Authors

Abstract

To address the lack of contact parameters for yanhusuo during the mechanization process, its basic physical and contact parameters were derived through both theoretical calculations and practical measurements. Utilizing 3D scanning technology, a 3D model of yanhusuo was obtained. A discrete element model was then established using an automatic filling method. The key factors influencing the stacking angle of yanhusuo were identified using Plackett-Burman tests. The optimal ranges for these factors were determined through the steepest ascent experiment, and a quadratic regression model for the stacking angle was developed using response surface methodology (RSM) based on a rotational orthogonal experimental design. The optimized parameters - a restitution coefficient of 0.481, static friction coefficient of 0.508, and rolling friction coefficient of 0.029 - yielded a stacking angle of 21.23°. Experimental validation showed a relative error of just 0.86% between the simulation and physical tests. These results demonstrate that the discrete element model and calibrated parameters closely replicate real-world conditions, providing valuable insights for the mechanical design of yanhusuo planting and harvesting equipment.

Abstract in Chinese

针对延胡索机械化过程中延胡索接触参数缺乏的问题，通过理论计算和实际测量，推导了延胡索的基本物理参数和接触参数。利用3D扫描技术，获得延胡索的3D模型。采用自动填充法建立延胡索离散元模型。通过 Plackett-Burman 试验确定了影响延胡索堆积角的重要因素。通过最陡上升试验确定了这些重要因素的最佳范围，并通过旋转正交实验设计的响应面法（RSM）建立了与这些因素相关的堆积角的二次回归模型。优化后的参数—恢复系数为0.481、静摩擦系数为0.508、滚动摩擦系数为0.029——产生的堆叠角为21.23°。实验验证显示模拟与实际测试之间的相对误差为0.86%。这些结果表明，离散元模型和校准参数密切复制了现实条件，为延胡索种植和收获的机械设计提供了宝贵的见解。