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Lookup NU author(s): Dr Pooya Sareh
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© 2024 Institution of Structural EngineersVibration isolators are widely used to mitigate undesirable vibrations in engineering systems and structures, but low-frequency vibration isolation remains a challenge. Origami-inspired structures, with their tunable stiffness and transformative capabilities, offer potential for vibration isolation. Inspired by conical Kresling origami, this study proposes a quasi-zero-stiffness vibration isolation system. Static analysis of the origami structure reveals that the system exhibits near-zero dynamic stiffness at the static equilibrium position, while maintaining static stiffness during the load-bearing process. The amplitude-frequency characteristic formula and vibration transmissibility formula are derived using the harmonic balance method. The effects of varying damping ratios and excitation amplitudes on the amplitude-frequency and transmissibility curves are examined. It is shown that the vibration isolation range increases with the number of layers. A comparison of the system's response to harmonic vibrations under different compressive deformations highlights the effectiveness of the origami quasi-zero-stiffness system as a vibration attenuator. Compared to existing quasi-zero-stiffness dampers, the origami-inspired system features a wider isolation frequency band, a lower initial isolation frequency, and reduced vibration transmissibility, demonstrating superior isolation performance, particularly at low frequencies.
Author(s): Zhou H, Gao J, Chen Y, Shen Z, Lv H, Sareh P
Publication type: Article
Publication status: Published
Journal: Structures
Year: 2024
Volume: 69
Print publication date: 01/11/2024
Online publication date: 26/09/2024
Acceptance date: 16/09/2024
ISSN (electronic): 2352-0124
Publisher: Elsevier Ltd
URL: https://doi.org/10.1016/j.istruc.2024.107315
DOI: 10.1016/j.istruc.2024.107315
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