities arranged around a central air passage [ 36 ], nonlocal ventilating metasurfaces [ 37 ], etc. However, the shapes of these air-permeable acoustic metamaterials were complex, which meant that corresponding fabrications were difficult to realize and that their actual applications were limited.…”

Section: Introductionmentioning

confidence: 99%

Study on Sound-Insulation Performance of an Acoustic Metamaterial of Air-Permeable Multiple-Parallel-Connection Folding Chambers by Acoustic Finite Element Simulation

Peng

Shen

et al. 2023

Materials

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In order to achieve a balance between sound insulation and ventilation, a novel acoustic metamaterial of air-permeable multiple-parallel-connection folding chambers was proposed in this study that was based on Fano-like interference, and its sound-insulation performance was investigated through acoustic finite element simulation. Each layer of the multiple-parallel-connection folding chambers consisted of a square front panel with many apertures and a corresponding chamber with many cavities, which were able to extend both in the thickness direction and in the plane direction. Parametric analysis was conducted for the number of layers nl and turns nt, the thickness of each layer L2, the inner side lengths of the helical chamber a1, and the interval s among the various cavities. With the parameters of nl = 10, nt = 1, L2 = 10 mm, a1 = 28 mm, and s = 1 mm, there were 21 sound-transmission-loss peaks in the frequency range 200–1600 Hz, and the sound-transmission loss reached 26.05 dB, 26.85 dB, 27.03 dB, and 33.6 dB at the low frequencies 468 Hz, 525 Hz, 560 Hz, and 580 Hz, respectively. Meanwhile, the corresponding open area for air passage reached 55.18%, which yielded a capacity for both efficient ventilation and high selective-sound-insulation performance.

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