量杯式计量精度离散元法仿真研究  

DEM Simulation Study on the Accuracy of Measuring Cup Filling

作　　者：段能全[1] 王俊元[1] 高永宏[1] 杜文华[1] 王文涛[1] 

机构地区：[1]中北大学,太原030051

出　　处：《包装工程》2014年第5期73-78,共6页Packaging Engineering

摘　　要：目的探讨离散元法在预估量杯式计量精度中的应用。方法通过分析计量过程中小米颗粒的运动及能量损耗形式,构建具有质量阻尼和刚度阻尼的颗粒接触模型,并对照实测休止角(34.9°),利用此模型试算反演诸如阻尼比等颗粒的细观参数。在量杯规格为26 mm×17 mm、充填速度为150mm/s的条件下,仿真计算每个充填周期中从料斗迁移出的颗粒数目变化(用以表征计量精度),对实验和仿真数据作对比分析。结果仿真休止角为34.7°,与实测值吻合较好。在显著性水平为0.05时,仿真与实验计量精度无明显不同。结论离散元法可用于量杯式计量的分析研究。Objective To investigate the application of the discrete element method （DEM） in the accuracy estimation of measuring cup filling. Methods Based on the characteristics of motion and energy dissipation of the millet grains in the process of packaging, the contact model was constructed, in which mass dashpots and stiffness dashpots were specified. Based on the model and the experimental angle of repose （34.9°） , the micro-parameters, e.g. damping ratio, were investigated and as- signed. The changes in the number of particles migrated from the hopper in each packaging cycle were calculated by the model and regarded as characterization of measuring accuracy, where the size of cup and packaging speed were 26 mm×17 mm and 150 mm/s, respectively. The data of the experiment and the simulation were compared. Results The simulative angle of repose was 34.7 ° , well fitted to the experimental result. At the 0.05 level, the distribution of accuracy was not significantly different between the experiment and the simulation. Conclusion It was proved that DEM can be used to investigate measuring cup fill- ing, in addition, construction of the model and choice of parameters were reasonable.

关 键 词：量杯式计量 离散元法 计量精度 颗粒 休止角 

分 类 号：TB486[一般工业技术—包装工程] TB24