Reproducibility of the repose angle, porosity, and coordination number of particles generated by spherical harmonic-based principal component analysis using discrete element simulation
Reproducibility of the repose angle, porosity, and coordination number of particles generated by spherical harmonic-based principal component analysis using discrete element simulation
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DOI：
10.1016/j.powtec.2022.118143
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发表时间：
2022-12
影响因子：
5.2
通讯作者：
T. Ueda
中科院分区：
文献类型：
--
作者：
T. Ueda
采矿和制造业中的大多数原材料都处于颗粒状态，因此它们的体积特性（例如休止角）是我们感兴趣的。采用离散元法（DEM）模拟了大量颗粒的这些特性。由于DEM模拟的粒子数量众多，而粒子形状又会影响颗粒的体积特性，因此需要对真实粒子形状进行有效的建模。基于球面谐波的主成分分析（SH-PCA）被用于随机生成保留原始粒子形态特征的粒子形状。以往的研究证实，SH-PCA生成的颗粒中再现了原始颗粒的形态特征，但对相关体积性质的研究较少。本研究利用x射线计算机断层扫描获得4种矿石颗粒形态并进行分析，利用SH-PCA生成新的颗粒形态，利用生成的颗粒形态与原始颗粒形态进行DEM模拟的体性质（休养角、孔隙度、配位数）对比，证实了复制的成功。进一步的DEM模拟，包括由原始颗粒形状类型的副本组成的颗粒系统，显示需要从200到1100种形状变化来重现所有不同形状颗粒系统的体积特性，这表明颗粒形状变化的重要性。
Most of the raw material in the mining and manufacturing industries is in a granular state, and its bulk properties (e.g., repose angle) are thus of interest. Discrete element method (DEM) simulation of numerous particles is used to determine these properties. As numerous particles are simulated by DEM, and particle shapes affect the bulk properties, the effective modeling of realistic particle shapes is required. Spherical harmonic-based principal component analysis (SH-PCA) has been used to randomly generate particle shapes that retain the original particles' morphological features. Previous studies confirmed that the morphological features of original particles were reproduced in particles generated by SH-PCA, but there have been few studies on the related bulk properties. In this study, the shapes of four types of ore particles were obtained by X-ray computed tomography and analyzed, new particle shapes were generated by SH-PCA, the bulk properties (repose angle, porosity, and coordination number) simulated by DEM using the generated particle shapes were compared with those using the original particle shapes, successful reproduction was confirmed. A further DEM simulations, involving particle systems composed of copies of original particle-shape types, revealed that from 200 to 1100 shape varieties were required to reproduce the bulk properties of all the differently-shaped particle systems, suggesting the importance of particle-shape variety.