Grating-like anechoic layer for broadband underwater sound absorption

IF 3.4 Q1 ENGINEERING, MECHANICAL 国际机械系统动力学学报(英文) Pub Date : 2022-10-18 DOI:10.1002/msd2.12053
Chenlei Yu, Mingyu Duan, Wei He, Xin Chen, Fengxian Xin, Tian J. Lu
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引用次数: 2

Abstract

To address the challenging task of effective sound absorption in the low and broad frequency band for underwater structures, we propose a novel grating-like anechoic layer by filling rubber blocks and an air backing layer into metallic grating. The metallic gratings are incorporated into the anechoic layer as a skeleton for enhanced viscoelastic dissipation by promoting shear deformation between rubber and metal plates. The introduction of an air backing layer releases the bottom constraint of the rubber, thus intensifying its deformation under acoustic excitation. Based on the homogenization method and the transfer matrix method, a theoretical model is developed to evaluate the sound absorption performance of the proposed anechoic layer, which is validated against finite element simulation results. It is demonstrated that a sound absorption coefficient of the grating-like anechoic layer of 0.8 can be achieved in the frequency range of 1294–10 000 Hz. Given the importance of sound absorption at varying frequencies, the weighted average method is subsequently used to comprehensively evaluate the performance of the anechoic layer. Then, with structural density taken into consideration, an integrated index is proposed to further evaluate the acoustic properties of the proposed anechoic layer. Finally, the backing conditions and the boundary conditions of finite-size structures are discussed. The results provide helpful theoretical guidance for designing novel acoustic metamaterials with broadband low-frequency underwater sound absorption.

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宽带水声吸收的栅格状消声层
为了解决水下结构在低频段和宽频段有效吸声的难题,我们提出了一种新型的类似光栅的消声层,通过在金属光栅中填充橡胶块和空气支撑层。金属光栅作为骨架纳入消声层,通过促进橡胶和金属板之间的剪切变形来增强粘弹性耗散。空气衬垫层的引入解除了橡胶的底部约束,从而加剧了其在声激励下的变形。基于均匀化法和传递矩阵法,建立了消声层吸声性能的理论模型,并与有限元仿真结果进行了对比验证。结果表明,在1294 ~ 10000hz的频率范围内,类光栅消声层的吸声系数为0.8。考虑到不同频率吸声的重要性,随后采用加权平均法对消声层的性能进行综合评价。然后,在考虑结构密度的情况下,提出了一种综合指标来进一步评价所提出的消声层的声学特性。最后讨论了有限尺寸结构的支撑条件和边界条件。研究结果为设计具有宽带低频吸声特性的新型声学超材料提供了有益的理论指导。
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