Probabilistic characterization and simulation of realistic particle shape based on sphere harmonic representation and Nataf transformation
Probabilistic characterization and simulation of realistic particle shape based on sphere harmonic representation and Nataf transformation
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基于球调和表示和 Nataf 变换的真实颗粒形状的概率表征和模拟
DOI：
10.1016/j.powtec.2019.10.007
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发表时间：
2020-01
影响因子：
5.2
通讯作者：
Zhang Ai-Jun
中科院分区：
文献类型：
--
作者：
Nie Jia-Yan;Li Dian-Qing;Cao Zi-Jun;Zhou Bo;Zhang Ai-Jun
基于X射线微计算机断层扫描（μCT）和图像处理的颗粒材料的颗粒形貌表征通常需要大量的成本、人力和时间。因此，只有一小部分颗粒可以被扫描，导致在表征实际颗粒形状时的不确定性。提出了一种基于球谐分析（SpherialHarmonic，SH）的沙粒形状概率表征和模拟方法，利用Nataf变换构造SH形状描述子的联合概率分布，并生成其随机样本用于虚拟粒子的重构。将该方法应用于表征和模拟莱顿·布扎德沙（LBS）的颗粒形状，并将模拟的颗粒作为离散元法的块体模板，以考虑真实颗粒形状的影响。结果表明，所提出的方法正确的特点和模拟的粒子形状的LBS的概率方式。
Significant commitment of cost, man power, and time are often required for characterizing particle morphology of granular materials based on X-ray micro-computed tomography (μCT) scanning and image processing. As a result, only a small portion of particles can be scanned, leading to uncertainty in characterizing realistic particle shape. This paper develops a probabilistic method to characterize and simulate sand particle shape based on Sphere Harmonic (SH) analysis, where Nataf transformation is used to construct the joint probability distribution of SH shape descriptors and to generate their random samples for reconstructing virtual particles. The proposed approach was applied to characterizing and simulating particle shapes of Leighton Buzzard sand (LBS), and these simulated particles were used as clump templates for discrete element method to account for effect of realistic particle shape. It was shown that the proposed approach properly characterizes and simulates the particle shape of LBS in a probabilistic manner.
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