Acoustic metamaterials with multi-bandgap mechanism fusion and their low-frequency broadband Vibration suppression characteristics

被引：0
作者：
Sun, Ping [1 ]
Xu, Siqi [1 ]
Wang, Xiaole [1 ]
机构：
[1] College of Sensing Science and Engineering, Shanghai Jiao Tong University, Shanghai
来源：
Zhendong yu Chongji/Journal of Vibration and Shock | 2024年 / 43卷 / 23期
关键词：
acoustic metamaterial; bandgap; elastic wave; Vibration suppression;
D O I：
10.13465/j.cnki.jvs.2024.23.028
中图分类号：
学科分类号：
摘要：
Compact and lightweight low-frequency wide bandgap acoustic metamaterials have broad application prospects in the field of elastic wave control. Here, a basic configuration of acoustic metamaterial with structural functional reuse was proposed, it could integrate Bragg scattering bandgap, local resonance bandgap and inertial amplification bandgap, and have rieh bandgap control DOFs. A finite element model for energy band calculation of infinite sized acoustic metamaterial plate was established, and its bandgap characteristics were predicted using numerical examples. Acoustic metamaterial samples were prepared and attached to a finite sized flat aluminum plate. The Vibration transfer funetion was obtained using the impact hammer method to verify the correetness of bandgap calculation results and measure the low-frequency broadband Vibration suppression effect. The test results showed that the proposed acoustic metamaterial can attenuate structural Vibration of flat aluminum plate by an average of 21 dB and near-field acoustic radiation by 6 dB within a wide frequency ränge of 100-1 000 Hz; moreover, for aluminum plate struetures with large curvature, the proposed acoustic metamaterial is not only easy to install, but also effectively has the low-frequency broadband Vibration suppression effect; in addition, parametric analyses reveal effects of cantilever stiffness and end mass of the base local resonance mechanism as well as additional mass and inertial amplification angle of the inertial amplification mechanism on bandgap characteristics; this study can provide ideas and methods for development of low-frequency wide bandgap acoustic metamaterials. © 2024 Chinese Vibration Engineering Society. All rights reserved.
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页码：250 / 259
页数：9
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