Discrete Element Simulation of Grain Stalk Separation under Compound Vibration
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.
segregation stratificationcompound vibrationdiscrete element methodparticle kinetic energygrain stalk
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