Syndiotactic chiral metamaterial absorber for low-frequency broadband vibration reduction

IF 7.1 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences Pub Date : 2025-05-27 DOI:10.1016/j.ijmecsci.2025.110435

Shenghao Xu, Kyunglae Gu, Junhong Park

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引用次数: 0

Abstract

The compression-twist coupling effect of chiral metamaterials provides new insights into the development of broadband absorbers. This study proposes a novel syndiotactic chiral metamaterial absorber (SCMA), which combines a syndiotactic chiral metamaterial frame with twisted beams. The proposed SCMA leverages the coupled vibration and inertial amplification effects, which allows to suppress the low-frequency broadband vibration. By adjusting the twist angles of the beams, the vibration suppression band and the maximum amplitude can be optimized. A three-dimensional (3D) elastic wave model and a discrete oscillator model are then developed to study the modal characteristics and damping mechanism of the SCMA. Afterwards, the impacts of the ligament angles and the slenderness ratio of the chiral metamaterial frame on the vibration suppression bandwidth are systematically evaluated. The obtained results show that, compared with conventional linear vibration absorbers (LVA), the SCMA reduces the amplitude by 24.8 % and expands the vibration suppression bandwidth by a factor of 10. The experimental results are consistent with the predictions of the theoretical models. The high damping performance and significantly broadened attenuation bandwidth of the proposed SCMA provide a high potential for enhancing the structural integrity of machinery.

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用于低频宽带减振的共规手性超材料吸收体

手性超材料的压扭耦合效应为宽带吸收材料的研究提供了新的思路。本研究提出了一种新型的共规手性超材料吸收材料（SCMA），它将共规手性超材料框架与扭曲梁相结合。所提出的SCMA利用耦合振动和惯性放大效应，可以抑制低频宽带振动。通过调整梁的扭转角，可以优化梁的抑振带和最大振幅。然后建立了三维弹性波模型和离散振子模型，研究了SCMA的模态特性和阻尼机理。然后，系统地评价了韧带角度和手性超材料框架长细比对减振带宽的影响。结果表明，与传统的线性吸振器（LVA）相比，SCMA减振幅度降低了24.8%，减振带宽扩大了10倍。实验结果与理论模型的预测一致。所提出的SCMA具有高阻尼性能和显著拓宽的衰减带宽，为提高机械结构完整性提供了很高的潜力。

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

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.