陈超鹏,全伟,吴明亮,张文韬.基于离散元法的油菜移栽垂直入土式成孔部件参数优化[J].湖南农业大学学报:自然科学版,2019,45(4):.
基于离散元法的油菜移栽垂直入土式成孔部件参数优化
  
DOI:
中文关键词:  油菜  移栽机  锥刺  离散元法  参数优化
英文关键词:rapeseed  transplanter  cone  discrete element method  parameters optimization
基金项目:国家科技支撑计划项目(2014BAD11B03);湖南省科学技术厅重点项目(2017NK2131)
作者单位
陈超鹏,全伟,吴明亮,张文韬 1.湖南农业大学工学院湖南 长沙 4101282.湖南农业大学东方科技学院湖南 长沙4101283.湖南省现代农业装备工程技术研究中心湖南 长沙 410128 
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中文摘要:
      针对南方稻田前茬秸秆存量多、土壤黏重导致油菜移栽机成孔部件作业阻力大、孔穴形态不稳定的问题,对自主研制的履带式油菜苗移栽栽植孔成型机构的锥刺直径、锥尖倒角、入土深度进行单因素、多因素离散元仿真试验。结果显示:成孔部件的锥刺直径、锥尖倒角、入土深度对锥刺入土的有效深度及入土阻力有显著影响,且存在显著的交互作用;多因素仿真试验的最优参数为锥刺直径52 mm、锥尖倒角40°、入土深度86.30 mm。对最优参数得到的锥刺进行EDEM仿真和室内土槽对比试验,结果EDEM仿真与土槽试验锥刺入土阻力变化趋势一致,孔形有效深度分别为55.4 mm和56.6 mm,误差率为2.1%;锥刺入土阻力分别为57.5 N和54.7 N,误差率为4.9%。
英文摘要:
      Aiming at the problems of high penetration resistance of hole-forming parts for rapeseed transplanter and unstable shape of transplanting hole under rice field with large amount of previous stubble and high soil viscosity in southern China, the cone diameter, the cone tip chamfering angle and the soil penetration depth of the hole-forming parts were optimized by single-factor and multi-factor simulation test based on discrete element method for the self-developed crawler transplanter. The results showed that the cone diameter, the cone tip chamfering angle and the soil penetration depth of the hole-forming parts had an significant influences on the effective depth and the penetration resistance resistance. Optimal parameter combination was the cone diameter of 52 mm, the cone tip chamfering angle of 40°, the soil penetration depth of 86.30 mm by multi-factor EDEM simulation test. Soil bin tests were carried out to verify the optimal parameter combination for hole-forming. It is showed that EDEM simulations were consistent with variation trend of penetration resistance of hole in soil bin tests. The effective depth of hole was 55.4 mm and 56.6mmwith an error of 2.1% and the penetration resistance of hole was 57.5 N and 54.7 N, with an error of 4.9%, for EDEM simulation and soil bin test, respectively.
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