Multifunctional hybrid metastructure with a combination of flower-shaped Helmholtz resonator and spiral labyrinth: Synergy enhancement in broadband sound absorption and high energy absorption performance

IF 3.4 2区物理与天体物理 Q1 ACOUSTICS

Applied Acoustics Pub Date : 2025-03-18 DOI:10.1016/j.apacoust.2025.110684

Weifan Kong , Tao Fu , Tao Liu , Jinxiang Fang , Sen Wang , Chao Yang , Miao Zhao

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引用次数: 0

Abstract

The increase of the running speed of high-speed trains is accompanied by the continuous increase of the internal noise of the carriage, and the total noise reduction capacity of the sandwich structure, which is the main component of the carriage wall, is limited under the constraints of space dimension and size, which poses a new challenge to the acoustic performance design of the sandwich structure. Based on that, this paper proposes a novel compact composite structure, which consists of a flower-shaped Helmholtz resonator incorporating an embedded tube, a microperforated plate, and a spiral-shaped labyrinth sound-absorbing structure from top to bottom. Simulations of the structure were performed utilizing the finite element analysis software COMSOL, and the results were verified through standing wave tube sound absorption tests. A strong alignment was noted between the experimental outcomes and the simulation results. The results reveal that the average sound absorption coefficient of the structure surpasses 0.95 within the frequency band of 394 Hz to 548 Hz, achieving nearly perfect sound wave absorption. At the resonance frequency of 394 Hz, the peak absorption coefficient attains 0.981369, despite the structure’s thickness being only one-fifteenth of the wavelength corresponding to the absorption peak frequency, highlighting its distinctive deep-subwavelength properties. Even when the structure’s height is reduced to 60 mm, it maintains a wide sound absorption bandwidth, featuring a bandwidth ratio of 70 % where the sound absorption coefficient exceeds 0.5. The structure exemplifies deep-subwavelength properties by effectively managing large wavelengths despite its small size. Furthermore, the energy absorption characteristics of the composite structure are analyzed. It is found that the composite structure has excellent energy absorption characteristics and sound absorption performance. This study proposes a lightweight metastructure with exceptional acoustic performance, it has potential application value in the skin structure of high-speed trains and other transportation equipment.

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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.