Metamaterial foam core sandwich panel designed to attenuate the mass-spring-mass resonance sound transmission loss dip
Metamaterial foam core sandwich panel designed to attenuate the mass-spring-mass resonance sound transmission loss dip
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DOI：
10.1016/j.ymssp.2020.106624
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发表时间：
2020-05
影响因子：
8.4
通讯作者：
Noé Geraldo Rocha de Melo Filho;C. Claeys;E. Deckers;W. Desmet
中科院分区：
文献类型：
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作者：
Noé Geraldo Rocha de Melo Filho;C. Claeys;E. Deckers;W. Desmet
泡沫芯的双层隔板在质量-弹簧-质量共振频率下的声音传输损失较差。本文考虑使用振声共振超材料来提高该共振频率区域的隔声性能，同时只给双面板增加8%的质量，从而保持其轻量化特性。在设计超材料时，通过有限元单元分析计算色散曲线来预测止阻带的频率区域。利用Heckl模型结合色散曲线分析所得的超材料等效动态质量，对阻带效应导致的声传输损失进行了预测。这种方法允许考虑复杂的谐振腔几何形状和宿主面板中的局部反应材料夹层。实现了所设计的超材料双面板，其实验测量的插入损耗在目标频率区域内超过了裸双面板和等效质量添加双面板的插入损耗。预测的绝缘与实测性能吻合较好，验证了所提方法的有效性。
Double panel partitions with a foam core suffer a poor sound transmission loss at their mass-spring-mass resonance frequency. This paper considers the use of vibro-acoustic resonant metamaterials to improve the acoustic insulation performance at the frequency region of this resonance while adding only 8% of mass to the double panel, hence maintaining its lightweight characteristics. To design the metamaterial, dispersion curves are calculated through finite element unit cell analysis to predict the stop band frequency region. The resulting sound transmission loss due to the stop band effect is predicted using Heckl’s model combined with the equivalent dynamic mass of the metamaterial, which is obtained from the dispersion curves analysis. This method allows taking into consideration complex resonator geometries and locally reacting material interlayers in the hosting panel. The designed metamaterial double panel is realised, and its experimentally measured insertion loss surpasses the insertion loss of the bare and equivalent mass addition double panels in the targeted frequency region. The predicted insulation agrees well with the measured performance, validating the proposed method.