Papers
Release Time: 2025-04-30Hits:
- Date:2025-04-30
- Title of Paper:Broadband sound absorption of a nested doll metasurface with multi-slit synergetic resonant
- Journal:J. Phys. D: Appl. Phys.
- Summary:A sound-absorbing metasurface with a multi-slit synergetic resonant effect was studied that can
achieve broadband sound absorption in a range betwen 500 Hz and 1150 Hz by using a nested
doll supercell with a thickness of only 44.1 mm (the thickness being one sixteenth of the
wavelength). The basic unit of the improved micro-slit absorber (IMSA), made by designing the slit of the micro-slit absorber as a type of step and locating it at the edge of the surface panel, is
proposed for sound absorption at lower frequencies. The improved step slit can not only change the structure’s impedance to match the medium of air at a lower frequency, but can also guide sound waves into the slit and increase the air velocity step by step, which results in a strong
friction loss in the lower micro-slit. On this basis, a nested doll supercell with eight integrated
parallel IMSAs was designed and tested, and was able to achieve sound absorption in a range
between 500 Hz and 1150 Hz. In addition, the bandwidth was further broadened (to between
330 Hz and 1150 Hz) by adding four additional IMSAs to the previous supercell, while the
surface area of the panel only increased by about 20%. This work highlighted the potentially
extensive application of broadband noise reduction due to its depth, i.e. subwavelength
thickness, and the relatively small surface area of the panel. - Co-author:Liu, Hongxing; Wu, Jiu Hui; Li, Bing; Lei, Yunzhong; Ma, Fuyin
- Volume:Vol.53, No.49, 2020
- Page Number:495301 (10pp)
- Translation or Not:No
- Date of Publication:2020-08-26
