Research on Damping Mechanism and Parameter Analysis of Particle Damper Based on Energy Theory

摘要

A mechanical model of a particle damper (PD) was established which has a friction effect between the damper particle and the damper cavity. PD parameters can have a significant effect on the particle damper's ability to control vibrations. These parameters include the coefficient of collision recovery between particle and cavity, the coefficient of rolling resistance between particle and cavity, and the particle radius, all of which affect the PD's damping mechanism and performance. To address this issue, the authors calculated the kinetic energy, elastic potential energy, damping energy, and input energy of a single-degree-of-freedom (SDOF) mechanical system with a PD. The computational analysis utilized the energy method and its development law. The results show that under the conditions studied, the damping effect of PD increases with the decrease of the coefficient of collision recovery and the increase of coefficient of rolling resistance, although the influence of particle radius can be neglected. The influence of PD and a tuned mass damper (TMD) on the damping effect was compared using the same parameters; the TMD had a better damping effect under resonance excitation, whereas the PD had a better damping effect under nonresonant excitation. The mechanical model of the PD constructed in this paper was verified by a shaking table test for a single-layer steel frame. The damping effect of PD is the result of the comprehensive influence of its parameters.