Keywords: rubber element, dynamic evolution, high-speed train, constitutive model, suspension system, coupled dynamics modeling.

Rubber elements are widely used to suspend underchassis equipment beneath high-speed trains' car body.The mechanical properties of rubber elements change significantly with ageing and temperature changes. This article is focused on the coupled dynamic modelling of the car body and underchassis equipment in high-speed vehicles considering the dynamic evolution characteristics of rubber elements. In combination with the experimental results, a mathematic model of the V-shaped rubber element dynamic evolution by combining the rubber viscoelastic constitutive model, the three-dimensional dynamic stiffness calculation method of the V-shaped rubber element and the Arrhenius equation is established. Utilizing the rigid-flexible coupled dynamics modeling approach, a coupled dynamic model of the car body and underchassis equipment considering the dynamic evolution of rubber components is established. The results indicated that when rubber elements are used between the car body and underchassis equipment, two first-order vertical bending modes are generated. Compared to currently commonly used dynamic models, the proposed coupled dynamics model considering the dynamic evolution of rubber components in this article can better account for the effects of temperature and aging time on dynamics.

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