基于粉体力学模型的颗粒阻尼研究  

Behavior of particle dampers based on a micromeritic model

作　　者：姚冰[1] 陈前[1] 

机构地区：[1]南京航空航天大学机械结构力学及控制国家重点实验室,南京210016

出　　处：《振动与冲击》2013年第22期7-12,共6页Journal of Vibration and Shock

基　　金：中央高校基本科研业务费专项资金资助;江苏省普通高校研究生科研创新计划资助项目(CXLX11_0179);国家自然基金资助项目(11272145)

摘　　要：利用颗粒阻尼粉体力学模型,建立激励水平与被激活颗粒间理论关系,并与颗粒阻尼DEM仿真结合,研究圆柱形颗粒阻尼器结构尺寸及不同方向激励(水平、竖直)对阻尼器耗能特性影响。研究发现,所建理论模型能较好预测颗粒阻尼进入工作状态所需振动水平;圆柱形颗粒阻尼器受轴向激励时,在填充相同数量颗粒前提下内径大的阻尼器中颗粒层全部进入液体及气体状态所需约化加速度更小,更易发挥阻尼效果;相同强度水平下,竖直激励使阻尼器能产生更好的阻尼效果。Here, a micromeritic model was established to investigate the behavior of cylindrical particle dampers, and simulations were performed using the discrete element method （DEM） to study the effects of their geometric sizes and excitations in different directions （vertical and horizontal） on the characteristics of particle dampers. The study results showed that when the dampers packed with the same amount of particles are excited vertically, the bigger the inner diameter of the dampers, the more easily the particles do convert from solid state to fluid and gas ; when the vibration level is lower, the damper with a larger diameter has a better energy dissipation performance; the damper excited vertically can dissipate more energy than it excited horizontally can under the same vibration level.

关 键 词：颗粒阻尼 粉体力学 约化加速度 离散单元法 DISCRETE ELEMENT method (DEM) 

分 类 号：O323[理学—一般力学与力学基础] TB53[理学—力学]