稻麦精准变量施肥机排肥性能分析与试验

发布时间：2018-03-16 08:26

本文选题：变量施肥　切入点：外槽轮　出处：《农业机械学报》2017年07期 　论文类型：期刊论文

【摘要】：为提高基于近地光谱技术的稻麦精准变量施肥机排肥性能稳定性,改善变量施肥控制精度,建立了外槽轮式变量施肥机离散元仿真模型,运用离散单元法和EDEM 2.2软件对施肥机排肥过程进行性能分析和数值模拟,研究不同排肥器结构和施肥控制策略对施肥机排肥稳定性的影响,并通过台架试验和田间试验验证仿真模型的准确性。结果表明:改进后的排肥器施肥量变异性系数明显减小,标准差减小14.59 g,变异系数降低9.9%;采用转速优先控制策略,当槽轮开度为19.34 mm时,排肥量稳定性系数最佳为1.09%;采用开度优先控制策略,当槽轮转速为55.75 r/min时,排肥量变异性系数最小为1.85%;与验证试验结果相比,误差最大为14.06%。结果验证了离散元仿真方法分析颗粒运动过程的准确性,表明所设计改进的排肥器能够提高施肥机排肥稳定性,满足稻麦精准变量施肥要求。
[Abstract]:In order to improve the performance stability of precision variable-rate fertilization machine based on near-earth spectrum technology and improve the precision of variable rate fertilization control, a discrete element simulation model of external grooved wheeled variable-rate fertilization machine was established. Using discrete element method and EDEM 2.2 software, the performance analysis and numerical simulation of fertilizer discharging process were carried out, and the effects of different fertilizer discharging device structures and fertilization control strategies on the fertilizer efflux stability of fertilization machine were studied. The accuracy of the simulation model was verified by bench test and field experiment. The results showed that the coefficient of variation, standard deviation and coefficient of variation of the improved fertiliser decreased obviously, 14.59 g and 9.9% respectively, and the rotational speed priority control strategy was adopted. When the slot wheel opening is 19.34 mm, the best stability coefficient of fertilizer discharge is 1.09, and the minimum coefficient of variation is 1.85 when the slot wheel speed is 55.75 r / min. The maximum error is 14.060.The results verify the accuracy of the discrete element simulation method to analyze the particle motion process. The results show that the improved fertiliser can improve the stability of fertilizing machine and meet the requirement of precise variable rate fertilization of rice and wheat.
【作者单位】：南京农业大学工学院;农业部南京农业机械化研究所;江苏省现代设施农业技术与装备工程实验室;
【基金】：国家重点研发计划项目(2016YFD0200602-4) “十二五”国家科技支撑计划项目(2013BAD08B04-8) 江苏省普通高校研究生科研创新计划项目(KYLX16_1017)
【分类号】：S224.2

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