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Large Band Gaps of Petal-Shaped Acoustic Metamaterials Based on Local Resonance

  • Lin ChenEmail author
  • Yu-Sheng Bian
  • Rong Zhou
Article
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Abstract

Aims

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.

Method

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.

Results

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%.

Conclusions

Outstanding property of BGs of the proposed UC is mainly due to stronger local resonance associated with petal-shaped components.

Keywords

Acoustic metamaterials Local resonance Band gap Transmission loss 

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© KrishteleMaging Solutions Private Limited 2019

Authors and Affiliations

  1. 1.Faculty of Civil and Mechanics EngineeringJiangsu UniversityZhenjiangPeople’s Republic of China
  2. 2.Department of Engineering Science and MechanicsThe Pennsylvania State University ParkCentre CountyUSA

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