Qi, Zhuoyuan, Pan, Diankun, Hu, Kai and Wu, Zhangming  ORCID: https://orcid.org/0000-0001-7100-3282
2027.
Quasi-zero stiffness metastructure with continuous cosine-shaped beam for vibration isolation.
Thin-Walled Structures
232
(Part 1)
, 115696.
10.1016/j.tws.2026.115696
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Abstract
In this paper, a monolithic quasi-zero stiffness beam with a continuous cosine shape is proposed for the construction of QZS metastructures for low-frequency vibration isolation. Owing to its simple continuous configuration, the QZS characteristic can be conveniently controlled and adjusted by geometric parameters. The metastructure based on the proposed QZS beam exhibits outstanding flexible designability and enables a broader range of material selections. A chained beam constraint method is first employed in conjunction with the finite element model and experimental validation to derive the existence of the QZS characteristic, and the variation trend of QZS characteristics is correlated with the critical design parameters for the QZS unit. Subsequently, this paper explores the designability of metastructures via the combination of QZS units and modular design to demonstrate the potential for satisfying customized requirements. Then, the vibration isolation of the proposed QZS metastructures is confirmed by a dynamic model, the finite element method, and experiments. When the payload mass matches the QZS plateau, the onset isolation frequency is much lower than that under the conditions of positive stiffness status. Furthermore, due to the monolithic configuration of the proposed QZS unit, carbon fiber reinforced polymer prepreg is explored for its fabrication through a mold-pressing process to overcome the strength and stability limitations of additive manufacturing materials. The nonlinear isolation performance is investigated under a relatively high acceleration level, and this composite QZS unit can achieve an onset isolation frequency below 5 Hz at an acceleration of 0.15 g. This work exhibits the potential of the QZS metastructure by employing the composite material for advanced lightweight low-frequency vibration isolation applications.
| Item Type: | Article |
|---|---|
| Date Type: | Publication |
| Status: | Published |
| Schools: | Schools > Engineering |
| Additional Information: | RRS applied. |
| Publisher: | Elsevier |
| ISSN: | 0263-8231 |
| Date of First Compliant Deposit: | 6 October 2026 |
| Date of Acceptance: | 17 September 2026 |
| Last Modified: | 06 Oct 2026 15:30 |
| URI: | https://orca.cardiff.ac.uk/id/eprint/190042 |
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