用于控制宽带结构声响应的非厄米集肤压电元梁

IF 3.4 2区物理与天体物理 Q1 ACOUSTICS

Applied Acoustics Pub Date : 2025-08-27 DOI:10.1016/j.apacoust.2025.111020

Jiawei Mao, Shuai Liu, Shoubo Dai, Zewei Wang, Penglin Gao, Yegao Qu

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引用次数: 0

摘要

提出了一种安装单向控制电路的压电元梁，用于控制结构振动和宽带范围内的辐射声波。元束表现出非厄米集肤效应，将能量定位到一个特定的边界，有利于振动和声辐射波的控制。建立了元光束在无界流体中复域色散图的解析模型，揭示了元光束的非互易波传输特性和皮肤边界控制机理。实验证实了在较宽的频率范围内存在能量局部化和趋肤效应。研究发现，压电元梁的单向控制电路可以扩大元梁的带隙。通过结合通带和带隙，可以实现波束的宽带振动衰减。在无界流体中，元梁的结构声响应通过控制速率调谐进行调制。这允许特定的皮肤边界定位和平均声辐射减少约40分贝在600赫兹到2000赫兹的宽频率范围内。

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A piezoelectric meta-beam with non-Hermitian skin effect for controlling broadband structural–acoustic responses

A piezoelectric meta-beam equipped with unidirectional control circuits is proposed to control structural vibration and radiated sound waves in a broadband frequency range. The meta-beam exhibits non-Hermitian skin effect, which localizes energy to a specific boundary, facilitating the control of vibrations and sound radiation waves. An analytical model is developed for analyzing the complex-domain dispersion diagram of the meta-beam in unbounded fluid, and the non-reciprocal wave transmission characteristics and skin-boundary control mechanisms of the beam are revealed. Experiment is conducted to confirm the presence of energy localization and skin effect for vibration attenuation across a broad frequency range. It is found that the unidirectional control circuits of the piezoelectric meta-beam can expand the bandgaps of the meta-beam. This enables broadband vibration attenuation of the beam by combining the passband and bandgap. The structural–acoustic responses of the meta-beam in unbounded fluid are modulated through control rate tuning. This allows for specific skin-boundary localization and an average sound radiation reduction about 40 dB over a broad frequency ranging from 600 Hz to 2000 Hz.

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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.