基于离散元法的凸圆刃式深松铲减阻效果仿真分析与试验  

Simulation analysis and experiment of drag reduction effect of convex blade subsoiler based on discrete element method

作　　者：马跃进[1] 王安[1] 赵建国[1] 郝建军[1] 李建昌[1] 马璐萍[1] 赵伟博 吴月 Wang An;Zhao Jianguo;Hao Jianjun;Li Jianchang;Ma Luping;Zhao Weibo;Wu Yue(College of Mechanical and Electrical Engineering,Hebei Agricultural University,Baoding 071001,China)

机构地区：[1]河北农业大学机电工程学院,保定071001

出　　处：《农业工程学报》2019年第3期16-23,共8页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家"十三五"科技支撑重大项目粮食丰产增效科技创新(2017YFD0300907)

摘　　要：针对深松作业阻力大、能耗高等问题,该文在深松铲铲尖顶部设计了一种能有效减阻降耗的凸圆刃。以安装凸圆刃的凸圆刃式深松铲为研究对象,建立了土壤模型。为提高土壤模型的准确性,选用非线性粘结弹性塑形接触模型(edinburgh elasto-plastic adhesion model,EEPA),对凸圆刃式深松铲进行耕作阻力虚拟仿真。利用插件将颗粒与深松铲接触作用力导出,分析凸圆刃式深松铲应力和形变,校验其结构强度;采用EDEM软件分析不同耕深和速度对深松耕作阻力的影响,并以国标深松铲为比较对象,分析了凸圆刃式深松铲的减阻效果;通过田间试验验证了土壤模型和凸圆刃式深松铲设计的准确性和可行性。田间试验结果表明,与国标深松铲相比,凸圆刃式深松铲耕作阻力平均降低了10.24%。仿真结果与实测值较为接近,数值误差在3%～10%,证明土壤模型基本符合土壤的力学特性,能近似代替真实的土壤环境。该研究证明了采用离散元法分析深松耕作阻力可行性,可为进一步优化深松铲结构提供参考。Due to long-term shallow ploughing,rotary tillage and tractor wheel rolling,a hard and compact Plow pan layer is formed between the tillage layer and the subsoil layer.The presence of plow pan layer can inhibit roots growing and prevent material transfer between tillage layer and the susoil layer,thus reducing crop yield.The subsoiling can improve the soil water storage,improve soil water retention capacity,promote roots growth,and effectively improve crop yield effectively,but the resistance and energy consumption of subsoiling is high.The convex blade subsoiler was designed to reduce the subsoiling resistance in the paper.The convex blade subsoiler was mainly composed of subsoiler handle,subsoiler tip and convex edge,in the process of subsoiling,the convex edge on the subsoiler tip slip cutting the soil on the upper surface of the subsoiler tip,which reducing the pressure of the soil on the upper surface of the subsoiler tip,thereby reducing the subsoiling resistance.Firstly,the curve expression of convex blade edge was calculated based on the sliding cutting condition.And then,the convex blade subsoiler with convex blade and stander subsoiler were selected as the study object by EDEM simulation and field experiment,which used to verify the drag reduction effect of convex blade and the accuracy of soil simulation model.Taking North China Plain as the research object,the physical parameters of soil particle was determined,and the soil geometry model which consists of tillage layer,the subsoil layer and plow pan layer was constructed by 3D graphics software NVENTOR.In order to improve the accuracy of the soil model,the Edinburgh Elasto-Plastic Adhesion Model was used as soil contact model to simulate the tillage resistance of subsoiler.The EDEM software was employed to analyze the drag reduction effect of convex blade subsoiler at different tillage depths and forward speeds,which had been compared with the stander subsoiler.The experiment results showed that convex blade subsoiler had a drag reduction effect comp

关 键 词：农业机械 离散元法 深松 试验 凸圆刃 耕作阻力 

分 类 号：S222.129[农业科学—农业机械化工程]