Abstract: In order to solve the problem that it is difficult to accurately estimate the dynamic stiffness of rubber isolator under high-frequency excitation. The quasi-static characteristics and dynamic characteristics of a rubber isolator under high-frequency excitation are tested and analyzed. First, the traditional rubber constitutive models are used to simulate the high-frequency dynamic characteristics of the rubber isolator. In addition, the disadventages of the traditional rubber dynamic models in high-frequency simulation are explained. Then an equivalent mechanical model of the rubber isolator with equivalent masses is proposed, which is combined with traditional rubber dynamic models (such as Maxwell model, fractional derivative model, and fractional derivative Maxwell model) to obtain three improved rubber dynamic models. The three improved dynamic models are used in low-middle frequency and high-frequency simulations, and the simulation results are compared with the measured dynamic stiffness. The results show that three improved dynamic models can accurately calculate the dynamic stiffness of the rubber isolator under low-middle frequency excitation. Under high-frequency excitation, the simulation of the three models using the segmentation method can also reflect the trend of the dynamic stiffness of the rubber isolator, and the relative errors are small. These improved dynamic models can be applied to the dynamic analysis of high-frequency vibration systems with rubber isolators.

Rubber isolator,High-frequency excitation,Dynamic stiffness,Improved dynamic models