Papers
Release Time: 2025-04-30Hits:
- Date:2025-04-30
- Title of Paper:Expanding the strong absorption band by impedance matched mosquito-coil like acoustic metamaterials
- Journal:Review of Scientific Instruments
- Summary:A mosquito-coil like acoustic artificial structure consisting of a spiral channel and a
perforated plate with excellent impedance matching is proposed, which can realize strong sound
absorption within a certain frequency range. Due to the impedance of single-hole structure to
match difficultly with that of the sound propagation medium, the sound absorption should be poor.
For overcome this shortcoming caused by the mismatched impedance, some multi-hole
microstructures are designed. Moreover, for single-chamber labyrinth can only achieve
single-frequency perfect sound absorption, a labyrinthine channel is divided into several chambers
with each length distributing by an arithmetic progression gradient. The sound absorption
bandwidth can be extended by synergetic coupling resonance among multiple chambers. By
selecting different structural parameters including the number of holes, the width of labyrinthine
channel, and the depth of labyrinthine channel, sound absorption of these mosquito-coil like
structures are investigated. The results suggest that the multi-holes structures are helpful in
improving the impedance matching, while the synergetic coupling resonance among multiple
chambers ensures that the sound absorption coefficient of the structure can be maintained at a high
level within a certain frequency range. In addition, some mosquito-coil like sound absorption
structures are fabricated by 3D printing, then the sound absorptions under vertical sound incident
condition are measured, and the strong sound absorption ability in a wide band is experimentally
demonstrated. Finally, it is proposed that a method for adjusting the sound absorptions by
proportionally zooming in or out the structure, which the sound absorptions of the acoustic
structure can be effectively shifted to lower or higher frequencies. - Co-author:Mingming Hou, J. Wu, Shaokun Yang, Jiu Hui Wu, Fuyin Ma
- Volume:Vol. 91, No. 2, 2020
- Page Number:025102 (7 Pages)
- Translation or Not:No
- Date of Publication:2020-02-06
