Low-frequency vibration suppression of meta-beam with softening nonlinearity.

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Bibliographic Details
Title:	Low-frequency vibration suppression of meta-beam with softening nonlinearity.
Authors:	Zhang, Weixing¹ (AUTHOR), Yang, Dongshuo¹ (AUTHOR), Guo, Xiangying¹ (AUTHOR) eagle2008guo@yeah.net
Source:	Applied Mathematics & Mechanics. Jun2025, Vol. 46 Issue 6, p1011-1028. 18p.
Subjects:	Hamilton's principle function, Band gaps, Modal analysis, Galerkin methods, Numerical calculations
Abstract:	In order to obtain a lower frequency band gap, this paper proposes a novel locally resonant meta-beam incorporating a softening nonlinear factor. An improved cam-roller structure is designed in this meta-beam to achieve the softening nonlinear stiffness of the local oscillators. Firstly, based on Hamilton's principle and the Galerkin method, the control equations for the coupled system are established. The theoretical band gap boundary is then derived with the modal analysis method. The theoretical results reveal that the band gap of the meta-beam shifts towards lower frequencies due to the presence of a softening nonlinear factor, distinguishing it from both linear metamaterials and those with hardening nonlinear characteristics. Then, the vibration attenuation characteristics of a finite size meta-beam are investigated through numerical calculation, and are verified by the theoretical results. Furthermore, parameter studies indicate that the reasonable design of the local oscillator parameters based on lightweight principles helps to achieve further broadband and efficient vibration reduction in the low-frequency region. Finally, a prototype of the meta-beam is fabricated and assembled, and the formations of the low-frequency band gap and the amplitude-induced band gap phenomenon are verified through experiments. [ABSTRACT FROM AUTHOR]
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Database:	Engineering Source

Description
Abstract:	In order to obtain a lower frequency band gap, this paper proposes a novel locally resonant meta-beam incorporating a softening nonlinear factor. An improved cam-roller structure is designed in this meta-beam to achieve the softening nonlinear stiffness of the local oscillators. Firstly, based on Hamilton's principle and the Galerkin method, the control equations for the coupled system are established. The theoretical band gap boundary is then derived with the modal analysis method. The theoretical results reveal that the band gap of the meta-beam shifts towards lower frequencies due to the presence of a softening nonlinear factor, distinguishing it from both linear metamaterials and those with hardening nonlinear characteristics. Then, the vibration attenuation characteristics of a finite size meta-beam are investigated through numerical calculation, and are verified by the theoretical results. Furthermore, parameter studies indicate that the reasonable design of the local oscillator parameters based on lightweight principles helps to achieve further broadband and efficient vibration reduction in the low-frequency region. Finally, a prototype of the meta-beam is fabricated and assembled, and the formations of the low-frequency band gap and the amplitude-induced band gap phenomenon are verified through experiments. [ABSTRACT FROM AUTHOR]
ISSN:	02534827
DOI:	10.1007/s10483-025-3258-9