Authors

Abstract

To address the lack of contact parameters for seed ginger and the insufficient accuracy of existing discrete element models used in simulations of seed ginger machinery, a discrete element modeling and contact parameter calibration method for irregularly shaped seed ginger was proposed. A discrete element model of seed ginger was constructed using 3D laser scanning and an adaptive multi-sphere filling method. The contact parameters between seed ginger and steel were calibrated using free-fall collision tests, inclined-plane tests, and combined inclined-plane–horizontal-plane tests. Using the angle of repose as the response variable, the optimal parameter combination was determined through steepest ascent tests and response surface methodology. The relative error between the simulated angle of repose and the value measured in the bench test was 2.24%. The results provide a modeling basis for the optimization and design of key components of seed ginger machinery and for investigating the dynamic interaction mechanisms among seed ginger particles.

Abstract in Chinese

针对生姜播种机械在单粒取种与鳞芽调向仿真研究中姜种接触参数缺失、模型精度不足的问题，提出一种面向不规则块状姜种的离散元建模与接触参数标定方法。通过测定姜种基础物理力学参数，并基于三维激光扫描与多球自适应填充方法构建姜种离散元模型；采用自由落体碰撞法、斜面法及斜面-平面组合法标定姜种与钢材间接触参数；以休止角为响应指标，结合最陡爬坡试验与响应面试验，获得最优参数组合。研究结果可为生姜播种机械关键部件优化设计及颗粒群动态互作机理研究提供模型基础。