Vortex-shaped acoustic black holes in rotational arrangement for low-frequency vibration suppression

IF 3.4 2区物理与天体物理 Q1 ACOUSTICS

Applied Acoustics Pub Date : 2025-06-18 DOI:10.1016/j.apacoust.2025.110862

Taehwan Son, Seongmin Park, Wonju Jeon

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引用次数: 0

Abstract

We propose a new design of two-dimensional acoustic black hole (2D ABH) aimed at vibration suppression across low and broadband frequencies. The proposed 2D ABH occupies a circular installation space, with multiple vortex-shaped ABHs arranged rotationally along the circumference, exhibiting a whirlpool-like configuration when viewed from above. Each vortex-shaped ABH is formed by coiling a width-tapered straight ABH along a newly designed spiral profile, intended to accommodate a long ABH for a low cut-on frequency and to guide flexural waves from a host structure to the ABH tip. The proposed 2D ABH is embedded within a plate and suppresses broadband vibrations, reducing the surface-averaged mobility by up to 20 dB in the 60–2000 Hz frequency range. Compared to a conventional 2D ABH with a cut-on frequency of around 60 Hz, the proposed ABH requires less than 2 % of the installation area. By breaking rotational symmetry in the arrangement of the proposed vortex-shaped ABHs, we could further reduce structural vibrations in the plate compared to a rotationally symmetric arrangement.

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旋涡状声波黑洞的旋转布置对低频振动的抑制

我们提出了一种新的二维声黑洞（2D ABH）设计，旨在抑制低频和宽带的振动。设计的2D ABH占据了一个圆形的安装空间，多个漩涡形状的ABH沿着圆周旋转排列，从上面看时呈现出漩涡状的结构。每个涡形ABH都是通过沿新设计的螺旋轮廓盘绕宽度变细的直ABH形成的，旨在容纳低切断频率的长ABH，并将弯曲波从主机结构引导到ABH尖端。所提出的2D ABH嵌入板内，抑制宽带振动，在60-2000 Hz频率范围内将表面平均迁移率降低高达20 dB。与传统的2D ABH（开关频率约为60hz）相比，该ABH只需要不到2%的安装面积。通过打破旋涡形ABHs排列中的旋转对称性，与旋转对称排列相比，我们可以进一步减少板中的结构振动。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Applied Acoustics 物理-声学

CiteScore

7.40

自引率

11.80%

发文量

618

审稿时长

7.5 months

期刊介绍： Since its launch in 1968, Applied Acoustics has been publishing high quality research papers providing state-of-the-art coverage of research findings for engineers and scientists involved in applications of acoustics in the widest sense. Applied Acoustics looks not only at recent developments in the understanding of acoustics but also at ways of exploiting that understanding. The Journal aims to encourage the exchange of practical experience through publication and in so doing creates a fund of technological information that can be used for solving related problems. The presentation of information in graphical or tabular form is especially encouraged. If a report of a mathematical development is a necessary part of a paper it is important to ensure that it is there only as an integral part of a practical solution to a problem and is supported by data. Applied Acoustics encourages the exchange of practical experience in the following ways: • Complete Papers • Short Technical Notes • Review Articles; and thereby provides a wealth of technological information that can be used to solve related problems. Manuscripts that address all fields of applications of acoustics ranging from medicine and NDT to the environment and buildings are welcome.