Vibro-acoustic Helmholtz absorber with soft wall for broadband sound absorption

IF 7.1 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences Pub Date : 2025-02-18 DOI:10.1016/j.ijmecsci.2025.110083

Xiaoli Liu , Jiu Hui Wu , Jiamin Niu , Wei Li , Chongrui Liu

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引用次数: 0

Abstract

Aiming at the issue of low-frequency broadband sound absorption, integrating soft materials into acoustic metamaterials offers a promising method to enhance absorption performance. In this paper, a soft-wall vibro-acoustic Helmholtz metamaterial (SVHM) is presented to achieve low-frequency broadband sound absorption, consisting of two parallel Helmholtz resonators (HRs) and a shared vibro-acoustic plate as the soft boundary. Introducing the soft plate not only couples its multiple vibration modes with the neck hole generating additional resonance peaks, but also enhances the energy dissipation of the original HR structure, thereby improving the sound absorption performance of the SVHM structure compared to HRs of the same thickness. A sample with an average absorption coefficient of 0.83 in the range of 306 Hz - 1188 Hz was designed, and the absorption bandwidth was broadened compared with the corresponding rigid sample of the same size. This SVHM structure could have potential applications in architectural acoustics, mechanical equipment, and transportation noise reduction.

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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.