Authors

Abstract

To improve the accuracy of discrete elemental simulation parameters for tiger nut seeds, this study suggests the measurement of the triaxial dimensions of tiger nut seeds using MATLAB. This method proves exhibiting a maximum error of no more than 0.16% compared to the traditional measurement techniques. Experimental measurements were used to obtain the basic physical parameters of the seeds. Physical tests on the angle of stacking of tiger nut seeds were conducted. A discrete meta-model for tiger nut seeds was constructed. The Plackett-Burman test and the steepest climb test were used to identify critical parameters affecting the angle of accretion and to delineate the optimal range of parameters impacting larger parameters proportionately. The optimum values for the coefficient of static and rolling friction between tiger nut seeds were established at 0.32 and 0.24, respectively, using response surface methodology. The average tangent of the simulated stacking angle obtained was 0.731 in three tests were carried out using the optimised parameters, representing a mere 0.41% deviation from the physical test average of 0.734. The experimental outcomes confirm that these parameters can provide reliable data for discrete meta-simulation experiments involving tiger nut seeds.

Abstract in Chinese

为提高油莎豆种子离散元模拟参数的准确性，本研究提出使用 MATLAB 测量油莎豆种子的三轴尺寸。事实证明，与传统测量技术相比，该方法的最大误差不超过 0.16%。试验测量用于获得种子的基本物理参数。对油莎豆种子的堆积角进行了物理测试。构建了油莎豆种子的离散元模型。利用Plackett-Burman试验和最陡爬坡试验确定了影响堆积角的关键参数，并划定了影响较大参数比例的最佳参数范围。利用响应面方法确定了油莎豆种子间静摩擦系数和滚动摩擦系数的最佳值，分别为 0.32 和 0.24。在使用优化参数进行的三次试验中，模拟堆积角的平均正切值为 0.731，与物理试验的平均值 0.734 相比，偏差仅为 0.41%。试验结果证实，这些参数可为有关油莎豆种子的离散元模拟试验提供可靠数据。