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颗粒离散元模拟中的阻尼系数标定
引用本文:钟文镇,何克晶,周照耀,夏伟,李元元.颗粒离散元模拟中的阻尼系数标定[J].物理学报,2009,58(8):5155-5161.
作者姓名:钟文镇  何克晶  周照耀  夏伟  李元元
作者单位:(1)华南理工大学机械与汽车工程学院,广州 510641; (2)华南理工大学计算机科学与工程学院,广州 510641
基金项目:国家重点基础研究发展计划(批准号:2007CB616905)、国家自然科学基金(批准号:10805019)和广东省自然科学基金(批准号: 8451064101000083)资助的课题.
摘    要:离散元模型中所采用的阻尼系数是不确定的,经常凭主观经验设定.为了使得物理模型与现实中的颗粒动力学属性符合更好,通过采用声频采样技术对物理模型中的阻尼系数进行标定,得出与实验符合的阻尼系数应为0.5左右.利用标定后的阻尼系数模拟了一元颗粒在圆柱形容器里的随机堆积过程,得到最终的堆积密度为0.625,与经典的实验结果一致.研究证明,在得到模型阻尼系数的同时,也确认了数值模型的正确性和用声频采样技术进行高精度碰撞时间检测的可行性. 关键词: 颗粒堆积 阻尼系数标定 声频采样 离散元法

关 键 词:颗粒堆积  阻尼系数标定  声频采样  离散元法
收稿时间:2008-09-22

Calibration of damping coefficient in discrete element method simulation
Zhong Wen-Zhen,He Ke-Jing,Zhou Zhao-Yao,Xia Wei,Li Yuan-Yuan.Calibration of damping coefficient in discrete element method simulation[J].Acta Physica Sinica,2009,58(8):5155-5161.
Authors:Zhong Wen-Zhen  He Ke-Jing  Zhou Zhao-Yao  Xia Wei  Li Yuan-Yuan
Abstract:In the discrete element method, the damping coefficient, which is a key parameter for rational simulation, is uncertain and often chosen based on researchers experience. To make the physical model reflect the reality better, in this paper acoustic technology is used to calibrate the damping coefficient. Oscillogram of the acoustic wave generated by the collisions is analyzed and the calibrated damping coefficient is obtained to be 0.5. The calibrated parameters are used to simulate the random packing process of 2000 monosize spherical particles. The final packing density is 0.625, which is in accordance with the classic measurements quite well. Besides the obtained correct damping coefficient, in this paper both the usefulness of the physical model and the practicability of acoustic technology for detecting the collision time are also demonstrated precisely.
Keywords:random particle packing  calibration of damping coefficient  acoustic analysis  discrete element method
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