Authors

Abstract

To address the lack of contact parameters in designing hazelnut harvesting machinery, this study measured the physical properties of hazelnuts through experiments and obtained a 3D model via scanning. A DEM model was established accordingly. Contact parameters between hazelnuts and steel were calibrated through physical and simulated tests, yielding a restitution coefficient of 0.31, static friction of 0.39, and rolling friction of 0.04. Using the relative error of repose angle as the response variable and hazelnut–hazelnut contact parameters as factors, a quadratic regression model was developed by steepest ascent and Central Composite tests. The optimal contact parameters of hazelnuts were 0.11 (restitution), 0.21 (static friction), and 0.04 (rolling friction), with a 1.84% error.

Abstract in Chinese

为解决设计，优化榛子收获机械中缺乏接触参数的问题，本文通过试验测试得到了它的基本物理参数。通过3D技术得到了榛子的三维模型并建立了DEM模型。通过物理及模拟接触参数试验，测量及校准了榛子与钢的接触参数：恢复率0.31，静摩擦率0.39，滚动摩擦率0.04。以物理与模拟堆积角的相对误差为响应值，以榛子间的接触参数为影响因子，通过最陡爬坡试验及中心组合试验建立二次回归模型，通过求解方程得到榛子间的最佳接触参数组合为：恢复系数0.11，静摩擦系数0.21，滚动摩擦系数0.04，相对误差为1.84%。