基于EDEM仿真的有机肥深施机施肥控制系统的设计

针对林果园不同地块土壤肥力不均,林果在各生长阶段对有机肥需求量不同等问题,对有机肥深施机施肥控制系统进行设计。采用离散元仿真软件EDEM对施肥转盘旋转角度与施肥流量进行仿真,并进行线性拟合。结合机器行进速度、单位面积理论施肥量、施肥转盘旋转角度与施肥流量等因素,设计有机肥深施机施肥控制系统,主要包括测速模块、主程序模块(速度、施肥量、脉冲转换模块)、中断模块和液晶显示模块。室内施肥试验结果表明:当单位面积理论施肥量分别为7 500、9 750和11 250kg/hm~2时,实际施肥量分别为7 532.46、9 836.82和11042.28kg/hm~2,施肥变异系数CV分别为1.1%、1.3%和1.9%,施肥一致性良好。田间试验结果表明:该有机肥深施机施肥均匀,无断流现象,达到设计要求。本研究所设计的有机肥深施机施肥控制系统满足林果园有机肥深施的农艺要求,可以进行林果园有机肥深施作业。

Design of fertilization control system based on EDEM simulation for deep application of organic fertilizer

In order to solve the problems of uneven soil fertility in different plots and different demands for organic fertilizer at different growth stages, one organic fertilizer application machine was designed in this study. Discrete element simulation software EDEM was used to simulate the rotation angle of the fertilizer rotary table and the discharge rate, and fitted the results by combining machine running speed, the theory of fertilization amount per unit area, fertilizer mechanism rotation angle and fertilizer flow and other factors were combined in the new machine. This machine included the main program module, speed measurement module (speed, fertilization rate, and pulse conversion module), interrupt module and liquid crystal display module. The results of indoor experiment showed that:When the theory fertilization amount per unit area were 7 500, 9 750 and 11 250 kg/hm², respectively, the actual amount of fertilizer were 7 532.46, 9 836.82 and 11 042.28 kg/hm², respectively. The coefficient of variation of CV fertilizer was 1.1%, 1.3% and 1.9% displaying good consistency. The results of field experiment showed that:The fertilizer was uniform and there was no-flow phenomenon. All the results meet the design requirements. This machine can meet the agronomic requirements of deep application of organic fertilizer, and can be used for the deep application of organic fertilizer.