Large Band Gaps of Petal-Shaped Acoustic Metamaterials Based on Local Resonance
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To get stronger coupling strength of the Lame wave and local resonant eigenmodes, to widen band gaps (BGs) of acoustic metamaterials and to clearly explain the formation mechanism of wider BGs.
Complete band gaps (BGs) and the formation mechanism of them for the proposed unit cell (UC) with petal-shaped components are calculated and analyzed by numerical simulations. The vibration modes of band-gap edge are calculated and analyzed by finite element method. Finally, an experimental test is done to support simulation result.
Compared to UC without petal-shaped components, the petal-shaped UC can generate wider band gaps (BGs) below 400 Hz. Owing to the special geometry of proposed UC, the stronger coupling strength of the Lame wave and local resonant eigenmodes is realized. The proposed UC is demonstrated to possess a maximal relative bandwidth 95.4%.
Outstanding property of BGs of the proposed UC is mainly due to stronger local resonance associated with petal-shaped components.
KeywordsAcoustic metamaterials Local resonance Band gap Transmission loss
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