复合振动下谷物茎秆分离的离散元模拟研究
Discrete Element Simulation of Grain Stalk Separation under Compound Vibration
杨华瑞 1马学东 1宋梅雪 1王晓川 1赵轩瑾1
作者信息
- 1. 辽宁科技大学 机械工程与自动化学院,辽宁 鞍山 114000
- 折叠
摘要
为了探究复合振动下农作物颗粒的运动行为和偏析效果,实现谷物茎秆的机械化分离,使用SolidWorks软件建立几何模型,运用离散元软件(EDEM)进行仿真计算.设置生成谷物质量 100 g,茎秆质量 2.5 g,施加复合振动(由频率为6 Hz、相位差为 0、振幅为 20 mm和 10 mm的水平和竖直直线振动合成),仿真总时间为 10 s,并引入谷物质量分数来量化分层质量.模拟结果表明:容器中的谷物和茎秆在竖直方向上呈现出明显的分层状态,且分层后未出现返混现象.颗粒在复合振动的激励下,分化成抛起和沿容器壁滑动两部分;在整个分层过程中谷物处于主导地位,谷物的平均动能是茎秆的 6 892 倍,两者动能差异是分层的主要原因;在仿真进行到2.85 s时,谷物和茎秆基本上完成了分离工作,分层后谷物质量分数达 99.73%.设置水平和竖直直线振动对比实验,结果表明:复合振动在破坏颗粒力链和提高颗粒流动性方面都有明显优势.
Abstract
In order to investigate the motion behavior and segregation effect of agricultural grains under composite vibra-tion,and achieve mechanized separation of grain stalks,a geometric model was established using solidworks software,and simulation calculations were performed using discrete element software(EDEM).The generated grain mass of 100 g and stalk mass of 2.5 g were set,and the composite vibration(synthesized by horizontal and vertical linear vibration with fre-quency of 6 Hz,phase difference of 0,amplitude of 20 mm and 10 mm)was applied,and the total simulation time was 10 s,and the grain mass fraction was introduced to quantify the stratified mass.The analysis results showed that the grains and stalks in the container showed obvious stratification in the vertical direction,and there was no re-mixing phe-nomenon after stratification.The grains were divided into two parts:throwing up and sliding along the container wall un-der the excitation of compound vibration;the grains were in the dominant position during the whole vibration process,and the average kinetic energy of the grains was 6 892 times that of the stalks,and the difference in kinetic energy between the two was the main reason for stratification.In the simulation to 2.85 s,the separation of grain and stalk was basically completed,the grain mass fraction reached 99.73%.The horizontal and vertical linear vibration verification tests were set up,and it was found that the compound vibration had obvious advantages in breaking the particle force chain and im-proving the particle fluidity.
关键词
偏析分层/复合振动/离散单元法/颗粒动能/谷物茎秆Key words
segregation stratification/compound vibration/discrete element method/particle kinetic energy/grain stalk引用本文复制引用
出版年
2025
国家科技期刊平台
NSTL
万方数据