Abstract:

In order to absorb the vibration from the flywheel, a nonlinear energy sink (NES) is presented in this paper. The NES is composed of a linear spring and the parallel Euler buckled beams. A discrete multi-degree-of-freedom dynamic model, including the flywheel, the NES and the supporting structure is built. The systematic dynamic equations under the transient and steady loadings, respectively, are solved by fourth-order Runge-Kutta method. Based on these calculating results, it is shown that the NES exhibits the efficiency of energy transfer from the linear system, which includes the supporting structure and the flywheel, to the NES. Meanwhile, the targeted energy transfer has been excited. Then, a detailed computational research of the different types of nonlinear energy transitions that occur under the three-level inputting energy is provided. As a result of these studies, the medium-level exciting energy leads to the effective targeted energy transfer from the linear system to the NES. Under this condition, it exhibits that apparent responses of the NES in a wider frequency range. According to the calculating results under the experimental data from the flywheel, it can be concluded that the NES has suppressed the influences from the disturbance of the flywheel effectively.

Key words: Nonlinear energy sink, Euler buckled beam, Flywheel, Vibration suppression