微重力下颗粒阻尼特性仿真研究  

Simulation study on micro-gravity behavior of particle dampers

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,江苏南京210016

出　　处：《振动工程学报》2013年第2期232-238,共7页Journal of Vibration Engineering

基　　金：江苏省普通高校研究生科研创新计划资助项目(CXLX11-0179)

摘　　要：利用离散元法通过三维仿真研究阻尼颗粒在失重环境中的运动特点以及不同因素对其阻尼性能的影响,并提出了一种提高阻尼器在失重条件下耗能能力的方法。仿真结果表明:当阻尼器填充率较低或振动水平较小时,重力加速度对于阻尼器的耗能效果具有显著影响;当阻尼器处于零重力环境时,只有在大填充率或较高振动水平的情况下,阻尼器才能充分发挥阻尼效果,否则颗粒会形成一个松散的颗粒团悬浮于容器中央,这一特性为微重力环境下所特有。针对以上特点,为了提高颗粒阻尼器在低填充率和小振幅下的耗能能力,在阻尼器内部引入了一种颗粒扰动器。结果表明扰动器的安装可以明显提高阻尼器的耗能能力。In this paper, three-dimensional simulation study on motion behaviors of damping particles in microgravity or zero- gravity environments and the influences of different factors on its damping performances are carried out using discrete element method （DEM）. And a kind of method for enhancing dissipative capacity of the damper in zero gravity environments was pro- posed. Simulation results show that gravity has a significant effect on damping performance of particle damper. And the damp- ing particles in zero-gravity environments have a reasonable damping performance only when the particle container is almost fully filled with particles or has large displacement amplitude, otherwise the particles will be getting together and forming a floating cluster in the middle of the container. To break the floating cluster for driving the particles into motion, a cross-shaped spoiler is introduced and fitted inside the container, which greatly raises the damping performance in zero-gravity environ- ments.

关 键 词：颗粒阻尼 微重力 太空结构振动控制 离散单元法 

分 类 号：O323[理学—一般力学与力学基础] TB53[理学—力学]