基于EDEM的内充式花生排种器排种过程的离散元仿真研究

Discrete Element Simulation Study of Seed Metering Process of Inside-Filling Meter Based on EDEM

[目的]寻找排种器的最佳排种转速。[方法]建立内充式花生排种器的离散元仿真模型，采用离散元的基本原理，运用EDEM软件对内充式花生排种器排种性能进行仿真研究，测定3种不同品种的花生种子在不同转速时排种器的排种量、清种起始角及清种终止角的变化趋势。[结果]实际转速为15.7-45.5 r/min时排种量随着转速的增大而增加，但与花生的品种无关；清种起始角和终止角也均随转速的增大而增大，但起始角的增大幅度大于终止角，导致清种区域随转速的增大而减小，实际转速为38.0 r/min时双粒率达到最高值、排种均匀性最好，仿真结果与试验结果变化趋势一致。[结论]基于EDEM的离散元仿真方法分析内充式花生排种器是可行的。

[Objective] To find the optimal meter rotational speed of seed metering. [Method] Discrete element simulation model was established for the Inside-Filling Meter. EDEM software was used for simulation study on seed metering property of inside-filling meter. Change trends of seed metering amount,seed-clearing starting angle,and seed-clearing ending angle of three varieties of peanut seeds were detected in different rotate speeds. [Result] When the rotate speed was 15. 7-45. 5 r/min,seed metering amount enhanced as the rotate speed increased,but had no corre-lation with peanut varieties. Seed starting angle and ending angle enhanced as the rotate speed increased,but the increase amplitude of starting an-gle was greater than that of ending angle,which led to the decrease of cleaning area with the increase of rotate speed. When the rotate speed was 38. 0 r/min,double grain rate reached the maximum value,and the uniformity of seed metering was the optimal. Change trend of simulation result was consistent with that of experimental results. [ Conclusion] It is feasible to analyze the inside-filling meter by discrete element simulation based on EDEM.