Perforated membrane-type acoustic metamaterials

Journal
Physics letters  
Volume
381
Issue
16
Start Page
1457
End Page
1462
Citation
Physics Letters, Section A: General, Atomic and Solid State Physics 16 (381): 1457-1462 (2017-04-25)
Publisher DOI
10.1016/j.physleta.2017.02.036
Scopus ID
2-s2.0-85014579250
Publisher
North-Holland Publ.
This letter introduces a modified design of membrane-type acoustic metamaterials (MAMs) with a ring mass and a perforation so that an airflow through the membrane is enabled. Simplified analytical investigations of the perforated MAM (PMAM) indicate that the perforation introduces a second anti-resonance, where the effective surface mass density of the PMAM is much higher than the static value. The theoretical results are validated using impedance tube measurements, indicating good agreement between the theoretical predictions and the measured data. The anti-resonances yield high low-frequency sound transmission loss values with peak values over 25 dB higher than the corresponding mass-law.
Subjects
Acoustic
Effective mass
Membrane
Metamaterial
Perforated
Transmission loss
DDC Class
530: Physik
620: Ingenieurwissenschaften
More Funding Information
This work was supported by the Federal Ministry for Economic Affairs and Energy [grant number 20K1102D].