基于离散元法的玉米颗粒振动筛分过程模拟研究
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摘要
为了探究玉米颗粒在直线振动筛面上的运动情况,课题组以散体力学为基础,依据离散单元法分析玉米颗粒振动筛分机理。通过建立直线振动筛三维模型,分析玉米颗粒在振动筛面上的运动,应用可视化离散元模拟软件EDEM分析振动筛面在上下直线运动的情况下,玉米颗粒速度变化情况得出以玉米圆颗粒为基础模型,直线振动筛相关的一些参数的变化对筛分过程中颗粒速度和位置的影响。仿真结果表明:不同形状的筛孔、不同下落高度和不同形状颗粒都对筛分效果产生影响。课题组的研究为设计和优化直线振动筛提供了参考。
In order to explore the movement of corn particles on the linear vibrating screen,the vibration screening mechanism of corn granules was analyzed based on granule mechanics and the discrete element method EDEM was used.A three-dimensional model of a linear vibrating screen was established to investigate the movement of corn particles on the vibrating screen. The visual discrete element simulation software EDEM was used to analyze the up-and-down motion of the vibrating screen and the speed change of the corn particles. A model based on corn particles was established to study the influence of the parameters related to linear vibrating screen on particle velocity and position during the screening process. Simulation results show that different shapes of sieve holes,falling height and particles have an impact on the screening effect. The results provide a reference for the design and optimization of linear vibrating screen.
In order to explore the movement of corn particles on the linear vibrating screen,the vibration screening mechanism of corn granules was analyzed based on granule mechanics and the discrete element method EDEM was used.A three-dimensional model of a linear vibrating screen was established to investigate the movement of corn particles on the vibrating screen. The visual discrete element simulation software EDEM was used to analyze the up-and-down motion of the vibrating screen and the speed change of the corn particles. A model based on corn particles was established to study the influence of the parameters related to linear vibrating screen on particle velocity and position during the screening process. Simulation results show that different shapes of sieve holes,falling height and particles have an impact on the screening effect. The results provide a reference for the design and optimization of linear vibrating screen.
引文
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[2]陈进,周韩,赵湛,等.基于EDEM的振动种盘中水稻种群运动规律研究[J].农业机械学报,2011,42(10):79-83.
[3]伍毅,白晓丽,张双,等.基于离散元EDEM的碾米机内物料运动离散元分析研究[J].粮食加工,2018,43(2):52-54.
[4]王云霞,梁志杰,张东兴,等.基于离散元的玉米种子颗粒模型种间接触参数标定[J].农业工程学报,2016,32(22):36-42.
[5]马征,李耀明,徐立章,等.农业工程领域颗粒运动研究综述[J].农业机械学报,2013,44(2):22-29.
[6]SHI Song,ZHANG Dongxing,YANG Li,et al.Simulation and verification of seed-filling performance of pneumatic-combined holes maize precision seed-metering device based on EDEM[J].Transactions of the Chinese Society of Agricultural Engineering,2015,31(3):62-69.
[7]赵啦啦.振动筛分过程的三维离散元法模拟研究[D].徐州:中国矿业大学,2010:16-22.
[8]王晓梅.基于多球充填的玉米籽粒群体建模方法研究[D].长春:吉林大学,2017:52-56.
[9]CO?KUN M B,YALCIN I,?ZARSLAN C.Physical properties of sweet corn seed(zea mays saccharata Sturt.)[J].Journal of Food Engineering,2006,74(4):523-528.
[10]崔涛,刘佳,杨丽,等.基于高速摄像的玉米种子滚动摩擦特性试验与仿真[J].农业工程学报,2013,29(15):34-41.