Nonlinear Dynamic Modeling and Analysis of Flywheel-dry Friction Damping Ring under Base Excitation

doi:10.3901/JME.260418

Abstract

Abstract: The theoretical researches are carried out to predict the responses of the flywheel equipped with the dry friction damping ring and analyze the dynamic behaviors of the friction interfaces. A high-dimensional nonlinear dynamic model of the flywheel-damping ring system with multiple friction interfaces under the base random excitation is established. The number of DOF of the high-dimensional nonlinear system is reduced by using the modes of the linear system, and the vibration equations of the reduced-DOF system are solved by using the Duhamel integral, the detailed local dynamic behaviors of the friction interfaces are obtained. The dynamic responses of the flywheel under the base random excitation are predicted and compared with the experimental results, which show that the acceleration responses and acceleration response power spectral density (PSD) of the rim and bearing are basically consistent with the experimental results at the peaks, indicating that the established high-dimensional nonlinear dynamic model can accurately predict the vibration response of the flywheel. The ratio of the total time when the friction interface is in slip state to the total time of duration of the random excitation is defined as the overall slip ratio of the friction interface, which is shown to be in the range of 40%-100%. It is found that there is a corresponding relationship between the overall slip ratio and the normal load, i.e., the larger the normal load, the smaller the overall slip ratio; the smaller the normal load, the larger the overall slip ratio. The established nonlinear dynamic model can quickly and accurately predict the response of the flywheel-damping ring system, which can be used to guide the design of the flywheel damping ring.

Key words: flywheel, dry friction damping ring, nonlinear, friction, dynamics

CLC Number:

TG156

WANG Sen, HE Xiaodong, HUANG Xiuchang, ZHOU Huajun, ZHANG Ziwei, WANG Yong, WEI Xinsheng. Nonlinear Dynamic Modeling and Analysis of Flywheel-dry Friction Damping Ring under Base Excitation[J]. Journal of Mechanical Engineering, 2026, 62(9): 228-237.

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