Low frequency wide band sound absorption performance of asymmetric type acoustic metamaterials

被引：0
|
作者：
Niu J. [1 ,2 ]
Wu J. [2 ]
机构：
[1] School of Science, Xi'an Jiaotong University, Xi'an
[2] State Key Lab of Mechanical Structural Strength and Vibration, Xi'an Jiaotong University, Xi'an
来源：
Zhendong yu Chongji/Journal of Vibration and Shock | 2018年 / 37卷 / 19期
关键词：
Acoustic metamaterials; Asymmetry; Low frequency; Wide band;
D O I：
10.13465/j.cnki.jvs.2018.19.007
中图分类号：
学科分类号：
摘要：
Low frequency sound wave control is a challenging subject, and membrane-type acoustic metamaterials for current hot research can deal with it. However, the sound-absorbing resonant frequency's dropping is at the expense of resonant bandwidth. Here, the sound-absorbing membrane-type acoustic metamaterials were taken as the study object to study the effects of a resonance mass's asymmetry on structure's low frequency wide band sound-absorbing performance. The results showed that the sound absorption performance of a whole structure significantly increases under structural asymmetric mode, and the sound absorption bandwidth is widened; the frequencies for zero equivalent mass density are corresponding to peak values of sound absorption coefficient; a structure with asymmetric modes has higher elastic strain energy than that with symmetry modes does within a full frequency range; each sound absorption peak frequency caused by structure's asymmetry is adjusted by the mass of a resonant block and reveals a certain law; according to this law, a sound-absorbing structure is designed to achieve the sound absorption effect with low frequency and wide band through numerical calculation. This study provided a theoretical guide for improving low frequency wide band sound-absorbing performance of membrane-type acoustic metamaterials. © 2018, Editorial Office of Journal of Vibration and Shock. All right reserved.
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页码：45 / 49and68
页数：4923
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