Abstract

The main objective of this study is to calibrate Discrete Element Modeling (DEM) input parameters for Vietnamese DT84 variety soybeans. For this purpose, the shape of the soybeans was firstly analyzed through digital images (captured by an imaging platform), which enabled the deviation of the shape of particles compared to a sphere through shape indicators to be quantified. Secondly, the physical characteristics of the soybeans (size distribution and gravimetric properties) and the coefficient of static friction between particles and material surfaces were measured by experimentation. The rest of the DEM input parameters were calibrated by combining selected particle flow experiments and corresponding DEM simulations, including bulk density cylinder, silo discharge and inclined cylinder. The final set of DEM input parameters was compared with previous research in the literature for other varieties of soybeans, showing strong correlation. This study proves that: (i) spherical particles can be used to model DT84 soybeans in DEM simulations and (ii) the equivalent diameter of the grains obtained from image analysis can be employed to approximate particle weight. The DEM input parameters of soybean obtained from this work could help enhance the design and development of seeders, by exploring the contact behavior between particle flow and machine parts.

摘要

本研究的主要目的是校准越南 DT84 品种大豆的离散元建模 (DEM) 输入参数。为此，首先通过数字图像（由成像平台捕获）分析大豆的形状，通过形状指标量化颗粒形状与球体相比的偏差。其次，通过实验测量大豆的物理特性（粒度分布和重量特性）以及颗粒与材料表面之间的静摩擦系数。其余的 DEM 输入参数通过结合选定的粒子流实验和相应的 DEM 模拟进行校准，包括体积密度圆柱、筒仓排放和倾斜圆柱。最终的 DEM 输入参数集与其他大豆品种的文献中先前的研究进行了比较，显示出很强的相关性。本研究证明：(i) 球形颗粒可用于在 DEM 模拟中模拟 DT84 大豆；(ii) 从图像分析中获得的颗粒的等效直径可用于近似颗粒重量。通过探索粒子流与机器部件之间的接触行为，从这项工作中获得的大豆 DEM 输入参数有助于增强播种机的设计和开发。(i) 球形颗粒可用于在 DEM 模拟中模拟 DT84 大豆；(ii) 从图像分析中获得的颗粒的等效直径可用于近似颗粒重量。通过探索粒子流与机器部件之间的接触行为，从这项工作中获得的大豆 DEM 输入参数有助于增强播种机的设计和开发。(i) 球形颗粒可用于在 DEM 模拟中模拟 DT84 大豆；(ii) 从图像分析中获得的颗粒的等效直径可用于近似颗粒重量。通过探索粒子流与机器部件之间的接触行为，从这项工作中获得的大豆 DEM 输入参数有助于增强播种机的设计和开发。