Abstract
In this study, an acoustic metastructure, combined with a thin membrane and a rectangular cavity, was designed to reduce the noise of mechanical structures from 2000 Hz to 4000 Hz. Finite element method (FEM) analysis was performed through COMSOL multiphysics and the sound-absorbing structure was evaluated using the sound absorption coefficient from the 2-microphone method. Subsequently, the acoustic impedance of this metastructure was analyzed to explain the absorption mechanism of the thin film. The target frequency was controlled by carefully designing the size of the cavity to effectively reduce noise in a specific frequency region. Additionally, to determine the sound absorption effect of the thin film, the difference in the sound pressure level owing to the rectangular duct was measured.
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