Abstract
Dynamic stiffness and damping of vibration isolator are important parameters influencing the dynamic characteristics of the floating slab track. Based on the laboratory experiment of the steel spring vibration isolator, the paper analyzed frequency and amplitude dependent behavior of steel-spring vibration isolator. The results show that broadly the dynamic stiffness of the vibration isolator increases with the increase of excitation frequency, however, the dynamic stiffness decreases slightly near the resonant frequency; an increase of excitation frequency results in a decrease of the equivalent viscous damping coefficient with a small change near the resonant frequency; the energy dissipation ratio increases with the increase of excitation frequency; the dynamic stiffness, equivalent viscous damping coefficient and the energy dissipation ratio all have negligible variations as the excitation amplitude increases. The research results can provide references for the design of vibration isolators.
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