Research on dynamic characteristic analysis and parameter optimization design of metal-rubber vibration isolator

In this study, a novel metal-rubber hanger vibration isolator is proposed to enhance vibration isolation performance by utilizing the nonlinear hysteresis characteristics of metal-rubber. A hyperelastic–viscoelastic constitutive model capable of accurately simulating the static and dynamic mechanical behavior of metal-rubber was established by combining a three-parameter Mooney–Rivlin model with a Prony series. Finite element analysis shows that increasing the outer diameter and height of the metal-rubber block reduces the first natural frequency and vibration transmissibility of the isolator. In addition, the isolator exhibits significant frequency-dependent damping characteristics: energy dissipation decreases as the excitation frequency increases. This behavior ensures effective suppression of resonance in the low-frequency range while maintaining high isolation efficiency in the high-frequency range. Experimental validation confirms the accuracy of the developed hyperelastic–viscoelastic constitutive model and the established numerical model. These findings provide an important basis for the design of high-performance metal-rubber-based vibration isolators.