Research on high-frequency dynamic models of rubber mounts with second-stage isolation
2022-01-0740
03/29/2022
- Content
- Rubber mount is a key component of the electric vehicle powertrain mount system, which can reduce the vibration transmitted from the powertrain to the body. The rubber mount with second-stage isolation means that a rubber vibration isolator is added to the metal bracket of the original rubber mount. Compared with the original rubber mount, the rubber mount with second-stage isolation has smaller dynamic stiffness and better vibration isolation performance in the high-frequency range. In this paper, the quasi-static characteristics of a rubber mount with second-stage isolation are tested, and the high-frequency dynamic characteristics of the rubber mount with second-stage isolation are calculated by the method of finite element simulation. According to its characteristics, an equivalent mechanical model including equivalent mass is established. The equivalent mechanical model is superimposed with the fractional derivative model and the Maxwell model to obtain two high-frequency dynamic models of rubber mount with second-stage isolation. Then, two identification methods (direct identification method and indirect identification method) for the unknown parameters of the high-frequency dynamic models are given, and the identification effects of the two identification methods are compared. Finally, two high-frequency dynamic models are used to calculate the high-frequency dynamic stiffness of the rubber mount with second-stage isolation. The result indicates that the two high-frequency dynamic models can accurately calculate the high-frequency dynamic stiffness of the rubber mount with second-stage isolation. They can be applied to the dynamic analysis of high-frequency vibration systems containing rubber mount with two-stage vibration isolation.
- Citation
- Zhang, J., and Liu PhD, X., "Research on high-frequency dynamic models of rubber mounts with second-stage isolation ," SAE Technical Paper 2022-01-0740, 2022, .