Effects of Geometrical Factors on Sound SilencingBehavior of Mass Attached Membrane-Type Acoustic Metamaterials

Membrane-type acoustic metamaterials have attracted significant attention in recent years due to their capacity to generate low-frequency band gaps. To date, numerous analytical and nu-merical approaches have been developed to study and evaluate the acoustic performance of this type of metamaterial toward improving their sound silencing behavior. This paper exam-ines different geometrical factors of the mass-attached membrane, including the thickness and pretension of the membrane, the weight, and the radius of the attached mass by using the point-wise matching method and a coupled analytical vibroacoustic analysis to determine the trans-mission loss of the metamaterial. We investigate how these geometrical factors contribute to sound silencing. Additionally, the full-wave simulation of these mass-attached membranes is carried out to validate the results numerically. The paper herein provides insight into how the geometrical parameters of mass-attached membranes can be tuned to broaden the silencing bandwidth and lower the frequency of the transmission loss peak in order to control low-fre-quency noise.

کلیدواژه ها:

Membrane-type acoustic metamaterial ، frequency bandwidth ، low-frequency re-gime ، transmission loss ، anti-resonance frequency