Ultra-broadband acoustic metaliner for fan noise reduction

IF 9.4 1区工程技术 Q1 ENGINEERING, MECHANICAL International Journal of Mechanical Sciences Pub Date : 2025-04-02 DOI:10.1016/j.ijmecsci.2025.110173

Tongwei Lu , Chun Liu , Nengyin Wang, Chen Shao, Yong Li

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Abstract

Fan noise, characterized by its broadband nature and spatial constraints, poses a significant challenge in noise control. Traditional acoustic liners, typically local, do not sufficiently address resonance mode coupling, rendering them inadequate for modern engineering requirements. Moreover, anti-resonance effects among these modes further weaken their broadband noise attenuation capability. By contrast, nonlocal metasurface liners employ global resonance modulation, allowing precise control of resonance mode coupling for improved noise attenuation. In this paper, we introduce an ultrathin nonlocal acoustic metaliner, designed via a mode matching method, which offers global resonance modulation and effectively suppresses anti-resonance between resonance modes, thereby mitigating broadband fan noise. Operating between 1000–5000

Hz

, the metaliner achieves a deep sub-wavelength thickness of just 20

mm

(

\sim λ / 17

). Fan tests indicate a 2.4

dB

reduction in total sound pressure levels in all directions. This approach highlights the practical applications of acoustic metamaterials, broadening their utility and enhancing noise control engineering.

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用于风扇降噪的超宽带声学metaliner

风扇噪声具有宽带特性和空间限制，对噪声控制提出了重大挑战。传统的声学衬垫，通常是局部的，不能充分解决共振模式耦合，使其不适合现代工程要求。此外，这些模式之间的抗共振效应进一步削弱了它们的宽带噪声衰减能力。相比之下，非局部超表面衬垫采用全局共振调制，允许精确控制共振模式耦合，以改善噪声衰减。本文介绍了一种超薄的非局域声学metaliner，通过模式匹配方法设计，提供全局共振调制，有效抑制共振模式之间的抗共振，从而减轻宽带风扇噪声。在1000 - 5000hz之间工作，metaliner实现的深亚波长厚度仅为20mm （~ λ/17）。风扇测试表明，所有方向的总声压级降低了2.4 dB。这种方法突出了声学超材料的实际应用，拓宽了它们的用途，加强了噪声控制工程。

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来源期刊

International Journal of Mechanical Sciences 工程技术-工程：机械

CiteScore

12.80

自引率

17.80%

发文量

769

审稿时长

19 days

期刊介绍： The International Journal of Mechanical Sciences (IJMS) serves as a global platform for the publication and dissemination of original research that contributes to a deeper scientific understanding of the fundamental disciplines within mechanical, civil, and material engineering. The primary focus of IJMS is to showcase innovative and ground-breaking work that utilizes analytical and computational modeling techniques, such as Finite Element Method (FEM), Boundary Element Method (BEM), and mesh-free methods, among others. These modeling methods are applied to diverse fields including rigid-body mechanics (e.g., dynamics, vibration, stability), structural mechanics, metal forming, advanced materials (e.g., metals, composites, cellular, smart) behavior and applications, impact mechanics, strain localization, and other nonlinear effects (e.g., large deflections, plasticity, fracture). Additionally, IJMS covers the realms of fluid mechanics (both external and internal flows), tribology, thermodynamics, and materials processing. These subjects collectively form the core of the journal's content. In summary, IJMS provides a prestigious platform for researchers to present their original contributions, shedding light on analytical and computational modeling methods in various areas of mechanical engineering, as well as exploring the behavior and application of advanced materials, fluid mechanics, thermodynamics, and materials processing.