噪声与振动控制2018，Vol.38Issue(z1)：35-40,6.DOI:10.3969/j.issn.1006-1355.2018.Z1.007
声学超材料板的弯曲波带隙与减振降噪特性
Flexural Wave Band Gaps and Vibration Attenuation Characteristics of Acoustic Metamaterial Plates
摘要
Abstract
The energy band structure diagram of an acoustic metamaterial plate with a double cylindrical local resonance structure was calculated by the combination of finite element method and wave propagation theory of periodic structures. The influence of the lattice constant variation on the band gaps of the metamaterial plate was analyzed. It was found that the change of lattice constants can affect the vibration coupling between substrate and the cylinders, which have a significant influence on the band gaps. Then, through the comparison of results of different examples, the regulation of influence of lattice constants on the band gaps was obtained with or without considering the additional mass ratio of the local resonance structures. The study showed that selection of a moderate lattice constant can increase the normalized width of the band gaps. In addition, the vibration and acoustic radiation characteristics of the metamaterial plate under the force excitation were calculated. The results indicated that the metamaterial plate has a good performance on low frequency broadband vibration attenuation and noise reduction in the band gaps. The paper has also provided a useful reference for the design of low frequency broadband vibration and noise reduction based on bandgap theory.关键词
振动与波/声学超材料/低频带隙/声辐射/减振降噪Key words
acoustics/acoustic metamaterials/low frequency band gap/acoustic radiation/vibration attenuation and noise reduction分类
通用工业技术引用本文复制引用
李寅,肖勇..声学超材料板的弯曲波带隙与减振降噪特性[J].噪声与振动控制,2018,38(z1):35-40,6.基金项目
装备预研领域基金资助项目(61402100105) （61402100105）
