Authors

Abstract

For the problem of lacking reliable values of soil parameters required for dynamic simulation analysis of soil under high-speed tillage, no-tillage soil was taken as the research object and its parameters were calibrated using the discrete element method in this study. The Edinburgh Elasto-Plastic Adhesion (EEPA) model was determined as the soil contact model by obtaining the loading force-deformation relationship through uniaxial sealing compression tests. The regression equation was established using Plackett-Burman test and quadratic orthogonal rotation test, and the interaction effects were analyzed. The measured values of the pile angle and strain were obtained through the pile angle test and the uniaxial seal compression test, and the optimal solution was carried out. Further, the simulated values and the measured values under the optimal parameters were compared and verified, the result showed that the error values were all less than 1%. Finally, the soil model was used for high-speed tillage simulation analysis, and the obtained soil particle displacement and groove width were compared with the measured values. It was found that the ditch width error value was 3.04% and the soil displacement was basically the same. This study proved that the contact model parameters were relatively reliable, which could provide theoretical reference for the dynamic characteristics of soil during high-speed cultivation of no-tillage soil.

Abstract in Chinese

针对进行高速耕作土壤动态仿真分析时所需土壤参数缺乏可靠性数值的问题，本研究以免耕土壤为研究对象，采用离散元方法对免耕土壤进行参数标定。通过单轴密封压缩试验获取加载力-变形量的关系确定 Edinburgh Elasto-Plastic Adhesion（EEPA）模型为土壤接触模型；利用Plackett-Burman试验和二次正交旋转试验建立回归方程，并进行交互效应的分析；通过堆积角试验和单轴密封压缩试验获取堆积角和应变的实测值并进行最优求解，将最优参数下的仿真值和实测值进行对比验证，发现误差值均小于1%。最后以该土壤模型进行高速耕作仿真分析，将获取的土壤颗粒位移量和沟槽宽度与实测值进行对比，发现沟槽宽度误差值为3.04%，土壤位移量基本一致。研究证明了接触模型参数较为可靠，可为免耕土壤高速耕作过程中土壤的动态特性提供理论参考。