High Load-Bearing Quasi-Zero Stiffness Metamaterials for Vibration Isolation

This study presents a rotary quasi-zero stiffness (QZS) vibration isolation unit tailored for high load-bearing applications. The unit's performance is assessed through a combination of computational simulations and experimental validation, with a focus on its force–displacement characteristics and vibration isolation efficiency across a defined frequency range. Results indicate that the QZS unit provides excellent isolation in the operational direction, effectively covering 92.2% of the target frequency band (5–300 Hz). Within the range of 35–295 Hz, the vibration attenuation exceeds –20 dB, and the load-bearing ratio reaches as high as 72.27. The novelty of this work lies in the integration of quasi-zero stiffness mechanisms with a rotational structure and high load-bearing capacity, addressing critical limitations of conventional vibration isolators. Finite element analysis (FEA) was employed alongside experimental testing to verify the unit's performance. Furthermore, experimental evaluations of a platform assembled from multiple units confirm the feasibility of constructing high-capacity vibration isolation systems. These findings underscore the potential of rotary QZS units for applications demanding effective vibration mitigation coupled with a high load-to-weight ratio. Future research will aim to further integrate these units into compact, multifunctional vibration isolation platforms. © 2025