Abstract To build an analysis model of maize seed particles using the discrete element method, the shape, size, density and moisture content of maize seed particles are measured and analysed. It can be seen that within the same variety of maize seed particles, the shape can be classified into horse-tooth, spherical-cone, spheroid, prism, and irregular shape. The percentage of horse-tooth, spherical-cone, and spheroid particles accounts for approximately 90% of the total. The characteristic size of the horse-tooth, spherical-cone, and spheroid particles approximately obey a normal distribution, and there is a certain functional relationship between the sizes. For the same variety of maize seed assemblies, the horse-tooth, spherical-cone, and spheroid particles are selected to build the analysis model. The upper size of the horse-tooth particle and the thickness of the spheroid particle are chosen as the primary sizes and are randomly generated according to their normal distribution. The other characteristic sizes are calculated via their corresponding functional relationships. An analysis model of individual maize seed particles is built using the multi-sphere (MS) method. Taking three varieties of maize seeds as examples in this paper, the results show that the simulated results are close to those obtained experimentally in terms of the piling and “self-flow screening” tests when the horse-tooth, spherical-cone, and spheroid particles are filled with 10 to 14, 18, and 6 sub-spheres, respectively. A preliminary verification is performed of the feasibility and validity of the modelling method of maize seed particle assemblies and individual maize seed particles.

中文翻译：

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基于离散元法的玉米种子组装建模方法及验证

摘要 为建立玉米种子颗粒的离散元分析模型，对玉米种子颗粒的形状、大小、密度和水分含量进行了测量和分析。可见，在同一品种的玉米种子颗粒中，其形状可分为马齿形、球锥形、类球体、棱柱形和不规则形。马齿状、球锥状和球状颗粒的百分比约占总数的 90%。马齿状、球锥状和类球状颗粒的特征尺寸近似服从正态分布，尺寸之间存在一定的函数关系。对于相同种类的玉米种子组件，选择马齿、球锥和球体颗粒来构建分析模型。选择马齿状粒子的上尺寸和球体粒子的厚度作为主要尺寸，并根据它们的正态分布随机生成。其他特征尺寸通过其对应的函数关系计算。使用多球 (MS) 方法建立了单个玉米种子颗粒的分析模型。本文以3个品种的玉米种子为例，结果表明，在马齿、球锥、球体的堆积和“自流筛选”试验方面，模拟结果与实验得到的结果接近。粒子分别填充了 10 到 14、18 和 6 个子球。