Modeling and analysis of hydraulic bushings/mounts considering frequency and amplitude dependence
2022-01-0327
03/29/2022
- Content
- The dynamic characteristics of hydraulic bushings/hydraulic mounts are related to their excitation amplitude and frequency, which are often not reflected in existing models. Based on the lumped parameter model of hydraulic bushings/mounts, this paper compares and analyzes the similarity of the working mechanism of hydraulic bushings and hydraulic mounts, and deduces the unified mechanical analog model. Based on the derived unified mechanical analog model, a nonlinear damping element is introduced at the concentrated mass of the liquid in the pipe to reflect the amplitude dependence of the resonance of the hydraulic bushings/mounts dynamic stiffness curve.At the same time, Maxwell element and Berg friction damping element are introduced at the equivalent spring element representing the upper chamber stiffness, so as to reflect the amplitude dependence of the dynamic stiffness curve of the hydraulic bushings/mounts in high frequency band caused by the nonlinear stiffness of the upper chamber spring. Finally, from the perspectives of frequency domain and time domain, the improved mechanical analog model proposed in this paper is compared with "Kelvin-Voigt model", traditional mechanical analog model and experimental results. The results show that: the proposed model this paper can not only be applied to hydraulic bushings and hydraulic mounts at the same time, but also can reflect the amplitude dependence of its dynamic characteristics. Compared with other models, the proposed model has higher fitting accuracy.
- Citation
- jiang, j., Yin, Z., and Shangguan, W., "Modeling and analysis of hydraulic bushings/mounts considering frequency and amplitude dependence ," SAE Technical Paper 2022-01-0327, 2022, .