Quasi-Zero Stiffness Magnetic Vibration Absorber

A magnetic-enhanced nonlinear energy sink with quasi-zero stiffness (QZS-ME-NES) is proposed, which mainly focuses on the influence of linear stiffness on vibration reduction. Quasi-zero stiffness is generally used in the field of vibration isolation. In terms of vibration absorption, it is inevitable that there is linear stiffness in nonlinear stiffness. Based on the magnetic force expression of permanent magnet, the dynamic equations of the linear oscillator (LO) equipped with the novel NES are established. Its dynamic characteristics are analyzed by numerical and approximate analytical solutions. The transient response and steady-state response of the LO equipped with the NES are studied. Moreover, the vibration attenuation performance of the novel NES is compared with that of the triple-magnet magnetic suspension dynamic vibration absorber (TMSDVA). The results show that the novel NES not only has the ability of adaptive broadband vibration suppression, but also significantly enhances the vibration attenuation of LO. In summary, the proposed NES is a reliable and effective vibration attenuation strategy.