基于粉体力学模型的颗粒阻尼研究
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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.
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.
引文
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[10]段勇,陈前,周宏伟.垂直简谐激励下颗粒阻尼耗能特性的仿真研究[J].振动与冲击,2009,28(2):28-31.DUAN Yong,CHEN Qian,ZHOU Hong-hai.Simulation investigation on particle damping for its characteristic of loss power under vertical excitation[J].Journal of Vibration and Shock,2009,28(2):28-31.
[11]Liu W,Tomlinson G R,Rongong J A.The dynamic characterisation of disk geometry particle dampers[J].Journal of Sound and Vibration,2005,280(3-5):849-861.
[12]胡溧,黄其柏,柳占新,等.颗粒阻尼的动态特性研究[J].振动与冲击,2009,28(1):134-137.HU Li,HUANG Qi-bai,LIU Zhan-xin,et al.Dynamic characterstics of particle dampers[J].Journal of Vibration and Shock,2009,28(1):134-137.
[13]谢洪勇,刘志军.粉体力学与工程[M].北京:化学工业出版社,2007.
[2]Panossian H V.Structural damping enhancement via non obstructive particle damping technique[J].Journal of Vibration and Acoustics,American Society of Mechanical Engineers,1992,114(1):101-105.
[3]Marhadi K S,Kinra V K.Particle impact damping:effect of mass ratio,material,and shape[J].Journal of Sound and Vibration,2005,283(1-2):433-448.
[4]江泽辉,刘新影,彭雅晶,等.竖直振动颗粒床中的倍周期运动[J].物理学报,2005,54(12):5692-5698.JIANG Ze-hui,LIU Xin-ying,PENG Ya-jing,et al.Period doubling motion in vertically vibrated granular beds[J].Acta Physica Sinica,2005,54(12):5692-5698.
[5]毛宽民,陈天宁,黄协清.非阻塞性颗粒阻尼的散体元模型[J].西安交通大学学报,1999,33(5):79-83.MAO Kuan-min,CHEN Tian-ning,HUANG Xie-qing.Discrete element method applied to non-obstructive particle damping[J].Journal of Xi'an Jiaotong University,1999,33(5):79-83.
[6]Chen T,Mao K,Huang X,et a1.Dissipation mechanisms of non-obstructive particle damping using discrete element method[J].Proceedings of SPIE International Symposium on Smart Structures and Materials,2001,433:294-301.
[7]Saeki M.Analytical study of multi-particle damping[J].Journal of Sound and Vibration,2005,281(3-5):1133-1144.
[8]Wong C X,Daniel M C,Rongong J A.Energy dissipation prediction of particle dampers[J].Journal of Sound and Vibration,2009,319(1-2):91-118.
[9]Hassanpour A,Tan H,Bayly A,et al.Analysis of particle motion in a paddle mixer using discrete element method(DEM)[J].Powder Technology,2011,206(1-2):189-194.
[10]段勇,陈前,周宏伟.垂直简谐激励下颗粒阻尼耗能特性的仿真研究[J].振动与冲击,2009,28(2):28-31.DUAN Yong,CHEN Qian,ZHOU Hong-hai.Simulation investigation on particle damping for its characteristic of loss power under vertical excitation[J].Journal of Vibration and Shock,2009,28(2):28-31.
[11]Liu W,Tomlinson G R,Rongong J A.The dynamic characterisation of disk geometry particle dampers[J].Journal of Sound and Vibration,2005,280(3-5):849-861.
[12]胡溧,黄其柏,柳占新,等.颗粒阻尼的动态特性研究[J].振动与冲击,2009,28(1):134-137.HU Li,HUANG Qi-bai,LIU Zhan-xin,et al.Dynamic characterstics of particle dampers[J].Journal of Vibration and Shock,2009,28(1):134-137.
[13]谢洪勇,刘志军.粉体力学与工程[M].北京:化学工业出版社,2007.