Rhombus-type magnetic-levitation structure for low-frequency vibration isolation

Yu, Ning, Fei, Xiangyi, Sun, Hao, Wu, Zhangming ORCID: https://orcid.org/0000-0001-7100-3282 and Yan, Bo 2025. Rhombus-type magnetic-levitation structure for low-frequency vibration isolation. Mechanical Systems and Signal Processing 225 , 112289. 10.1016/j.ymssp.2024.112289 Item availability restricted.

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Abstract

This paper presents a rhombus-type magnetic-levitation structure (RMLS) to achieve effective low-frequency vibration isolation performance. The design philosophy behind the proposed RMLS integrates the motion of permanent magnets (PMs) with geometric nonlinearities to achieve high-static-stiffness-and-low-dynamic stiffness. A theoretical model for RMLS is developed, and the displacement transmissibility is determined using the harmonic balance method. Both numerical simulations and experimental verifications are conducted to examine the effects of various factors on vibration isolation performance, including the initial angle, the configuration and the parameters of PMs, the length of rods and the equilibrium position of RMLS. The experimental results demonstrate that the proposed RMLS exhibits lower peak transmissibility and isolation frequency compared to an equivalent rhombic-type vibration isolator. The RMLS offers adjustable quasi-zero stiffness (QZS) region, which effectively broadens the range of vibration isolation frequencies. Low-frequency vibration isolation performance can be further improved by reducing the distance between the fixed PMs and adjusting the initial angle of the rhombic structure. Additionally, the maglev structure enhances the load-bearing capacity of RMLS. Under a larger load, the position of the PMs can be adjusted to maintain a wider QZS region, ensuring effective vibration isolation. This study provides a valuable guidance for the design of low-frequency QZS vibration isolators.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Engineering
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) T Technology > TJ Mechanical engineering and machinery
Publisher:	Elsevier
ISSN:	0888-3270
Date of First Compliant Deposit:	22 January 2025
Date of Acceptance:	28 December 2024
Last Modified:	06 Feb 2025 10:45
URI:	https://orca.cardiff.ac.uk/id/eprint/175496

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