Finite Element Analysis of Honeycomb Membrane-Type Acoustic Metamaterial
Keywords:
Acoustic metamaterial, honeycomb structure, membrane, transmission loss, lightweight materialAbstract
In this paper, a honeycomb membrane-type acoustic metamaterial made of a honeycomb structure with embedded membrane layers is investigated using the finite element method. This lightweight material presents excellent transmission loss (TL) at low frequency. The impacts of the membrane material properties and of the honeycomb cell size on the transmission loss are studied numerically. It is shown that the TL increases over a large frequency band when the honeycomb cell size decreases while the displacement magnitude of the membrane is reduced and the mode shape is affected. The influence of the membrane thickness on the TL and displacement magnitude and mode shape at different frequencies is presented. It is observed that the TL presents multiple resonant peaks as the thickness of the membranes is reduced. An improvement of the TL is observed around the anti-resonant frequencies by increasing the damping loss factor of the membrane, which causes a reduction of the resonant displacement magnitude and TL peaks amplitude. Honeycomb structures with two and three embedded membrane layers are analyzed numerically and the effects of the number of membrane layers and of the thickness of the air gap between membranes are illustrated. The investigated metamaterial can be useful in many noise control engineering applications.
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