带颗粒减振剂的碰撞阻尼的理论与实验

以两颗粒弹塑性碰撞耗能模型为基础,建立了带颗粒夹击的两球碰撞模型,在此基础上提出了带颗粒减振剂的碰撞阻尼的计算模型,模拟了在带颗粒减振剂的碰撞阻尼作用下的悬臂梁的减振性能.同时对悬臂梁在带颗粒减振剂的碰撞阻尼作用下的减振效果进行实验研究,理论计算结果与实验结果在振动周期、转折点、振幅及共振点迁移等方面均相吻合,验证了提出的模型.得到了以下结论:①带颗粒减振剂的碰撞阻尼的计算模型是可靠的;②带颗粒减振剂的碰撞阻尼具有优秀的减振性能,远远超过单体碰撞阻尼;③带颗粒减振剂的碰撞阻尼对于减小负阻尼的不利影响具有一定的帮助.

Theoretical and experimental research on impact damping with fine particles as damping agent

Based on the mechanical model of elastic-plastic impact between two spheres,the energy absorption ability of two spheres covered by fine particles during elastic-plastic impact process was predicted,the analysis model of the impact damper with fine particles as damping agent (IDFPDA) was built and the damping performance of a cantilevered beam vibration with IDFPDA was simulated.Experimental studies on the cantilevered beam with IDFPDA were also performed,and the results were in good agreement with the theoretical predictions in vibration period,transition point,amplitude response and resonance transfer,which validated the mechanical models proposed.The following conclusions were drawn through the numerical and experimental studies on the IDFPDA:(1) the analysis model of the IDFPDA proposed is reliable;(2) the IDFPDA has good performance in energy dissipation,which is better than single mass impact damper;(3) the IDFPDA is helpful to alleviate the adverse effects of negative damping.