| 颗粒流程序(PFC~(2D))中阻尼参数的适用性研究 |
| |
| 引用本文： | 周国庆,周杰,陆勇,李亭.颗粒流程序(PFC~(2D))中阻尼参数的适用性研究[J].中国矿业大学学报,2011(5). |
| |
| 作者姓名： | 周国庆 周杰 陆勇 李亭 |
| |
| 作者单位： | 中国矿业大学深部岩土力学与地下工程国家重点实验室;重庆交通大学土木建筑学院;中国矿业大学力学与建筑工程学院; |
| |
| 基金项目： | 国家自然科学基金重点项目(50534040,50974117) |
| |
| 摘 要： | 为克服离散元-二维颗粒流(PFC2D)程序中阻尼参数选取的任意性,通过悬臂梁的剪弯受力(静态问题)和钢球自由下落-碰撞-反弹(动态问题)的PFC2D模拟,明确了PFC2D中局部阻尼和黏性阻尼的定义及适用范围.结果表明:静态问题可采用局部阻尼,以缩短获得稳定解的计算时间;动态问题则需采用有物理意义的局部阻尼或黏性阻尼,由钢球自由下落-碰撞-反弹PFC2D试验可知,钢球的法向黏性阻尼比为ζ=0.16.阻尼所消耗的能量(阻尼能)是一种微观能量,其变化规律反映了阻尼的作用机理,其发挥方式决定了数值模型获得稳定解的计算时间和计算结果的合理性.因此,只有选取合理的阻尼参数,才能获得与理论或实验室试验结果相吻合的颗粒流PFC2D模拟结果.
|
| 关 键 词： | 二维颗粒流程序(PFC2D) 阻尼参数 阻尼能 静态问题 动态问题 |
Selection of damping parameters usedin a particle flow code(PFC~(2D)) |
| |
| ZHOU Guo-qing,ZHOU Jie,LU Yong,LI Ting.Selection of damping parameters usedin a particle flow code(PFC~(2D))[J].Journal of China University of Mining & Technology,2011(5). |
| |
| Authors: | ZHOU Guo-qing ZHOU Jie LU Yong LI Ting |
| |
| Affiliation: | ZHOU Guo-qing1,ZHOU Jie2,LU Yong1,3,LI Ting 1(1.State Key Laboratory for Geomechanics & Deep Underground Engineering,China University of Mining & Technology,Xuzhou,Jiangsu 221008,China,2.School of Civil Engineering and Architecture,Chongqing Jiaotong University,Chongqing 400074,3.School of Mechanics and Civil Engineering,Jiangsu 221116,) |
| |
| Abstract: | Simulations of a cantilever beam subject to combined action of shear-bending(a static problem) and rebound of a falling steel ball(a dynamic problem) were simulated by the particle flow code in 2-dimension(PFC2D,a discrete element software),these two numerical simulations help to understand the selection principle and the influence law of damping parameters.The results show that local damping has no physical meaning and may be used in static or quasi-static problems to efficiently obtain the steady state so... |
| |
| Keywords: | PFC2D damping parameters damping energy static problem dynamic problem |
| 本文献已被 CNKI 等数据库收录！ |
|
