Rotary tiller is a widely used tillage tool in China, and its burial and mixing ability determine its performance. Discrete element method (DEM) is a promising numerical method to study the soil-tool interaction, and a suitable contact model is required to obtain a reasonable accuracy. In order to investigate the burial and mixing performance of a rotary tiller consisted of rotary blade and spiral horizontal blade in silty clay loam, two cohesion contact models HM-B and HM-JKR were compared. The sensitivity analysis for HM-B and HM-JKR were conducted by Plackett-Burman test. The bonding stiffness of HM-B and the surface energy of HM-JKR were the most sensitive parameters for their contact model, respectively, and were calibrated to compare their simulation performance. HM-JKR obtained a relatively smaller error on torque compared with measurement results in a soil bin test. The tillage characteristics of rotary blade and spiral horizontal blade were studied, and the effect of working conditions and rotary tiller structures on these were investigated by simulation. The distribution ratio and the disturbance intensity were selected to evaluate the burial and mixing performance. Compared with rotary blade, the spiral horizontal blade obtained a larger disturbance area and intensity. Tillage depth had the most significant effect on the tillage characteristics. The average disturbance intensity of rotary blade and spiral horizontal blade increased nearly 25% and 30% with the increase of tillage depth from 150 mm to 180 mm. The L-bend structure of the rotary blade was important to the burial and mixing performance of rotary tiller. A reasonable number of rotary blade group in the rotary tiller and distance between each rotary blade group can obtain a satisfied burial and mixing performance with a relative low torque consumption.

旋耕机是我国广泛使用的耕作工具，其埋藏和搅拌能力决定了其性能。离散元法 (DEM) 是一种很有前途的数值方法来研究土壤与工具的相互作用，需要合适的接触模型才能获得合理的精度。为研究旋耕机和螺旋水平叶片旋耕机在粉质黏壤土中的埋混性能，对HM-B和HM-JKR两种粘聚接触模型进行了比较。HM-B 和 HM-JKR 的敏感性分析采用 Plackett-Burman 检验。HM-B 的结合刚度和 HM-JKR 的表面能分别是其接触模型中最敏感的参数，并进行了校准以比较它们的模拟性能。与土仓测试中的测量结果相比，HM-JKR 获得的扭矩误差相对较小。研究了旋耕机和螺旋水平叶片的耕作特性，并通过仿真研究了工作条件和旋耕机结构对其的影响。选择分配比和扰动强度来评价掩埋和混合性能。与旋转叶片相比，螺旋水平叶片获得了更大的扰动面积和强度。耕作深度对耕作特性的影响最为显着。随着耕深从150 mm增加到180 mm，旋转叶片和螺旋水平叶片的平均扰动强度分别增加了近25%和30%。这 研究了旋耕机和螺旋水平叶片的耕作特性，并通过仿真研究了工作条件和旋耕机结构对其的影响。选择分配比和扰动强度来评价掩埋和混合性能。与旋转叶片相比，螺旋水平叶片获得了更大的扰动面积和强度。耕作深度对耕作特性的影响最为显着。随着耕深从150 mm增加到180 mm，旋转叶片和螺旋水平叶片的平均扰动强度分别增加了近25%和30%。这 研究了旋耕机和螺旋水平叶片的耕作特性，并通过仿真研究了工作条件和旋耕机结构对其的影响。选择分配比和扰动强度来评价掩埋和混合性能。与旋转叶片相比，螺旋水平叶片获得了更大的扰动面积和强度。耕作深度对耕作特性的影响最为显着。随着耕深从150 mm增加到180 mm，旋转叶片和螺旋水平叶片的平均扰动强度分别增加了近25%和30%。这 选择分配比和扰动强度来评价掩埋和混合性能。与旋转叶片相比，螺旋水平叶片获得了更大的扰动面积和强度。耕作深度对耕作特性的影响最为显着。随着耕深从150 mm增加到180 mm，旋转叶片和螺旋水平叶片的平均扰动强度分别增加了近25%和30%。这 选择分配比和扰动强度来评价掩埋和混合性能。与旋转叶片相比，螺旋水平叶片获得了更大的扰动面积和强度。耕作深度对耕作特性的影响最为显着。随着耕深从150 mm增加到180 mm，旋转叶片和螺旋水平叶片的平均扰动强度分别增加了近25%和30%。这 随着耕深从150 mm增加到180 mm，旋转叶片和螺旋水平叶片的平均扰动强度分别增加了近25%和30%。这 随着耕深从150 mm增加到180 mm，旋转叶片和螺旋水平叶片的平均扰动强度分别增加了近25%和30%。这旋耕机叶片的L型弯结构对旋耕机的埋藏和搅拌性能有重要影响。旋耕机中合理的旋翼组数量和各旋翼组之间的距离，能够以较低的扭矩消耗获得满意的掩埋和搅拌性能。