应用符号距离场的不规则颗粒离散元数值方法  

Irregular Particle Discrete Element Method with Signed Distance Field Approach

作　　者：杨校宇 温童歌 曾祥远[1] Yang Xiaoyu;Wen Tongge;Zeng Xiangyuan(School of Automation,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]北京理工大学自动化学院,北京100081

出　　处：《动力学与控制学报》2024年第11期1-9,共9页Journal of Dynamics and Control

基　　金：国家自然科学基金优秀青年基金(12222202)。

摘　　要：提出了一种利用符号距离场(Signed Distance Field,SDF)检测颗粒间接触的不规则颗粒离散元仿真方法,用于分析不规则颗粒系统的动力学行为.不规则颗粒的接触检测是关键难点,论文粗检测阶段通过均匀网格法检索邻居颗粒;精细接触检测则应用SDF隐式函数描述颗粒的不规则外形,对颗粒表面生成的体素网格符号距离进行线性插值,高效提取颗粒间接触特征信息.利用颗粒塌落数值仿真与地面实验等工况的对比分析,验证了所提方法的有效性.An irregular discrete element simulation method using signed distance field(SDF)to detect the contact between particles is proposed to analyze the dynamic behavior of irregular particle systems.The contact detection of irregular particles is the key difficulty.In the coarse detection stage,the neighbor particles were retrieved by the spatial sorting method.In fine contact detection,the SDF implicit function is used to describe the irregular shape of the particles,and the signed distance of the voxel grid generated on the surface of the particles is linearly interpolated to extract the contact characteristics of the particles efficiently.The effectiveness of the proposed method is verified by the comparison between numerical simulation and experiment of particle collapse.

关 键 词：不规则颗粒 离散元法 符号距离场 接触检测 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]