滚动摩擦系数的测定及EDEM仿真分析
|
摘要
为方便且准确的测定物料滚动摩擦系数,通过对平抛运动装置的改进设定了一种测定物料滚动摩擦系数的方法.将所需测定物料打磨成球状,然后让其在半径为R的圆弧铁轨上成θ角处无初速度自由滚落,测定其自由停止时水平运动的距离及水平抛出点的高度,通过计算推导求得滚动摩擦系数。根据此参数在EDEM中建立安息角仿真模型,通过安息角试验测定与仿真结果对比验证仿真模型的准确性。结果表明:此方法所测定的滚动摩擦系数可以用来作为EDEM仿真参数的标定,此方法所测定的滚动摩擦系数是可行的。这为以后物料参数的标定提供了一定的理论基础。
In order to determine the rolling friction coefficient of the materials conveniently and accurately,a method for measuring the rolling friction coefficient of materials is set up with an improved flat polishing motion device. Polishing the materials which needed to be measured into a ball,then putting it on at an angle of θ in an arc track with the radius as the arc of R and let it free roll without initial velocity,measuring the distance of the horizontal movement and the height of the initial position.Set up a Repose angle simulation model in EDEM,comparing with the result of repose angle from experiment and simulation to verify the accuracy of the simulation model.The results shows that the error ratio between experimental dates and simulation results less than 3%,it is also a valuable method to test the rolling friction coefficient using the rolling friction coefficient from the experiment as the calibration of simulation parameters in EDEM. It provide a theoretical basis for the calibration of material parameters in the future.
In order to determine the rolling friction coefficient of the materials conveniently and accurately,a method for measuring the rolling friction coefficient of materials is set up with an improved flat polishing motion device. Polishing the materials which needed to be measured into a ball,then putting it on at an angle of θ in an arc track with the radius as the arc of R and let it free roll without initial velocity,measuring the distance of the horizontal movement and the height of the initial position.Set up a Repose angle simulation model in EDEM,comparing with the result of repose angle from experiment and simulation to verify the accuracy of the simulation model.The results shows that the error ratio between experimental dates and simulation results less than 3%,it is also a valuable method to test the rolling friction coefficient using the rolling friction coefficient from the experiment as the calibration of simulation parameters in EDEM. It provide a theoretical basis for the calibration of material parameters in the future.
引文
[1]SHI Q F,YAN X Q,HOU M Y.Experimental study of segregation patterns in binary granular mixtures under vertical vibration[J].Chinese Science Bulletin,2003,48(7):627-627.
[2]季顺迎.非均匀颗粒介质的类固-液相变行为及其本构模型[J].力学学报,2007,39(2):223-237.(Ji Shun-ying.Solid liquid phase transition behavior of heterogeneous granular media and its constitutive model Journal of mechanical model of[J].2007,39(2):223-237.)
[3]GENNES P G.Granular matter:A tentative view[J].Reviews of Modern Physics,1999,71(2):374-382.
[4]A.W.Roberts,Particle technology-reflections and horizons:an engineering perspective[J].Chemical Engineering Research and Design,1998,176(3):40-68.
[5]张民,姚珺,李明.种子休止角与静滑动摩擦系数测量仪[J].农业装备与车辆工程,2012:43-44.(Zhang Min,Yao Jun,Li Ming.Seed repose angle and static sliding friction coefficient measuring instrument[J].Agricultural Equipment and Vehicle Engineering,2012:43-44.)
[6]Contact parameter estimation for DEM simulation of iron ore pellet handling Gabriel K.P.Barriosa,Rodrigo M.de Carvalho a,Arno Kwadeb,Luís Marcelo Tavares a,2013.
[7]陈羽,李贝,蒋绍军.装载机铲斗满斗率测试中SPC方法的应用[J].工程机械,2014:14-18.(Chen Yu,Li Bei,Jiang Shao-jun.Application of loader bucket bucket rate test method in SPC[J].Construction Machinery,2014:14-18.)
[8]周骥.对松散矿石自然安息角的研究[J].有色金属,1986(2):25-27.(Zhou Ji.Research on the loose ore natural repose angle of[J].Nonferrous Metal,1986(2):25-27.)
[9]胡国明.颗粒系统的离散元素法系统仿真[M].武汉:武汉理工大学出版社,2008:10-11.(Hu Guo-ming.System Simulation of Discrete Element Method for Particle System[M].Wuhan:Wuhan Science University of Technology Press,2008:10-11.)
[10]LI Y,XU Y,THORNTON C.A comparison of discrete element simulations and experiments for‘sandpiles’composed of spherical particles[J].Powder Technology,2005(160):219-228.
[2]季顺迎.非均匀颗粒介质的类固-液相变行为及其本构模型[J].力学学报,2007,39(2):223-237.(Ji Shun-ying.Solid liquid phase transition behavior of heterogeneous granular media and its constitutive model Journal of mechanical model of[J].2007,39(2):223-237.)
[3]GENNES P G.Granular matter:A tentative view[J].Reviews of Modern Physics,1999,71(2):374-382.
[4]A.W.Roberts,Particle technology-reflections and horizons:an engineering perspective[J].Chemical Engineering Research and Design,1998,176(3):40-68.
[5]张民,姚珺,李明.种子休止角与静滑动摩擦系数测量仪[J].农业装备与车辆工程,2012:43-44.(Zhang Min,Yao Jun,Li Ming.Seed repose angle and static sliding friction coefficient measuring instrument[J].Agricultural Equipment and Vehicle Engineering,2012:43-44.)
[6]Contact parameter estimation for DEM simulation of iron ore pellet handling Gabriel K.P.Barriosa,Rodrigo M.de Carvalho a,Arno Kwadeb,Luís Marcelo Tavares a,2013.
[7]陈羽,李贝,蒋绍军.装载机铲斗满斗率测试中SPC方法的应用[J].工程机械,2014:14-18.(Chen Yu,Li Bei,Jiang Shao-jun.Application of loader bucket bucket rate test method in SPC[J].Construction Machinery,2014:14-18.)
[8]周骥.对松散矿石自然安息角的研究[J].有色金属,1986(2):25-27.(Zhou Ji.Research on the loose ore natural repose angle of[J].Nonferrous Metal,1986(2):25-27.)
[9]胡国明.颗粒系统的离散元素法系统仿真[M].武汉:武汉理工大学出版社,2008:10-11.(Hu Guo-ming.System Simulation of Discrete Element Method for Particle System[M].Wuhan:Wuhan Science University of Technology Press,2008:10-11.)
[10]LI Y,XU Y,THORNTON C.A comparison of discrete element simulations and experiments for‘sandpiles’composed of spherical particles[J].Powder Technology,2005(160):219-228.