局域共振型瓣状声学超材料带隙特性研究

Study of Band Structure for Petal-shaped Acoustic Metamaterials

针对现有研究中声学超材料完全带隙和相对带隙较窄的问题,设计了一种局域共振机理的瓣型声学超材料,运用有限元计算和仿真方法研究了该薄膜型声学超材料的能带特性及其振型特性,研究表明瓣型声学超材料的带隙宽度是无瓣型声学超材料带隙宽度的16倍,其相对带隙可达60%。

This paper proposes a petal - shaped acoustic metamaterial structure to solve the relatively narrow complete band gaps and relative band gaps of previous studies. This metamaterial is based on local resonance. The band structures and vibration characteristics of the unit are calculated and analyzed by numerical simulations based on the finite element method. It is suggested that whole width of complete band gaps for the petal - shaped unit is more than 16 times that of the unit without petals, and the relative band gap is up to 60%.