In the field of low-frequency vibration isolation,aiming at the issues of insufficient bearing capacity of linear system and stiffness hardening and instability caused by nonlinear jump of traditional quasi-zero stiffness vibration isolation system,a mechani-cal model of the bionic limb-like quasi-zero stiffness isolation system was established by using the bionic limb-like structure as the negative stiffness element and the positive stiffness spring in parallel.The static characteristics of the system were analyzed;A dy-namic model was established based on the Lagrangian equations,and the harmonic balance method was used to analyze the dynam-ics equations of the system analytically;Through theoretical analysis and experimental research,the isolation characteristics of lin-ear and traditional quasi-zero stiffness isolation system and bionic limb quasi-zero stiffness isolation system were compared and ana-lyzed,as well as the influence of excitation amplitude on the isolation performance and stability characteristics of the system.The results show that compared with the linear system and the traditional quasi-zero stiffness isolation system,the bionic limb-like qua-si-zero stiffness isolation system not only ensures the system has a higher bearing capacity,but also effectively reduces the displace-ment transmissibility and expands the vibration isolation through the design of structural parameters.The frequency bandwidth im-proves the stability and vibration isolation performance of the system in complex excitation environments.
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